Internet-Draft JOSE HPKE PQ February 2026
Skokan & Campbell Expires 14 August 2026 [Page]
Workgroup:
Javascript Object Signing and Encryption
Internet-Draft:
draft-skokan-jose-hpke-pq-pqt-latest
Published:
Intended Status:
Standards Track
Expires:
Authors:
F. Skokan
Okta
B. Campbell
Ping Identity

JOSE HPKE PQ & PQ/T Algorithm Registrations

Abstract

This document registers Post-Quantum (PQ) and Post-Quantum/Traditional (PQ/T) hybrid algorithm identifiers for use with JSON Object Signing and Encryption (JOSE), building on the Hybrid Public Key Encryption (HPKE) framework.

About This Document

This note is to be removed before publishing as an RFC.

The latest revision of this draft can be found at https://panva.github.io/jose-hpke-pq-pqt/draft-skokan-jose-hpke-pq-pqt.html. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-skokan-jose-hpke-pq-pqt/.

Discussion of this document takes place on the Javascript Object Signing and Encryption Working Group mailing list (mailto:jose@ietf.org), which is archived at https://mailarchive.ietf.org/arch/browse/jose/. Subscribe at https://www.ietf.org/mailman/listinfo/jose/.

Source for this draft and an issue tracker can be found at https://github.com/panva/jose-hpke-pq-pqt.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 14 August 2026.

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Table of Contents

1. Introduction

[I-D.ietf-jose-hpke-encrypt] defines how to use Hybrid Public Key Encryption (HPKE) with JSON Web Encryption (JWE) using traditional Key Encapsulation Mechanisms (KEM) based on Elliptic-curve Diffie-Hellman (ECDH).

This document extends the set of registered HPKE algorithms to include Post-Quantum (PQ) and Post-Quantum/Traditional (PQ/T) hybrid KEMs, as defined in [I-D.ietf-hpke-pq]. These algorithms provide protection against attacks by cryptographically relevant quantum computers.

The term “PQ/T hybrid” is used here consistent with [I-D.ietf-hpke-pq] to denote a combination of post-quantum and traditional algorithms, and should not be confused with HPKE's use of "hybrid" to describe the combination of asymmetric and symmetric encryption.

2. Conventions and Definitions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.

3. Algorithm Identifiers

This section defines the algorithm identifiers for PQ and PQ/T HPKE-based encryption in JOSE. Each algorithm is defined by a combination of an HPKE KEM, a Key Derivation Function (KDF), and an Authenticated Encryption with Associated Data (AEAD) algorithm.

All algorithms defined in this section follow the same operational model as those in [I-D.ietf-jose-hpke-encrypt], supporting both integrated encryption as defined in Section 5 of [I-D.ietf-jose-hpke-encrypt] and key encryption as defined in Section 6 of [I-D.ietf-jose-hpke-encrypt].

Test vectors for all algorithms defined in this section are provided in Appendix A.

3.1. PQ/T Hybrid Integrated Encryption Algorithms

The following table lists the algorithm identifiers for PQ/T hybrid integrated encryption, where HPKE directly encrypts the plaintext without a separate Content Encryption Key:

Table 1: PQ/T Hybrid Integrated Encryption Algorithms
"alg" value HPKE KEM HPKE KDF HPKE AEAD
HPKE-8 MLKEM768-P256 (0x0050) SHAKE128 (0x0010) AES-128-GCM (0x0001)
HPKE-9 MLKEM768-X25519 (0x647a) SHAKE128 (0x0010) AES-128-GCM (0x0001)
HPKE-10 MLKEM1024-P384 (0x0051) SHAKE256 (0x0011) AES-256-GCM (0x0002)

These algorithms combine ML-KEM with a traditional elliptic curve algorithm in a PQ/T hybrid KEM construction, with the goal that compromise of either the post-quantum or the traditional component alone does not undermine the security of the resulting encryption.

3.2. Pure PQ Integrated Encryption Algorithms

The following table lists the algorithm identifiers for pure post-quantum integrated encryption:

Table 2: Pure PQ Integrated Encryption Algorithms
"alg" value HPKE KEM HPKE KDF HPKE AEAD
HPKE-11 ML-KEM-768 (0x0041) SHAKE256 (0x0011) AES-256-GCM (0x0002)
HPKE-12 ML-KEM-1024 (0x0042) SHAKE256 (0x0011) AES-256-GCM (0x0002)

These algorithms provide pure post-quantum security using ML-KEM without a traditional algorithm component.

3.3. PQ/T Hybrid Key Encryption Algorithms

The following table lists the algorithm identifiers for PQ/T hybrid key encryption, where HPKE encrypts the Content Encryption Key:

Table 3: PQ/T Hybrid Key Encryption Algorithms
"alg" value HPKE KEM HPKE KDF HPKE AEAD
HPKE-8-KE MLKEM768-P256 (0x0050) SHAKE128 (0x0010) AES-128-GCM (0x0001)
HPKE-9-KE MLKEM768-X25519 (0x647a) SHAKE128 (0x0010) AES-128-GCM (0x0001)
HPKE-10-KE MLKEM1024-P384 (0x0051) SHAKE256 (0x0011) AES-256-GCM (0x0002)

These are the key encryption counterparts of the PQ/T hybrid integrated encryption algorithms defined in Table 1.

3.4. Pure PQ Key Encryption Algorithms

The following table lists the algorithm identifiers for pure post-quantum key encryption:

Table 4: Pure PQ Key Encryption Algorithms
"alg" value HPKE KEM HPKE KDF HPKE AEAD
HPKE-11-KE ML-KEM-768 (0x0041) SHAKE256 (0x0011) AES-256-GCM (0x0002)
HPKE-12-KE ML-KEM-1024 (0x0042) SHAKE256 (0x0011) AES-256-GCM (0x0002)

These are the key encryption counterparts of the pure PQ integrated encryption algorithms defined in Table 2.

4. JSON Web Key Representation

Keys for the algorithms defined in this document use the "AKP" (Algorithm Key Pair) key type defined in [I-D.ietf-cose-dilithium].

For the algorithms in this document, the "pub" parameter contains the base64url encoding of HPKE's SerializePublicKey() output for the corresponding KEM, and the "priv" parameter contains the base64url encoding of HPKE's SerializePrivateKey() output.

Examples of JWKs for each algorithm are provided in Appendix A.

5. Security Considerations

The security considerations of [I-D.ietf-jose-hpke-encrypt] and [I-D.ietf-hpke-pq] apply to this document.

This document does not register algorithms using ML-KEM-512. As noted in Section 3 of [I-D.ietf-hpke-pq], given the relative novelty of ML-KEM, there is concern that new cryptanalysis might reduce the security level of ML-KEM-512. Use of ML-KEM-768 or ML-KEM-1024 acts as a hedge against such cryptanalysis at a modest performance penalty.

6. IANA Considerations

6.1. JSON Web Signature and Encryption Algorithms Registry

This document requests registration of the following values in the IANA "JSON Web Signature and Encryption Algorithms" registry established by [RFC7518]:

6.1.1. HPKE-8

  • Algorithm Name: HPKE-8

  • Algorithm Description: Integrated Encryption with HPKE using MLKEM768-P256 KEM, SHAKE128 KDF, and AES-128-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 1 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.2. HPKE-8-KE

  • Algorithm Name: HPKE-8-KE

  • Algorithm Description: Key Encryption with HPKE using MLKEM768-P256 KEM, SHAKE128 KDF, and AES-128-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 3 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.3. HPKE-9

  • Algorithm Name: HPKE-9

  • Algorithm Description: Integrated Encryption with HPKE using MLKEM768-X25519 KEM, SHAKE128 KDF, and AES-128-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 1 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.4. HPKE-9-KE

  • Algorithm Name: HPKE-9-KE

  • Algorithm Description: Key Encryption with HPKE using MLKEM768-X25519 KEM, SHAKE128 KDF, and AES-128-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 3 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.5. HPKE-10

  • Algorithm Name: HPKE-10

  • Algorithm Description: Integrated Encryption with HPKE using MLKEM1024-P384 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 1 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.6. HPKE-10-KE

  • Algorithm Name: HPKE-10-KE

  • Algorithm Description: Key Encryption with HPKE using MLKEM1024-P384 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 3 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.7. HPKE-11

  • Algorithm Name: HPKE-11

  • Algorithm Description: Integrated Encryption with HPKE using ML-KEM-768 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 2 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.8. HPKE-11-KE

  • Algorithm Name: HPKE-11-KE

  • Algorithm Description: Key Encryption with HPKE using ML-KEM-768 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 4 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.9. HPKE-12

  • Algorithm Name: HPKE-12

  • Algorithm Description: Integrated Encryption with HPKE using ML-KEM-1024 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 2 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

6.1.10. HPKE-12-KE

  • Algorithm Name: HPKE-12-KE

  • Algorithm Description: Key Encryption with HPKE using ML-KEM-1024 KEM, SHAKE256 KDF, and AES-256-GCM AEAD

  • Algorithm Usage Location(s): "alg"

  • JOSE Implementation Requirements: Optional

  • Change Controller: IETF

  • Specification Document(s): Table 4 of this document

  • Algorithm Analysis Document(s): [I-D.ietf-hpke-pq]

7. References

7.1. Normative References

[I-D.ietf-cose-dilithium]
Prorock, M. and O. Steele, "ML-DSA for JOSE and COSE", Work in Progress, Internet-Draft, draft-ietf-cose-dilithium-11, , <https://datatracker.ietf.org/doc/html/draft-ietf-cose-dilithium-11>.
[I-D.ietf-hpke-pq]
Barnes, R. and D. Connolly, "Post-Quantum and Post-Quantum/Traditional Hybrid Algorithms for HPKE", Work in Progress, Internet-Draft, draft-ietf-hpke-pq-03, , <https://datatracker.ietf.org/doc/html/draft-ietf-hpke-pq-03>.
[I-D.ietf-jose-hpke-encrypt]
Reddy.K, T., Tschofenig, H., Banerjee, A., Steele, O., and M. B. Jones, "Use of Hybrid Public Key Encryption (HPKE) with JSON Web Encryption (JWE)", Work in Progress, Internet-Draft, draft-ietf-jose-hpke-encrypt-15, , <https://datatracker.ietf.org/doc/html/draft-ietf-jose-hpke-encrypt-15>.
[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/rfc/rfc8174>.

7.2. Informative References

[RFC7518]
Jones, M., "JSON Web Algorithms (JWA)", RFC 7518, DOI 10.17487/RFC7518, , <https://www.rfc-editor.org/rfc/rfc7518>.

Appendix A. Test Vectors

This appendix provides test vectors for each algorithm defined in this document. For each algorithm, a private JWK, a Flattened JWE JSON Serialization example with Additional Authenticated Data, and a JWE Compact Serialization example are provided.

A.1. HPKE-8 

{
  "kty": "AKP",
  "alg": "HPKE-8",
  "kid": "REOxA_NvwezfBm94AVWTk_xLqYnF9fQpwYCuPVNLhm4",
  "pub": "eJNI_ZxoDWMXiXYFvRuvhbd0JCOZHqc60uIs2jsek-ibdXRLvEkmNfcyzGYcKVSq2oWT6yJu_FO3n4p_IRmKUpeTo_JWRKBSG3fHwukYLsm9jKZ_3IBo_fkBsWXOrOQ64Sm0WMlPiVQB_7BzzsgoivUoA_dR5wLO-CUWtaVHiaQKDWpp-iMN0xlOogVeQSVt-CCCmtuYH9yEIuDNoNGz3oh0ODa66RmE1AmwpjxRTJdvdtWdb7y1Xpxi9NKidCWy64w0EQRylehcX4aH27g0JtMjNUss46BqPKhpMjeXSFgjIpUJgmCUgKqE_5JwDQDF4lCuy8yBqTCduTWeqMcyHPbLT_q7n9UxGCzIvOCRfNBfdhmp7IgPRiPGUxaUnHdUZ7wqGlljAGAV3PgW97OcIGi2TeV5XgMkZtETgwhuILodPRy_QMlZBXun9Bu2pqlBacwkvhoNzaNG6dR2nbtIvjXP5liNNQCDkBNwg1GMGiiit0U5FaBIIlvL-bGxxAx0kCHCPmOZ8SxYheOX9FpJn9Mu5tgz5LCkixqsUHizbIlD-ClHgraNM6x8KTJhLIg5AHxoHUcPD3pypVR9WdQ0KKszd0eipmJ2JZm2v6B_wLMhkVcRicO0LtA01TXKCUZEKUU09ahBz6VtPOCrRnxb-KeLJZgLxngfXBVzM8bKzoRiFhehuRwkUkvHYXOwBlGxdwE43MCp9xEBH-JPZyZPMvqWL_kRoRJ08hagZ-bI_NUBcTKN7jRJGJZFUPXL18fExUQ3g6zDT-UZMneiw_mXaEEW3HZ-MnzIyWCvUiFddds6jeuq7UouqtSHvsgwjpNrgPkeX8rEGFASKTgzEDkcsHFOtVASLWRLh0qWQgcdhya2LeShX7Ufq7F1YwCTt0FlHgUylFNWxEqWJMsn0eTPhAxjfks6UBC04eqO1HPDSMxt0Rg7jgeBL4VXL3LKb-B9NsiSX5EoxIIYNneu0-aPEUeEdYaCRugkDcey7ZS2KqysABhTAvof9JUnKfEMgqStVAYFRWee6UJEa-SHpnYyzBQDwrQavnySdwUyWtUskPJPz1B7pRh0kTNySPdulZu5nzUJCMKwqtwe23Bs1RpvjlsO72wn6xbIDodv7CsWuqtq5ChWC8U1ywukw5sgZ4eZS9Y1azDG2zoLrFGLYHQ9i-NME2rLdsIsRPY3lIlusRo7URuWWeC3avkOyYect4JfpklB6zZCWqVnSIoloEaIBxtTdycdaXtTlPMd1XVz3kmycPWIoiuSKczFWMaJ9YAtq4waUTEsOFKvmqNYFPRxjRE_cBsAMpexYhVxhakNtJtfxEa-GUePiQNl36mvCMAYm7sqn7XISTsPweyD3ZKKB1uNwekNJZp40aS8JWBYomJWW5jHU8QkpswDdqwfjSKE_gHHoCQe3-KnqVau1PQgGxvPoIgzW2zFmqMJhPlopyENASwtLoOkt3rO-ES78qQ-IUTBB_l-bveVEMawdEBo0UgLDVAqArRGq6iVkps3y2ek6iJQKGu5gBO8R-lKljIzPhIEJ2K0VMqGqkeusohO-MwuXvBiKAYJ_yB5IvTJAJsEHVa1JbPeNxM3s79Tpi-mDd4-U9KG9pESKQHExfhDsEmAiDgu6maRD03ZjvLb-4_PQAmUAzv_1pYIQtsV6Cci4Q",
  "priv": "VjHZjWaCNn-Y0trrVIbK6MIEYjB2alhX-i0vxMILzPw"
}
Figure 1: HPKE-8 Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTgiLCJraWQiOiJSRU94QV9OdndlemZCbTk0QVZXVGtfeExxWW5GOWZRcHdZQ3VQVk5MaG00In0",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "encrypted_key": "OvYtp_4UJ-fjBETdkJJRuDK7DzFTzmzwp-HTgqkwHncL8Do2ijdhKok84uq3fm2KmsmL7JsnRKV20YoTzCQPvFWliBBLjGXiU45Fq7tN_evBlNu_HOhC1Sq3A0zehLRP0RixnTNk2vY5-WPbbY5fMXI9dHBAmNUueI3NMeTzT7XLwWgWwgweGRRSweRKdZ07u_lASu0MGME9IfEeykdc4ehIynHNIk8pzi80q6KEe2KmftIv0K3LSUnDvzlH3m9DkHuvnHkF5HXsyVzBFieiR3RIKos6zF6zEpD-IWssY3Nuw8OMOY3n08xM_TVxOdMznqnhgixdFTnpQFRyN15VW5X0McNWBKO1C5QvjRGG_flmd1o-o9laoxfCQwQrZEQqbkTZ0VEowLekUdCCISkSkb_P2JQqNnQKDdFoTwj4UBlxdXuq12UnaTmKPm7upuQ8MXDWULmTidjKOw2GDZm6l3QovxUIG007yE9aocJrj21Qwj06aa0mgJ8gfzTnnKsy17fPi23gmHfnq14qS0yLP7142A7ZZNE_0f96hxN9dbq_6IntOTGrztBmxtGB3GF5Py43lMeH4zRHW3RNsTh3n8A7ahnhSkxLO6jRPCJZrGZhWY3uqdUvFDtaFHtgKSd2loQEhBWrlUVMeMHG46dc_CECymOkkBz1YeXUWnQKJ9bpshSYMannxYSaUUsud0Zt8LBJT6RIyQPTp7tcxGHqse_Ir_4d6d9PLtn8vMW6hOIIr3wwrMUfu32NkCOO9bjH4ejABo9WIqn_zI1agS7_Y4QXwdsDI7bqC8yhlYVKComJz7z4tCAmmFy-yVwA1dPcSKPqtO7E6gVDOGH5A1T_1_rsYtBU82yo38JltqMQH0Cm02F9tNotApt1SfRdG7Nleyz8qtjM5Ioq18p-QHC8WakqFEKqjlsCC3lTNh7Egl50NomcSlxbVdqROgLvF1BpuW-DZGE_OSEiSPETvy2fZJ47IJQpAvc3p7N6zUL-0ZffTy5MQ2NyqBCxC0g0NPyI8TCw-XdvpBrpoAu-3AH6FImfD4JcAVPGV3GJTMD2LCiIlFUSPLJEQRqSfAk-dSqTVe2KiC1nnGyTLCdFw63LWUlmfUOYAXHzfDaD4wsV3oDDKnoDgoJjn_QUUZmQC5NND7MfAyZDNl1-C4iGM6VUjLdHk3r1dq8LWLhRbaqFCM6bmNlY0v3-HAKzBrs6oMUKvv5eAbPWCNQgMbhTwj_kPEOcuzvd6K9e67Pz1Ku1tV7QCLgLedbF5MpjgzX96jGNkgXVAhagLPP2uQZfrxVrx7F6yDEOrGy9dTKcQzjGnkGA-_6SdthipuSSHqu-ECp_uPw-i2FU4w8dwdvlIVLQCjF_EbCsvRenklKWk2eejs3EOj3Bmk23uHfcOENi_5AZ7ybQLl30oxKy0SdIOb_T1-zx9q6FhAFlHLbJfjYsx8oEX3Krj8CdD0g2b1B5xOMkjqX1rW9aKB5GVAksb80UyWI0Pf8lk1M_yO-mLTT0r9Ka8AfuNtHThruQ-Fobuc9nNQ",
  "ciphertext": "X9Kr2iTefqJvyLbOEJTx5SJeupxJY321A2i9baRRjEDkeqT_Wz1qwYoByWitcrBJNMKPCHuSFv5gRLtxefsgDgwe7iNOPCTBp8IFSNukFUwr0q3V7DR4u_MLjuN1ZhKMMsHaDZDDsaVwH79x5aynjt_xY0H-zytvCXncOxG3eP0cpBIpA71hPygNPTEo36gEuV9JYoF8UWNms18wEPlc4WRnzFbYuSGgaj1T9iZ6C19i1yyfIbxoe2Jj1Su5C5-KgfqebUCL_Uwj5o-5YC7AgER5Xnp2L475lA5rQyPberO2G6zLiptjhGnYR9uiF3uorONnx9q2RGGeHtpAgeoKyrOn-knGl4IMDLGleJUFaC4xoKcpVZT66o7h55EqYcWopg"
}
Figure 2: HPKE-8 Flattened JWE JSON Serialization 
eyJhbGciOiJIUEtFLTgiLCJraWQiOiJSRU94QV9OdndlemZCbTk0QVZXVGtfeExxWW5GOWZRcHdZQ3VQVk5MaG00In0.3C_XlpO5Ss6szZENW_V2t9nZCeoshcJZxCZ4TUUyj9y9cdUBSxftpW5S_VjtCN_G_GKyAJD0jVElFlIpCSmavgSekgdTF17Hme7WJnU9cxISsQu2nfhD0VfdmdUMaXrwadWcVz1KRTdMdphWluWkgjMXnzlqi86fF8_q5izyGVEsr6KWrwtLyVOaFJrWi-z6Nl9ptUKiBd1iSYZY6SoL_cxOXEkfcT6netiNQitVeCAxvfbYEFNfvOmMMJHFUcI0PMliDkiP1EIxaejqK1U7c5EfGInupb7THW1ubM_ArKm8eymztuV7brglB5RNAmPBZe0SRp2-GfCoqzq2c_-r-hXIuTIzzS8TLmPi2z_s1QBZEpmm43ZtlCbH5jpD5thhugwiMWnysMOqsKI4xoed87HqnOn1qwHhbSUEcLN3Koolhtf7G6wt5SLwkCXpUS4WXyiE20P_qrKtFRiBIzTuFIlLq4iRaAxxD4uXSBsBujlofl2E8R6rnfd7YTaMCrC1S-_57y1m0TDzgNshMPLRZqYWRBLlt1LnhdgtufCo8ek7y1IxOKahiEsBpHTQ7VDlMxaZgLNRqRWI7a1SuSvnaTKy8FzkTCBs3TFMyUoHNXbM5C_kyPu649z4y7sr4f1LuckhSG_yTkJZRobOvbt_3c0CnJDoqVDuRjpYcfbUy4jtDkLQKeJDFPVjGUZpKpTOuFy_YhIBh-49d93xRozR0IsyvcQuFExYmWeZ7Hl66-hrwl30rmCy5PyexXS7hc-40123gKkslAU4TWJSuG9qYSiVOI5sPJxt00aK97OaBkndVnQsWuBMCpK_tAHD4cHbKn4xIUqUOilEWqslBxmdLhaktTBJq6oUROvOaSapBHVsVt-HBKqxe56yXhHHBkANziF8X6Ex1ciKIFnjruqeFrFJyA5XdAayyZlSUj6sRZQa4Hatz0i4hgp-D9h5EiT-_z0UuzW9YZxAQS5UuZVhgHjZ99X5wNWyJLEAVhmAqtMo1db487l1l6EPgqJIPVsXBGC8K4vagQ9x2DBLArWj7cYryTvCVntuYDK9VWlTrRhx0asV5fF-yStc_bxihWNGb003LeaCR_zX2NONTaxQTceJ0RLAq8MfjLKolcRIXjHzQHxB4TA3IaRf-B-bQ1n9PY9qHymCmBQe-gMt2Q-f7Tzbwd2VNF7KJ0mkVFWTxKlHMdF3WUg68xqEc2OnrabZKIN21S67CLRlvNvbf5rhGJNpiqtnsj40x8WuqD6eh8JehyTc1VwALcYmtTaAG1TyDVZ-Uzkt7pbsPVWLCuMPCUusYKD2sd_sGMO-QrnDh3zz7gaRxDfjxvOHITkc-ljc8mxbUM2rujHC6ZKSQ_CVt00bbQqSzG1wo19ZPzG9lmcW9a393Q5h6Yf6e1Ljotp_RIvanFPcWuubodVQ53Rm6j1Dp6e4WbEBhE9rBkH5tEEEVQckynpIAzHsJd3E3tFo7aBPi6ICtKb9n1jj38chkXgiYvBMKJk1W3B7X6xODxcvaSMGM8IES6Rg_LNJlJKRKA..hj0t8bxPA5xxphQAcfN7OSWW2hFpw2Szjz4LAXvWuT9I16vAk6_qEaEruUw1r2LBqXlurOCLkzJFDUkewuH6ra4S20E3hhVYlzzXQIEUUMGQh_t2ymxCrrkUBofYF14vdjuQogURaJNrphOKG4IxfF1MSxo3-f4UyRgkVCGogPt689OUtp_31h46luC_CkdSLakIGmi9a9sz-DgYFdJrmqdO1Ub5bFIg6LGhmXdK6p6eZO8X_VNFnIX1c_1I2vTMFPU9nXl3wcG0zi6_AyLfGTch-5nCPkg5rtnhPubF77yrIj9wFvpao2XnwA8ROru9skF52lDFOtzCe0Iy-jj707snTN9k6cUpzrs9rhgMXbC54LZGuhQrp3jmUu8_sUVHFQ.
Figure 3: HPKE-8 JWE Compact Serialization

A.2. HPKE-8-KE 

{
  "kty": "AKP",
  "alg": "HPKE-8-KE",
  "kid": "cbVWMyr20x6chb8wY8M9FKJ9ubUEYf5Pj2_3IzZzqjo",
  "pub": "_iSLv9sTKUMrDCCH4xob--nD2qAki9LDVkey0eyi77U7f1MG6bOkV6wa6FeNB7JlDVxzy9VHA9wSVgFx_mBvmgS6kCgJs-p5d8ZpPpqW3qc-vaheo7u0VZqZTlKXgsUr3KvBqUFw9_APEBcq_7llM9lfMhg9Ivpou9qSpSEc1NC8iwYjrZSvdHyBSPtaGEVHIhu7mNBCoEzNFGIYJ9lCe0MCvmFRoQie-5Ce10lR9pZdUWwfR_FC5VU-5YqwDWDOHHpdgBCPZXUbqLkyaGa3vwAsqsWBk1HL_xa6hgdKQtIkjUtLGaRlKedDH4WHs5QQlTBeg8Fm9UuVk-M_G8qqZGkdwnCvdfSM6uVqpnUafCmkpkBlFtV9XQxctREl60cwtdVNfRUlKsTGzJeypUm06PC4fNcJNrx7VPBVmqFnvlI0MaAt-cE1n_oGcTq61KRidkILPFIvtsHPr_WXxPFC3URfMjktFQVpfqQPF3eZSyVGDImHp3Qf54mWFnuV1mIqgbV5rax6gYZ_wWurPuijZSmuc2l8D6ShhFUnN_yxLhkPyjmi9LmBpyMtkfSgcAFrkGAYYAoNyiZ-N-I3mpywaWShcSIvfVKutAqPOOK8OaRhHNlOoSNk-bGQ0tNiRQF72bxgzdk32XltPAqCU8x0GTZdWpdE-ZjDcfYz8Syx5BdTcQxB4CJbaQEMvbQI76Kpv7LFzSxR8XG2eQeVr1IpY0QAbpFWMwtoeAS7c4w4jnYf0MWuAucRMFi8-PW9_FIUwGE6FdV-LtSeqEuedJfAg2S2MtQ5ezpJscqCtvW0eDCiPAx_HLwNChoyQaQtO3OogyE1MlWcGqkTcCdPMYia8loMIdEEGrSrf_Wv16SxQNmG--rFVvxoccmhMmpe53dWUqvDAsyOAAYgjgirlPU-4puK_IlqOIplfrXD7kIjwFNJV5s1rVGqd7lLl8R6BlmayzYLx8Q_aah2aycH70hIzsqdgnJ-w1S2W4mZCdZUpMeMkPyT7DpCs7oUqQia_4cSNGxKDkiRoHGD10ugOdFEYEif0wQbVHsrLPeE-tUkyXR3BpwWhUWB35gN6gexMZSWnFEOpZpbm5kRWDuFSLfNURydUmyxWMVMliScUWJ-rPmJt2ihcXgUlhUX-ynOCGhxaSgdgjg0ZrBXvua_jVA2Ptxj2wd1zkGl8QaE9simUGBOaqYlp3uYYPjFkxRP_vIoPFaWnFmizJPG8vWThrMY3vAMmaED3sNjLadRRkmvMbkzHEySk_yPxgCPqgI014p8DIKDvfwmTrIT_kEI1IVglhGesjMTxLa9LixNCEytUEyiQ7iSxcexwgm_ylc2gjgQk9HH4krDijJpMlrJ6KYUCLakWEx9TwCbVyNkiKacjpK8MjOdHJI_vXQ99sFDwVeeZ0diLDcPElcdmNjKHGh-U8Wc_siJnXwRIFhoYopumFSKKKQfmCrATSUi4BkJuTR4wlp37pEyUVUI7NsirsiIysC9TECkYeufh3Nejhltj6ldaZNQ5yt-o5lOy0MfYyiuZl4N-xrADGerVpCHy2yLfCI71es-Rmt_4ab52NBpQnwEz30vmU60sN74JEkTD4on2dt2Cc7uP7viMV4qLlSm2aZIwtmuPPqrcTfNaFNtQ59UxzL1kc7EBzS0UTvK0h8uVA",
  "priv": "gRrmnoJDnOkpvdgLG4c7xz53yLdcsI7BjhwJtKWfSik"
}
Figure 4: HPKE-8-KE Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTgtS0UiLCJraWQiOiJjYlZXTXlyMjB4NmNoYjh3WThNOUZLSjl1YlVFWWY1UGoyXzNJelp6cWpvIiwiZW5jIjoiQTEyOEdDTSIsImVrIjoiZ29fNzRQckFFWjZwcGUwTklxdnNrTWZNN20zeGxHcEdJck4yWlc2dl82SzI0dGxEY2xZX2ZRM1I0V2NaZmdmbXhhamdHc3Fjd3FROTd6cWJVaERfcWxVM1BaMmk4VkdJc3RhZE1UVlZpcjNsQ2xaVE04Q3NjM09XZ05Pc1gzTnVJTC1MSXRweFRSS290OWNGbFhUc0NnN2t2S2lZdGFfRHhRYmMybHJadVh3VHQ0QkcxTkNqcjYtZmN5MjBDTkpRSEx3RFpURUtjMkgwaVNNLTFKV21mSHdXOVZOS2U1clJKYXg5SXFGMml0dzIxZUFZSDJlNEY5MUR6N0Q3cWhLY01IanhaQmpneUJZSTlZTFB1andpUWlmZURDcFdwX0hDbUd6NU5IdWdTcHA3MTZNLWJmd1FkdGVJZGFldWliUXdtbS1lclNLdm5tcFVpRXgyaERoMS1QWkZ4SmwxMFhRRzQtalJnRG9OdXYzUzFRYVNnemY2R3NvN1FPVVFEZ1llR0tJRk4tRmRHcDRzcktCbDJKczNxVERoNm12X0N2MC1mRy1BVktBUHIzMVBCWGwySS1rRnZfc3RyMXNCdDRfcmRibTZlWlpIY3hZeU5XbUJ6MGtKOGZHQ3FzQkNlQ2ZqUzFGNU1ZTUtkejNYMEJnTjEyMnhpTWJnMFE2QzJIVnc1V1JDSEdtSElIYUlPRkNURmVPbzZ0OUpFNDBvcDZMbWg0S0ZKTFQ2eFNQN3FjSDVmVG5qWlhnYnlfWS1pYnk5b2xvcER0MGVndG0xRDBVWUVST21jeTk0VmwtUjlRSE45RWJNZm13b01lejNETFhJQjJUVmFTbGtpb19YRlZsTlJGMFF1Vmk1X25CMFpjMU4tLXZtS2lBQVZIaXVscGRlLWlUOGVGMzFXamRFTUhFN3drekZ2UUNZb003aHM4S3JvclNzSV9XMXcwRHUwYWJySVZyN0F1bG1QMDZPYUtFUk1PNWxnNEFjQWRDY0Z3LU53cEROenhLWmxDM3Z2eFBUaUN5MUQ0MnY3RVZCb2JjZ3ViOWg2S0pfbHZGdloxUUJ4aHF0MUNMWVZzZV9PMmlBWFFOQWI4T2xoUnBhX3Z1M0l4XzNrTll0R21ZS09oQkphbjBwVV84QkU5S0pzc2FQTmdWTk1iYUltSGEtYUYzRjBhTFJudzVlcmxvRzU1b3A1bWk1YTl1eEdMTXBKWUpDZHJkX3FzZDIxbE45Qk01anp6QVpwRFlTUm1SSm90aWJULVFmc1JNTlpjYV9icndmRUkzTVd3eWdwZ0g1c1l6bXpGYnlibTQ0ZjV1NHlxX1pBaThuSDJfYlRPek1LLUZQc2Qyb1JuMWdNVjdUc1VDMHhzZ3RyZ2ViR3JJRERYeEREdkdYMEtjTHp3enhDVDljdEEyYk9aN3B6MFl0dlJPRkNmbTB5VUo5U3pBWGpfNzlhNmNtSkg1endBdVZSZmVNS3J3ZWpCd1M1MzY0U241MzRhZ3dsdEtPSXR6S2RTeWZrQ3ZOcGFjcThZTm00REYzQW56MjhnYzM5TjF0Z2w0ZHpRNWJDRWtPc1VoY3ZOOVdPODBnRVgtd1M0d1BsWG8tY2drQmt1Q1ZKX3d2TzhJZ1VFMkE1bWRGS2NKdmY3NXdwV0VjU0wyZGtmMkFQQW1fUlhUeU8xN1NlWm4wOXJzOGRfd016ZXVwcm11OXZOLU9RSjhhZzcwZDVRME94Q3FReFhVcjVtMGZfMHFYVlJ0YlFhQkl6bEt1SnkxNU95UVN5Zk1TcmpnT2tpYS1JMjk4ZVd2dTFYU09pcnhYckVkczJ1MUFSMjA5SEhsRVNaUHFzREtEd05fRC1QZUNHRHFsNGVTQ05GRUNkbnZGdDFrU0VjcThlLURtMjJsakZ1dFl4VFp5ejJBN204cldhVkRSWHhoZVpaTzZpbUVFU1Z0TkNuYlZMRU9FblRVRW5XOVBiNXRvYjFhMHdUQkEwX3NxM1BHQ0NzWW0xcUtubW11QS01UGwzVzRRODI0cHRrSi1iM0lfMFRPOVRLYURlMmNOdWcifQ",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "iv": "EXOx5ijg0siALTkM",
  "ciphertext": "fLtbbTwXLsVahMMIgTifTL9Y2NKNbG5bK-EykGZ30Xmn3gOFfRERnqaAXHFin1wbuiYCeVVAX5KZFwU8ejEhynpOXY-viXcp6oNZvZFNFCBRwYViC6w5adU3AljOztLivyQbT4UPnbkLAcBIm-puNKyDAZQgKQYE2amDI9vKc7sf8uRgxFgybZCnMoccrbGKkjHrXEg2A8TwyzwurmwBpYIk-d2Bor-_WpZ8Rb9oBJQeukx6VUUp2vhbABm3oLFMRZbjNpg0OrccHMBZ4ATJHWwYN8AmbimBTwe1KQKGudVMVDbrKe7MybEDH5YgDxbMv1ZrXHOpmknTCGKCz2ZDVjGneAP1gStBs1RvG0jGidAU",
  "tag": "22l-02rZlnoDz0EfmiB28w",
  "encrypted_key": "L2MHhgDtf_MI3_xZAgYOi8QBU8CmAgbR-fmdLV4987g"
}
Figure 5: HPKE-8-KE Flattened JWE JSON Serialization 
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.A4nlwbHhIZeVi_Ns_T4CCQgdfMlgutzxsQlUv1XYDxk.8JMpJy_SLQpi8iS7.y-tYLQBwqg-5KzDcdI9E6r-c_on_48nJDyEJLxeWXnVgUZBLqBnLf0MyGLNhKvvNQAvMDRYGeapwiYtUaLc-Fu1F0A4ql5flcwr5NznVP2eIx8Tzpo8S46d9XwXQSitCNlKh-uodhsLqios_apibZd36H3fN3DQXytyJkoIbkVE-ZfUdYRpDmJkda6jyoktZrrv-NVGYL0JgkIN9nhErMA3ZbrYgRSBqOdONzqk9CdTyY5Xv5UGza8dtIyid7_Nay7nIQ076USfIW9wyXikm6V7b7BYvM-QLUsHnrij890vcE7XuELK_uwiqU9tb6A7V_zx3vTe752QvBnUIKJ8MWZsyvPxbyWZL2HrWdImdMlv2.cJwM2cFcVGSe1qVxGPvysg
Figure 6: HPKE-8-KE JWE Compact Serialization

A.3. HPKE-9 

{
  "kty": "AKP",
  "alg": "HPKE-9",
  "kid": "eXHMmlwGPdUeX1gGFEljtmqbqqBTHhZTYvy8lB67NAw",
  "pub": "nzg4uAQRXaAwSHARu-MvDwfJeclhojCvJzJ-zuCscZcpbLuiiQlvMNAz3QO1sWA9G2xkM1DO4yQ7ySybL-x53_Snv6A6bIhIGwUR0HWqbSaPJmxEZboAThAn94O6qsoN_0KmllMozHsWIhQ9PDACznJBP2ttUKKnurhWnilYO0gHxaQxWjkN15GDo5PGJNTDbMDCFxNPLUhYXIZ88iRSrCfMe3Js50BmDHxvBroxuFUFD7Vvw5yXeWVEKiEJvgMGePxbPxFGijIQh6ahk4pPFdsObMEomFIJqVZ6X1Sj_zUeaXAPFyDFvEDAajcXdDyS6NLOKQyozrBcU4Cr5mdS0KomE1ZG8OyHcjkGkbxvHzFrpGZ9AJljqoirkeWqu_ghtCIEKLEybKOtPPNLicamExFLyswD3PWTfNWGOKV377prU3yQB4c38xgrbmKPYXFWF_KUJPkU8pEaGSm9spBVdfvKpSqDWDAw3hBxCbTMCpqTrwm_z8SCx4JAmqCIWpcwiZUvCwEfVyyPFFG-JtAd_vAWoldTo9M7SYxG_yF8orxN3oJgPvIaMSlObAdOX-pB_IKxJLKTR4xShtAgavXJPrehZle8iHoPp5s3JJoJUwXPo5GyfbQJThGfUJk0u8FkTFlbcXJshNaw61CEmTwtLHU51WuMu9wlpnRplHhxyzJLM7kINKIrEslPZgxOBJbEXdOsd7hrCTvANec2gHRZT3tfGltI-CfEcmhKv7KV94NuomE1-GnBvMxwQ8AQH9d9BsCkp1w7Gqk6ckq4D4ujd1k0Tqi-k3TJrLkP8ChG7kGjXoFrw2K0lzehIiM14tIl7Kdt3DKm1glqG7MsXyHFHKqiaaZCwpeK03ETtXBj4Nw3mAbCTUYpNTy4TpYKugud0-ShK1uimVxh4uwHHXOY_mNqUyqPwqldhymaGjo7ebliVNTJhBsR77oXYRwbi4ZRZsqZVoWnrBIRpHEFt-ZMSiM7GdkfuNOQhEYVqxoSe2u-9PKvwHZG_PKClJqY-rGW2vMOMxmJhCdT-6SjyQYjV_t5NDxGQzhqYSijE1a2pBDGgwGe7hawekYufuFGTaFTYwR5OMZYMbSt37tizvtJ9VC-5Aw3u_Vp0pigMnQiP_jHUtPEJPJ4O1mKmvzMtvelHqFFu7KemUIPdleS1UujIdI6EqisyMuvCzwHIqd2-cydkpW5k4pSFXWFR6OeSUI9FHjBnpOt9BWYlzWvfhNdo9wyqEJf1KLF0CvKm5lIu_uOTPkenpAZXRDHucmRMpG_ohyKjGIylnJvqWCtMiI1orSO22upEBdjRJofBazBeTicTpcZUshF39C_NoqrGCV25AIr29KnPeAAVobN6Vw7XdGiTsQ_sNGqVMZMayAQs0mZ-fmcWDGd5rrIj0QntGtSnTiZM8udnbsSi8af9Rk_FAoqJegHdGNj2MoTUiMsSCIXT5kLvQgTJ4u3-dxrCRqHMGmj2WpznvQHGZefoOYuH_GKj8MyavEUhcU3LqdITkZzmgdrSBoIvaB0KxAerKCL8-iS8Yu0NlRaQcWWccbbmtyZxiu6N-sSp-P5oXH4HID4Fj7CTRgkGiNcT2hIDBUyvl7WFGu6XXnqag_oZHnPMw",
  "priv": "ZMOLvAgejqLZ1FH-7eAkNOuFRKkiuWr3jnwD5n3HOok"
}
Figure 7: HPKE-9 Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTkiLCJraWQiOiJlWEhNbWx3R1BkVWVYMWdHRkVsanRtcWJxcUJUSGhaVFl2eThsQjY3TkF3In0",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "encrypted_key": "hN615UIBUb995A1CHnmfSUyM8y_4L1CRUAb-rojQou6tNQoBCK77QG906SBfNg_mSPV8mRR-cA-tKl9b429XIJssBeJgXfs_nPXw9dxScy9ROoidwYllWOWSGsdbK69MUO_d8Dm1kN3IvBQt5q_2zXVn21km2XMbGRF3XBNHCw4t0-dLawUbF9Y5IPRnmVCHkyKc1QhQLHXWxzU4w-6L-oS2ur7Wsu55cHBkBMdZ81GKLI3Cx7MVCzbT-mii0pDuMnKsQdvQYjNSKXcTmJ2tsVLTohoCe3cO6OjFpWFIRaL7nhPKE3ureR2D7w7AhFkrRByTZsFIKT8_TQXuJR0phRHHcBXB8ImbefyqTLr5mWOuto3k-55W0Uq0NsL98uhI5TE_sqRdI8ZwwF_YMfczBWYK0_FE-6hcW9SFBsanVNMaey9OwJlbvb8Vz2I-ygm23pYJa-kNiBudQxqIIwfcdYFXZUbEtBFvpsBMxaf2-N4QaO5C9GjJe44utSCUnWY09kLIUN6t0fsI2la9GAP7cWaP1PxohwfFPYJrWJZJhwZYxzHNmnoposNGxvDpImivrAW3bf2-Ejt723J_OtgpF6njUsxve4WWHcJ8MvtnrkflLRcUT1nMR10ATSSJPBMFo2TiENISFV0QdmvQG8s0vI10GMeEIax-4iv8Im40mqPECeJrgthf6W1v8_IUps7sWYulXi3-o12dc38JNBTefKrkQesyvJIkkkr29MPpBEEGxmWCsP5b00S7ToBqSjfyi8He9gEuWxStRtl8EZT7haEBF-xJcDhJsMWlq3GdMKTPs6cKUVYF37WJ-_8tdj3LFwig8aDIuKKouO2O-lFFrNQZK2gjFlprlghu7wIoYrZJ1o__AKlw0WHXQVH9spqgykVPFp3dAI6q3LXDzvi4pQ5wj7KTDpmI5oNYxl0y4wemlOsrB6YhLQz1l_HldwAsQUFYzbcZCkBIKu3yoIINY77tRSfzpTuDzoW9zMMED2J3ws_4hjPm7dyJBWDRGtGrCi0yNLWIObu3RD0fuhckp_jNCKx5lORd8Xle4ObVev_PQ9QvA9iFwczvW1QffQbi79s-9MTpAP_a5KNAO-ON6x6-lw8f8LIz_zJKcnSm7xwcukmmDqHVmTdu3DfqB1kahk0ZYJBnbIebguxD_vaZ3yogfFnRjgswCJSaITrckO9zO0Zck7rEJ0F7zGSMA9bs05zwZo3yf6E20NLBJ6KJWcq9AxuG31EgBLNaeNrJDlK8rcAhfdnFKVB950UapIDwWMCaDNH989TjNRwhkjNHTlchxGgO6a3IrK_nTM74jum8AwapcmicYefWIqJgK6kpjZb_B1KyjUrD_1mbTm3-2J7ZOsv-SnZ38wK3mSkYyAYa14fe9Il7L0pqTYkoAbgMuw9g5b5k1PwwtCF75WFcBtUAnqY9WsQQbBfwe3Av48OLAzmmxzKk2PqrIm8NO-qh0qrLbQLA4zR9f-9z9lBXMQ",
  "ciphertext": "lGAB2zGvuazVWpL-5EXGf335Myjuk7efqL9NLYgiMvTfFJE0hhJJ5EtzS_bkrWHZW-4TVhmzUlH1wKYwKgc0i7XCexQ9E99HpfNaYr-hNj8qmHu5bn0azauhfFH8U_i5HtGaxWRV2i_RKxK6hYYPECrjf6iFFUQRj6O6IU6vYwDmg_1jgGhq5U8fYf5ntcBjFDpS3YGbrlM7ZTEo3lr15Q87PX08Xwv6wpvROTGqQTPbzC6ucFtu7hUc0f8FXLpOoEwz9_zTFjj-KeFCW_ichZ0yO3VZqfZxWH3uknTfWLiQAgZeuDWtzDnNW-f978xcYhId_vSezIJkbgRfhP2XBC8YP0it8rV0-c2jOr2Eu31izywk1N3K7ii3Po8LUhJhtw"
}
Figure 8: HPKE-9 Flattened JWE JSON Serialization 
eyJhbGciOiJIUEtFLTkiLCJraWQiOiJlWEhNbWx3R1BkVWVYMWdHRkVsanRtcWJxcUJUSGhaVFl2eThsQjY3TkF3In0.Jr1wdVVTQd-fGmjV3RdfR5sWS9k0K4bRzvGjJYYNKfCKrVZx6qrM_4xjO-ptmQsmuOPX3aj9NsqHL-BXL5MBNGggV2GK5QsmNCU9wcZELGObNvGe2KdBqDvtwAuFq1cwz5UOikil-UZbdPfMxScH26qfCs6lQDuw4YXTbCpmXaXEzK38vvrr28sGA8cKihtWHm5imFrRj6s_ZhuQOiFaZZpYleSNXkXgVTfuwDIVUiGijJcN9hf3ZkYQxyNA6dFwEg1zAU_5HQO6Y4zRHatmWixUefB4Mu9edkZhiD2F0hKNFMpgjGcLK25G5KYxp0SCtzNiNQkONfF0yacjRHbYaysWTmfn1p2hhslBHrWUZI5-TPyKr7Ki4Bogi0GkReEnHb7xJlzqnYFiq6-zsGH3zyDjy5DrttdRmBdoYaedU_GjT2jvsyxe2uiGGHJr8a5FQdTuIksnQpL2bJ-on4lZ2fTutWfJ1gF9j3etzcMv0rZ3XVjcIC-Awq5zIbJKyKH-xkucixXcFGHZOfUncDLrkgXtWN454Gj7rZ8GSktjnv9oJBdeVtG2sO4oumX5BDRIdNIRyQCvlf_Tvmk89jMpQBqiNyf4smxgTZpMAw9RIqFKIvVvkVyjFoLfp73FvAG3FqTzkn63jEcPPwI2AHs5r0u01VX3vXm9OeJK3thNJ1fXynpF66TcZZPIao_iUJdWbTvYoWWFQlQsefOo9OtZj5L1pSLsCUlSIPbNHHvg7Kzsm5M0ql6MMmcG50QdZkZ-2H3bQOPn0rr9S63IjdotobS0DsiACHc3qiFy2ea_vo-Y_5V4sDVxb6i5bByIOR8-BVucy5RljVwfeAzuuUtfGbeeTBtwM_zI408jkcCVwlKULcKiafCqycVPbBgPfJbAe0-UJMtfV7HPCt4tuTzV2Yo5Wy5KbkIBxFuj2r2pp9kcAW3tNbo3GNgVjhTuGac3_I7LkebwRUSaw-My98DPPIZP2TOZ1gXt6ZSlGKviadz4FISYejnsVvUGnX26FoTRmJrvmfBpUmMN4sIauEeTHfrYgS4V9c59Ts3akDnsl-gt6hvM0TKW34kNHVEUGriAcXAudGMPqUCHQ7k0zQTI8TPmdLFwjBOVnyjYe5ki8ZcgDURCAGM1HaevkxHlEAQsM4fPn_3LfTJfVDdZoUWd8WzIhuhn7JBc4vl_GGS9IoS1RDXzPFPY3Bb0aq3_Wbj4djQIr3aT7HIcI2O_2eM5o6Q995G2IbKVrfqyHgw7rnPhuRIz68IRNXEMu5X0BFkHw4UrVDKZbcpJcZ3NjGkw9LU1XeXUOPyyycGPDItiyW5dV2KblG6D7ab2ZVvYTBn9tG4YuVsPp6cJVgGw7ZQpc3D74N-mBV_nxPwfCBcGzS7rFa6HzcY1SwdMCPnHTGG7tOPATQEClwcnEFjgxH09LK6tvKYXvvAGbdt_PbKpQXd5ZpTThPttf-UoYn4rk2x0aykqvTP8BVkjIl2Vm2z7Ig..2mAHcSm4XW9vjPX894Nl2sC9GpiCfPoxpdun44UT9-nvBFACQGUHpeM33zidmn9aDt2_wSpUxIvNo3AzEniZ6yP2w2KjFFNiJKDuvdaSARn1v-_nzw21llB35wFKEsJxZDqnbH56o29NbfeG0udNQ46MsGQmKIygR59O7CxZ4Z3sfkbTbZhaATry-Yk5mI6opW-zGwaOE45RcCBQ_CAN0m7omy4GMQ8fdT0_zQZIZvydhEIQZOfrabnKDFpc1JVOI5GTFw66WIVDW8iFd0tzY4TcpkGpzMY2s_zlvp-rzU-__tU7uMF6t9UEV_pS6YyzJW7KlRWvlZkD6MqK66orQxIY9sPvv372RLH5-Bf0KhPTwj0g-RUa-_BZso8OhKAyLQ.
Figure 9: HPKE-9 JWE Compact Serialization

A.4. HPKE-9-KE 

{
  "kty": "AKP",
  "alg": "HPKE-9-KE",
  "kid": "bjeJsrVOQ_EwPHBRUdi3Wt6iP7G6ycCI9IWVtIT3sqE",
  "pub": "pkkBMGBG9mJKnAM_jFOnHAzOqqJ8QhvB-EKue-F0ZFJrDvqz3ICZXVkqVakkePS5UyGlckCuA5gU-WYTJbxV-bvNM_ZaTCOJ9KmOB8MAvGdeyTgHZTeaDpBLoNh1sjeFc9xWuix-Yltw_abLciOIshxPLBSWIVMBgnWeWYdOQFYlvGcqabRXJ2GXuAROLegV_2V8MCqpNBCtioA2HnYzl3ROAmsjN-IO2YKbLRRDnME54moTvBkj_9JfygGU7-KGPJQO-AQZjhCMr0WEqCG3qeSO9FIeBEVsFdOgwHVmYrE3piSss3V5oEtBQ5uiA7xcqSJyF4wB0mQBugecmnFpm6FbObhibQgELGZQwPUppvlA4Mo_mgKMJwqJwYfFKjqKRbuLxkwWdgWXrwohMaFqLSZoxoo3toQbAqBh3ZAJKAB068eFRDKpr7lAoYDHJwDGa6uluhe9yMZCxnNL6lkkYnk9OFEg-lZshaBYuINTChNrXBUjUOwVm2g1QfUWeZI_mJmHSNAHaFg_puFXEsUC8wWKR_WZ5dPCv4KlJGe4JSCw0WSWANm18hYD7ywROsW4sBldUBaMnhMwypG82ExXXFy7k4U9trrMMUcWComAl5FYdretI-eZANglUCs10cMUGaYueWcDPzs7joWcAvA8lZO64diyfpwrAlFekohdq0AjuQRoAFtgGTe0K3ENAcESHhV9RmRoXJGjRlcT3MF1D8hIQQd8psE4jIV4YLQ9O5UX1Nl5OxMnS3m--lhHDvGc3uPBSTVjUSNADjkmbPVbD3czxuOov2GDIPYj9jdOU7szBflXD1pODOxgeXI2hGWuMjKuh9AlqVyHUYVHF9Cg62PEw5ka6RzDmsxQ9Syxg2u_T9MNCYlfkbcHIKm0MLc-Qts4LsVQi0ZCjzdYLiZN_dFdDYizZ2aT9URaPDItEinHKXg9PvJ4kcyvWNYdtMpm30Ka71o36MMAwpVmEjRYzLlEsmB_BkiwqSxinKQof0NbJmVIFkE3OjEBxOLKMQsFSpOabTOaO5rONrWvsFygSNc_jGkgJKyyI2Ob_nNP83IBMDCFUfdg4ICZg0FMeYIwRwoNGTyRRgdKUpFE9vNqE5JcG-W3rbOpF7U_S7QiNVR81AuELdtyl5RebupQ3Jy4pcp28IfFnWzDikYY8AMduhApByPCv9c2AXetMRaDTRrAxwy-iTFa1CaHnfUhiaCFWcGr56Yr-GGV40YzwcxVV7A47piIsmsH9dkcsngNLLSMGtcn5DmMeJFFxdCZ-Ol-AIyku_lGO_RlFGShhqZNCEMFZGRB2JlZUwO_8IR6EYEHVBLHZkwaU_NkVQfDMWSwMFEjDLdUluIJTZYDzcFmdqQKXSC5o3oIZvmtaArOZXkWmdZHkewsCTlsXNCz1fhm3IvAO7jLTytNfWBpNWatminDYuYxc7KnH9KlshWsfubMolKYsDiuhOxbmVhhapYNCAKLvBMovABRQ5emVAgK-yVmgRarnpA1ghGq2FJjquCRgEt809NixXh9akwouVuxhFU6u07Om-n2-1ZgLMhL0KBoASMCe62Zh-gYMy8ftJ3w8MC2K6spYJeE8Wmr9JAONTnmAjexUeHY7DQ0K6TiBg",
  "priv": "QXJAupnO8tmrUyEBWQgZP-D590HbmpuZD4oFGRIq8PI"
}
Figure 10: HPKE-9-KE Private JWK 
{
  "protected": "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",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "iv": "iLAnJIynCHPHAiHS",
  "ciphertext": "lJWVgaIclfSnF7erZXExiboMItR4FCuMMbSgIsoBvd1kGoBFdq1KOyA65YAKrsUbE4mFEZmVgWz8i5dYOeybSWrnFd1yNeKYsshTKK8KCzKvO4s3IXn9tQC2sZ5LLhYSoLRZen79mYJiO4BoUCD8sUJL9AuKJhFt2mbWEv3yDyJaOdebXAUj0KaRKcEeQkksDceuxYmOQduc-KDbgP55R4j8axrwLwcpje-ddXDTw7f5thk1MrcFR4vmWQ0qwxCSZeetLTlheLrk9uD1CcFaq4t-re_hmecLTm7WQ_nMzdeJs1BHdjgaj_-3x2k14PKdtgCFulwjAEYf8svUlZZPXIbpNbHG6_Pcoemi_CliYrUU",
  "tag": "INgk00e8kdEohrK35jCKaw",
  "encrypted_key": "3Cg6I0jMyzgylOcmVLDxPkDRuUcUEOXFzBmSv6fFosI"
}
Figure 11: HPKE-9-KE Flattened JWE JSON Serialization 
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.VScpENor-M4_vrAMd3nenrx27idKVUIvgfNWogXg8yg.-gbRYSJditJ5jOfD.ZCcU3UJgF6xi75RpJUGGbihM1WW-TAzP8K03NPg2yhs2toSRoYFUiCRckbVfsXqKdoeXguM9bkBeoa3JNd5o4LN7V1-C-gATjmRz6fuWe4Nwlp8ZBoE9_2VsboUmESX-Lgm0Fkj0PnyKGm_YJu80HpF0WZHWYuFuJdN0ed-6sS_QGWbE43vNgvjTqWChW5WHi9-spoktVOO4uayI_ldKYxoPlZVk9SJRP_ePSoYxEwdEBhJVTPNamiWt1CCaV9vzh65DWA9S0nyq2ekI_6Pk7q8xVcMDGnX_wNewbuG56ERSiS2SmuiS5LXTh9-kYsxMeoWKPyiyrPlNyUPApTxtVkFTcB96-Q5BTfFuPL2kxYgi.5zxOn5Y0WZFhoZ4PIXV6KA
Figure 12: HPKE-9-KE JWE Compact Serialization

A.5. HPKE-10 

{
  "kty": "AKP",
  "alg": "HPKE-10",
  "kid": "EkIcXLM8dkXQX6mzrxYWNBY8lndA5H3H-v8TfiSDLfI",
  "pub": "1KUYqsq90ghiwoFuSJjL1qKhZhRQujGf6cXJtSRSJoShpMyQGMdsu-eTJTE6FnZeUQNtWyNfsRAjzQqYgCvKB9MWZddwzkYlCqRSXlcSHmgQCLkj9_TIJZipHIXL1km4_2nGOIQ80PCbxscLN-iyKKt9ikJt1Ks95aa_PSwRnum14MVuHIyZu5wAQxPNTjw9S3EnI0ODyDaPaVG5zHqIB-mW83I6WfJUFQRErfRHjTwWhztsYLNkldjHMZYKxAiwouemzdymoIoBxaebXIyLnHsAycKP3NByWaxMXrEpdJMGQveDwbW1sXOffAulTzw7boeHBdQcGINzg7xiIXcgYeq95KmqbNqKMkZNFiA5wFpOjoy1kUE9snCwVsV-I_dUrWckargyJNUONoRMOCox4cuziEUU3WkBK9pOBKV1WjrL0kBqBZUy2DhsmJLG6QjJLng4M6S4AxAmCwp_2zNjFGaMbLZCoKqPt-FGe_uXyAVqoYeZ2jAfWgQubrRAl3NVd4RzAnQh4hp4gPU_t9mwS7sD1kd3-zm0sCiqRedvNGag59JDFAIxuUaw-XrMyVx6dZG5xfOnaUE8ivuZ64iPQ9asASugUFVJtuQgD7pONlw0cUQq2-qVV-QTS3SG_Agdn-SDhqe8ixVrqQI0TYmFVAquRniDgEx68NM4jmyPvwuEQeN10piAj9w7jOdF98dutkd6UsQGpPcgXcsCRXrN9uSLpVQCJUUzFoG3SBcuUEhh7DOr6mAcG0Zae0c9E5e2qTZ6bUU3E2KZZXub-xcZj7oGSspwgrG2ITd-xzi6aexu7guYMMaP4ek3PEhjUFwV5HgtzNSgp9SOQEAPlYJs8mCpE5tNsYquJ0Q3CXYa6uqe5SKYY8MOpmkpuajOmIQEbvUjmJQxjSQxPXcDP0a0ucdbG0k0kshqrPAUWvSoLSjAVxAdgyxe5pdXICkrSjs0LuG7fac0gctlw9RIurq36EF4EitsM0WhAeubkmEd7ghIB_FImfQKx7JaJscx0taYAehRD3lN3dA8m-NNd2JkX2DBXmQyKqh1JslcaCHNYaco5rlRqvpwR0t94_nNbklO5oAy25ZcJ2iaAiwAkPSWptfMRAM1P_TMoTFTv6R-qKAexgqtKYBK5_aJKpGjCri4GSkwv1RPeXC3mrOJNAJ_8_jNl1yVjVVVh9lDSTQGOrtYWlmHA9jGATRK3eso_DO5ONWRytaY_awbxLJ3ZeSttLZEl3Jj79kd1LigAXFmLiS5fNxiqElcjugb3Wx2dNPEhVlc2dI06Nm4nnfIEUZDwzkfDcU1-dJV0PcUCbAbPyoraEqVSGJwMVFkt5a9QqqUXKY03hJsTaqEukgM0rYoPlEJ_UuqRptoGFZBWdSct2pEI7muOZA0licZpuYqx4jGCAkjS_xuaFKjieExA1IGySoEX5ETuREZTtNdp9hDKyJQ76wVcoVqlniEHeUTSdxgTIEGM3NLacqxHFVAmgURfAojo2UCx4sXXdK47RtBuQiBf5Z-0hx2DDqvgkTOKzy5trEJ9MhvKctYsYRWQsWz5ly0WTAgUeLPWYWkLXxi5BYAF2KqF2yCatyQ_FQZO7mwCZUB5ZutKQcxAOAcm3JGQRsDL3cG2MBlH4UkOihSUNsbsrJ3p9i6HEFc8IVmiViuBtEZbdFZ4wKD1Jqah3ghkjtHbhwLdME4ZQKs5jJZvjGFBsGZG0KCYGKbf9QQ8Ooc-PNjyOqzo2k2y-ETtMCos6KdcnGbyrEBVKk2rKLJuaDF_CQ9q0YQdsQ70VaBjeckNGLL22OvhiVN7jbL1kJ8bubIYeymm1KyLRcT0xmpDDgYtvAsygUdQykKbtSmOxhHZrcIFeKazWWe6qcSZCOML0hszyw16MGUiLtVfEAvp8gzrGWQFCA6aDhrnSs8YDMAz5Yoflp2wai8H7gC27ltycEpVsWz9oBhQPcmq9C6h_kX7RqfrtusXPBai1pGXBIz_tu9V6ETzgszMUFOFdoKxscc5JcNWgWRaayYDBy08VenbQggLsOd_BsJ8kVV2fwnIp4dGUmthqqjVkrGtl1OKCYX5_wb8D6mCByPQ_BsXIMEJqvQYJp8bSZ0Bp3NUvY7EBwNvM1gfMiOw_pwcXoglaZNgzWLi_VBzXIY9lcM4qjigOlj9JyfbYRGPkTJ5Gj4Taj57OC-wIVoeofByZ5tLATYBKFPwjA6SlRhI8j4EiKN",
  "priv": "Ru9DwxiJ7BdWBh82FsXaAPPR4s5MZoadKL9y2wGmino"
}
Figure 13: HPKE-10 Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTEwIiwia2lkIjoiRWtJY1hMTThka1hRWDZtenJ4WVdOQlk4bG5kQTVIM0gtdjhUZmlTRExmSSJ9",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "encrypted_key": "p7dmCNgrTQ3hM9aUKmKnrE7r9UGvlw_HamS_oDn3oCssNEQLH2VI-1kt698b8IVkcXZ8Sf38nQ47W26l87EO2P75FTpYPOLBKtbnT1TVm573azwmgT58f03LunhVYEB0Kczr_ro6dk5WSE0Wqn5scSXyCsJZESno73d4zKLJzB4nUlZ3ycVXeakElQiJ6ORRNVWulekaNCX-9oCDswQDROss50b3P0eVCwtiHB8nrW-IoeBWF_iUqgROfNs8RrihpAa7MsQqnTtMSrc4ON3iUoibKD1Iq9GOmSyYheluzc7fCDTEY0GihMWxSGhSR2IkeRCP02iIvzLUpxhuYJSwxk89fA07tD1Jp4-pJX0MmZYEe0Bw4cZHs713bgx2uX67_YZRw5WrsC8C-FOMgNjCz4pm2t36s1IlRD7cMPTnVg5VhLu0eL-2GpJVa4Iu3fq4WqavjqmK3hkAula3t1EpPPkZJOLcz_GNsJ-WdOaUmVtaxUtXDGjYuQWCs51dDEadIXWiv9YmPak58VQSz3oI3RXx0tyLnuXL5QFOq2JC5YS_odeYVY3-tvPWDL1IHzTccZRz7huZwQXI9A6ZRvWmF40akW8XTevi7W7tpJQ2J8zPvzBmpLBUjPmPAuR3Xh3_cQuJWYcgA4vboI5vvL4fN_q5qiYaaUOawch1H7Uc4K39sl7iA8ch7iD0LyApYPkF8-dO8cNwMQ5HMO6pM3HJaUptvhdzqiGB5063WUVTZ92_4HkWGYoT9CFeQ3HQJSHqBKi4F9k_wOXEg3nz-LGb5Tv1rvWqZLavnYzXoz-zrlb73Zj1Vb-HT8jww0fXjEZNSTVomGY1bUfKhwzNXX9NbWvwS6lu9u5Zv7OP6omOda-FW1B2CeCHB-WCTPj0lE3aGfEpUwkrsm6Nh-3ozHkWyclQ1Nxff46WrQFNP22Ajt6wDQEsP9KiOq3NMsIYc0fpJELSyNoualT6cWCBCwmFXxKmFuPjzjO9QPGdeu5kfH7DUfjbDpBc84Yg6BnFNDPIDE8AmlpBe_fT2QFZXVbYZ3w3dx9doBbBVfxVL8BlH5IvbersmF-i3GR-fT3ry46CXltE-6-oApr9KXwRRyy8ItwWuvHdkJHDyI5tBeX-UuWEBemYjRzwgxACFIh-cHMxreTM9hLt4V-xOOs8GWvhKjnX_CV8ieMBoB-Bh9DaQNiy5CzTnwZhltHVImkFMe5cX4j-iSfblmv0EuPsglBbbjbFeFB1URgSavBn1NIBUfG4lcWLFL6R_7M-GqsTKR9wbUdfw_IpCb7RYYN6CVuyq3kQOnLr0WI3loz19BFuLGYClsCIUNDdIx5qevjWIhXOQ7WO7Inwfb-yKrV-SJ8IizXmu3Ph04sUzlaMpXfOY4K4DDRIghC51nHYlJJTu_fp3ReVvlxpMk2Mcl0u5_cIt1YddcnAi1cLzKdrzGO8kTmhvyoGe5CqEvOLaQjX_FFOo7R3pWyTS23iBFtvyORQp31qX0ttun043UTrMi099RuNUAus5Epge7ukWKMiYGRJvS1y03e9qcPR3DO0mV00pvyd7r7IIcF56lqXEBkXGs4ubamtbqrU-S50zuOoZo3EdZxTAe7qMlXJKgkUbta_O922NmLJ5E_mayogfshpRdOY_dhh2LsmAQyukE9FpwwOfrC-KohslJkweb3L8M2Vjr5yQJ30TJAQ-r4BvZJhxMQrEJSqvOKQiaa8TnnhqT6GXDepe8XmoLoJj2Im32zk17t8jfeMn66gnBROw_j7VndLuidZ4CdtWzDYHa455PJiMYMOStIp_siMFTm7yOtO7Vx_g8eepDXCZIma35dgZUguooUS3Cbo6FB2nrQPwlxRA07h34bFSY0ctofPj3mcXVVbbUAXzPIL9O-T4c5prs3WNc6_sQO5nK7E48iEeNOkSyjBhYyaAB3a2K_aZGG2Pc-Z8WsBWh4DLmijeefXJqaCkmQ8zKLitgrA7bQfXUU5jtDw3TVi7oX6_njV2ueAKhaqDfuNxfD5YeRXdiZgAVe-4ijFFW_AK7xQ7xR7dpcQ0HrjQG9MEQF2CN9m2I69xz8UhKNoedgunVvZfs4qzjME6g7xKJbVjHu-qmah9hoz00hzlx69akGYzyfTV9I3Y0Jk54ic0QWxOHnnMpy_lvckpVTk6zb0F2-tC7njkADOCIvUWPHQrezJ1_qkENj-u7TMz3awGmrpcxLH2kQoFF2-",
  "ciphertext": "R1U46UcworWOJyJbNM2ISY0OmEB0puh845f8ZDyoCUXqFBXUMmE_pcLJqetqYWQtuYISLIUkPfwt79Jr86b5CY7K5c6gR4NUosaj_C2B7MGnK-u1Jdte2-iLrWze3tQbCfpMX1G40WxGQqZCmXB6KWtQUObLnZ0OzvUt7hAeyK4QZHwr8rKz-5_PSIL7ZCWSAWZYBVrOmjCn8wUpi57HqrkrE8mK3kzrTsEQXkWYdH_LN4ylbFLtxMujgK-mHVbnEkBsRelwsWUT-IBNNukMFi0ZQqc4bU2TPa_PMnKXGqnXJ39vp9mFl0koB5k5_bKJGhfG6plSbIKq1uU8h332dPNJ-VEzPN5XJisI05ZQOsRxlpul4ELff8P5zqLInriieQ"
}
Figure 14: HPKE-10 Flattened JWE JSON Serialization 
eyJhbGciOiJIUEtFLTEwIiwia2lkIjoiRWtJY1hMTThka1hRWDZtenJ4WVdOQlk4bG5kQTVIM0gtdjhUZmlTRExmSSJ9.ZgHe56NDb1lYSR3hjWdqPHrLTiEL_HEm07D1xGR1YpOyObUnNGHO_tc0rGoRRUrmcHyzFp7t60c1Atgu6VvaG7feGTdPMaYreSNwgg4G-mNPKdPEMi1Twg1x3fNZei-n6whw1sc1LnvnLSwGIScskCj8WJuWtEKGZbIWuhGiriO7di9Nq0nxhvTIDCfK6CPqblFv45_hSHMh2iiaZwOTB_mqNVX8-OwOwWpxaa2sSwZSg-z-Es96vIlWWd7L3JPdo_KOgS_lRMeyorJxsL89rK26HAZLr9VGUaH63EsXSIGo2BfP4Pyw8JmAVu2ug8O4zwrf4BP3idC6TRK70A04t3D5AvU0DMrW_OlT6E-y-kPEngET3PoL00EmfQ4WbHyCBzRt2j9PyUFivH-KxRs3JiDW01GBtrruv-LZg7qc22-STwxAyXrX8a9lQvRkp3PTjSG5Fih3GqRHU2DRX1k6g7SMa9mzJjOAlkVmZ6EOcGON9E_xEcqFG-80B86myHFfDocesuRmC8U2NgsXrGDEjHeiTUmxRkmRADJZBx_UPFqORa0xV1Tg177q2JA823lXOLsaV7b37197fTtsrYTomCIPOEEWT2ubTeFdymWS9x1aoihNdSrH0e4Ubjbpfjd7hJeCIbb7rC8jLtMjTG_Mp0kbvVFHIh157FyGpcFHj9QD47vOvHVJM1ysnnHNEamuqFwzwaFSTa0UydvuUmn6k5WcFg2uSaySpD3BI5w-l_HKvfP-kfc_JJwuMM7pjuU7rC0zdgu1fEPGmr5q2GcslE3PbIQZJhG7KfGZ16FgjiyVRBleRo_BMAXSaxgO4kYifINid2B0PnXRMbTp2zeCoPWxQHtrHq46MmqkijZnut1vyd81s72uL-wXnKxyfWQIaikLLe_QYw1naTFVQ5Bmruhxh_JuQ-x6OeXKxE0tzJlHwi3n5FdEAJ6nANLgZVlym4BCfht4VVGvKCj0my_Jv5vbmfNbmfSCeVxif56mdH7V1hn7FT6pRtiU91_B2mBtlgb0gHUXXNxKFJQWWfy8PIVp4gktfOJLbLAq4kAuhdWgZpj14PuiX2RL38nmKfQ0sItOJR_ukp88rpuGrsRKU3i6suEFMeAKUwvUWa0j9wKAA0AonMPsNfI9fUSC3PZ6NDmgdLtgojfR_HdYqFJKQscL82nTBZqVpHapxZOOYYElAEzVYvNPi663gUXQViEsqitzKXUmsWI1NZe1I1-cs9jfcD8HPryxOfkfjlQ90CVyqxIgutXts3txNXjocoj1WIsqN-ceAsd88p4VE2JwCYn126W928gZGwR5LMzprvjMHO2tiEBB4H6AaQ4duhRrQcFr7Pc6rfbr5CIiHTucfCH-jc38s2a_iToo2CG7g9bPbXNImINGs5YOVLVxQdiURWMZzcSxsm79FEUT7ZvZDsX_WxjOpTbsekEiUzm-uvsLDr9HXE3hf5h3MiHpz2h4LD0ARLvByJ3kSi0BKIk_1COw-0jQ2eRM_DWmdemxpwWWqiX8vMgi7zkTa7sSjr-tAsAYZ0QlqHyfcJOi-IaWniOr0YxUgqe3M3gb8rtAY4Hxjas3xDB9HS8P0CYSwqVFnbZkucb7eDy7JdGPh5cl0G1L2snzA9HEEIzuZCGWCl8cgtJOUCeN_NneYvDTpuo5AXaclP5KkiCx6K_lakY3z0Uj_UoIB-4VAu3TCm_2wb700aFmmR5uH_lEx9ILvwBhgwCapDyahJLUxgSaTk7KpvQjLy4uccavTC9pURqDYKI8xMpbIgKxUuvk45MLa22_eoBTrzpCWny2ya4UEyw-qW-pxGELu2Rm5n7umpePFr6DpVvXvS1cKi6-N9HolKGIoYpi6PEqnOWDQMSuIGFX2AV0H4ySSs3Gla379RQlNAV-Fl2baNXXmR9ZieWhS2pkDCChi34IDdvWXcoqwN9GC3rSzmDJgYUv90uqNyp_YIH1sqcRLJaq6RGMZSZsYSnxPpRjNqfgSgOtjSvQ6cGmNn4N-KOE9pXwTBqs0QjYDA3NKZZbvewPpYpcDaM3HfTh4nmg9T__-A4fgGvuLYFOsmcDDMcQg7w1uc0zt34c3roE0gnWWSf9LpIjc4Xpb02RngooWSbAmxEf8eqeBJqI7RvM295rRUY3mBWIP2IUmHkh8FV-tpLgShWCLj79ZrqSSgWc-5L6TXpJsxg60E27uwF5INZQaRYf1UT9kaEgXzPM..zbVYZhegSEGGVCfz8tzAsXzpcv0cL8JrTyVCzXNOzxNemk0dUhJwKIsXFV3vbz9iQlS2DMbV1AS548sH5vx5F5_k16g_wCwz2QLrv-4G0D_9aMp7h10Xm1-z_DsCIz61PD82-vtDn2Xed7955k93mazYSU-cts0P6ooHielaTARJzECtqHIwyGdF1qH2cWO-RhcjA3tfnj8ssipHpfX9mJu4ATEXRTq-ME0E71-8bgGfbjrDbDl_Caaf9Zquq4DkCt8jvrejRfLJondo3xK_KIav4tzqelJNV6hewm_By20F3wUvPxerBl3otoffiFDNV9PotwdoWIb7434slMP9osyT0pOM4bh_PCoGTzf6RveFcbDD6cn1Zy0XNLFFvHR13A.
Figure 15: HPKE-10 JWE Compact Serialization

A.6. HPKE-10-KE 

{
  "kty": "AKP",
  "alg": "HPKE-10-KE",
  "kid": "UVzPOxx3jthVCg56hBO353HIP_hObFaFrI-pf3maRr4",
  "pub": "9ALOt9bAhXcL6nyuwPy-cqzMgPbADhIWe-g3IFA6fFUeidZ_SDun5zbISBE1i5YKT9STKCBYVlCUZlAo8lnMtbc73bNy3DNkQvii6TptYNmPTXmwauN5qsUFM5ouqjFtwBhQTFkVR1i5YuOynqhC4fp5Z3lcEesDFRQxhwGJlNgxiNGWkNKkeWBVELxU4yUPHUt366Z5_8eFxGxpRALKxrfNamuU5zeokAxmLAsVKZkwfIISxQV6EgQ0JCgApfRXp1gaHWk_5hBrD6WKlwagDFWO9npfrhFtHHNCm5U_FdTNheampphf0LJpdOLL2BGZWtqYn7xDuegxEJCBiWoBoEl4wpMcz4kqIDchWzTAvaCLtXvB0FOYlKqGY_MosDMIfYRpfkxlTdKDxMxWC_YZdTQCW9aGZqu-gqw5RCmwkzUUxKrMW8lVWbRXHsGa1WQmMTJlTLGGRnBP54YwisvJp3tRvzy3y-JXDadAxeK5u9UJIMZLvgmAs9cC3xt79YahZbo8FzIRCQIpUJsh7uC7VaG7f4KzgDZSEIaIqMRKY7uTUvasmiZbtoBMU_GPrwZ0XmFNi3R5bua0ieBu0RWducQaqrlQAPYVfRkuFHkPsMmcFToVmQtq4YlhE3hsSpdVIVs-PEGeKcciBDtJEIkJzxt2tsDPfagb7DlQQmqMsTg5d9K-2FYFUny6n3sXL3wdffoM2kG_XLwmpPERyxOi2uq_rYYazOHBWPxCdPg-bBkWy4uLOqp81vSHx0R-JpavAMEfs0dzLAFYo7a8BEpUcmNo4cciVsoOV7lUkqNskhXCtSeoSKw8zDxCo0ye1cMGNuogZnKNCPhGUSo9igeAcGqkHofMS3B4SJcnHYMMD0QJ7eDE_Hh0cMsT54aueuuJ8PauLHuT4mokG1s2exZP3uaXG1BmPMtpARyCJTNax2Qd1OVqqxukummV33Ja8pdC2zULU_XATzZjBdiQZ6e3R3vLQgtH5vpvnzBHvbRHAbKJdQS_szVihbeUxgEdGSwtcgHNQMMamedO3qmHYsRqc9lPo-W34_CUhyDHq6K8n0kgcxFBI-RmM_iE8RIyfrulMyNPXdnJ1dJociljcSUyjpZIRgE5BCeS7sGp1ZJ6c8w7JhiSDEWTl2OUb9GsbXNLo6PMrIBWkgl_A5EpMipqwgLQPHTCTmIJF0usHcYnMtECT7U1dPQVKgSvNusaXldU5miARrvOn0osBnk_uzPBayCi8DU7chRXMnoMSQlhOmeNIwS6d9RM64HI0oAcwAAFkYyV-pMvqRuz4Ax-EWlHubrGDvbMWTwMNpZOhzNhwDIslaggOoqHqZMegozO4qkjcueLDPBBZTamjdeShbkQfvcSRix_fdphv6sdnXyN7Umr9kxA_3dLS4m0AFuPBACn_Sohc-gLwRSHLueo3vut9VUbltNXTyQSHBzC_TgYVtCBPLKWlSvGhNw5eXiARYI659l2ObeD-8JQFjwN1fEcesBjfXWJKOhJoYbC2dUO6fLKolxt72UU5ZWcdwYjq9W1WEO8z6C1s_QqaDOrKCtuLRCO03lcXLIkKHkwAaspTVw3nhB8_6kn1heCfjafA1lds2dx-4zBechsq2E7l6GnobhnhUp0-HQXuGeTSiO4aamm0tou3-inXpNzuXsR6CYPG2q1RYAlgWoLJAMijgTMRNxtvGSPg1d52qxDXBQIpJOTScQf3fONnHBb5GZHTmiQ-BW9zyhPM5KUEoZ07nx_beEhzrtMX8VZOJe5swcdalMC8MejzOYvLhh7jdFYkeIbbgkxMBMZEkHHtfijFgC0T7qCLTkQAtXA6wKZLgjHwxsWDjsTDuuXglDFxxhv_dJNUXLD6XQe4vkDxnEI3xFBzVmoZ6VsRmwKdZVo3WylBShYO1h8YBaT8iARj8x6NekIPsaFFbs_KOhLR_ttA7ETiGCrn_U_E4UFjCqyGcZPEFvPc7YNcyMi60ujwIh1pWQEIDG8I5qsZwMPRXY1MXY_ipyOVmE2sxUbhWGDrHgxl7Rm0swGBmY8JdBH_dZ7IqQUmpfcFmsztkfIoV36-la8UmqjSN56xacvlWK6Wwj7RTcE5jkstUY_rBwX1kBU8IITnA8irT2vsR028wS2lsVFIVcmlGloIbCU6Oazzm3MujqBobbHMKqXnv9Op437pCNlilyNtAXS_6ZEcLdUIe3wTTxAd5idwaPiZKy9o3KyjiWZ",
  "priv": "uSDPZnwwnLpJ18lwAGHj75e-fGohW7zOWhAG-7DGLis"
}
Figure 16: HPKE-10-KE Private JWK 
{
  "protected": "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",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "iv": "wCvoPwGvxw-Pau8W",
  "ciphertext": "nbmm3IeSWU_ZAW9FO2rLtLcmwWhtb03AM-5XjnpvW7IHiWoqMsgHuh8vkt-yuX7crIZ7mJXqu3ER5-PE77hMfR3XgoImNgSCBu_INNAYHXIBsKEzfSlGKnbsRSHACMXLZIWEc26rhG9J56rkfi-_PFWwSNEVtDMU34sjJapg51OibNjHZNE-2J_0GtijEiowTHtcBUtQMRTxzbquOj2b4jkHyB4pVq9_RP_Ylk8j09QqU-0GdUAZwFTcQosLZ_gITXXaNr_4wJXS4_115STMaZoPuK0NUajwTkoWPbz234KqaJR3CJ-lp-eYmZ7jMGw5sRa35612FtGP8mi3SnsMcT7fgNx7DA9ZMeYPJJQXwnZh",
  "tag": "FXgzrf3dYuFnc196Y892qw",
  "encrypted_key": "1mwnVNPB9c35nB9xmUtxVVCVy7tMKou_2GQD3Qv4mt1kjwknDOFCJqPxl2_7q673"
}
Figure 17: HPKE-10-KE Flattened JWE JSON Serialization 
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.5YBmrPiZeZyN7jih7cTl44OYFR7xpSnc6Zdan2ff5dUahgaM7vhHi7vdUTOo5Bui.Gn2ib1XLLLGoeYDG.XJcfODEt8PegMiFLCho1B6Mr-xIbD4ccqWPCX9SEZo64ba_N_SjtwMQ649Fh_omADXOclkUU9xJmar4-hpTz1pw8Af5joDyTwr8R7UsinczfXKkKwUVHLCv8yD5DDyfxWg3smqUBnGBMi7-2rsaV4oUo7LXByO6D-9EKTmXVuxroIIti8g_7kDljD3lFz2nrJSEu6jd721uQ4hMhUXdrRHRj8EpVc_O2X1QliyTmPS-x4qA1DqHL1H56PjGdyNu7OMJPStyP5OTwfDXDt7N0OoN_2n2kFcrlY5ajZMRP8jQcRTtJjELtYT9gA4xDC9cVw1IlSrmtThE-C-CUWnGGVMueYerxG3sOC3DT31maga7c.z-QZi5rPRjBWauFMl3gF-g
Figure 18: HPKE-10-KE JWE Compact Serialization

A.7. HPKE-11 

{
  "kty": "AKP",
  "alg": "HPKE-11",
  "kid": "V6NuOTRpkjQsIYLTK2V9EGxv-rDrdLtcQnlafpRPybs",
  "pub": "wNIn1LabsWY4ndgJ0ZKD4XAojPR_BGh2zCw4HgFBH9uQi3oqvWMq9cwXsgdDsZawObNPh4OzsQSS-Sll0ZOhJMYbYzktvRJNwJcYL_g_c1uewylTenkf8by-duxeFYk6HMtU4isA96fPDvZypdwWDYga7uW-TNVp8KGK3SlZSyoK9kdVpoCDvCpm5_o4SZYCQAWtxww6BJlqkKcI0UJrBZpGR4d4jpcB3UwBZXFuIZWNxjVdeglSCSdSCVSftzsFJCKovpJmIBZa8pgrsWEBhamEoJYRmToOuCMe-kERcUsBCVqAoOt9cdYkCSJrmlK0HGqQtthl_JtTh6wsFjkJTHYkrpKQmYWOH_s-B_Zx-ksPSLAek6iw_TQRmtZ6HFOOiHQeyNQqrXISIVhEEUHB5ftE1ytVxDuI6axdWtAfV3gfecrDJnIk-4eMcsSh7iQ1vNlo-NIJWBBcWjJXm1M6RjEAgEc_tOGPLNxV4VO1YdLP8uNHCVWJJwFYTYeMXtVZ7BfCMKydDRO9ivcyDuBFh3MiDBA8aqKcHcyIJek9PhBGM6exwQumC7Z28lYvWUycu7CpTpimfGlghMI8iiZVQkgKBrV0teQD1jYrqQa5eaxSfAsFH1YBTban_mtlJvurW-WdcFOK8oY9empKcPNcznloyoAxOqfJysFq7dozLoS6PPNcH2x2HbJseRgAsXOYbIGeKsFBehuKSxYqaVoctPVddtdNEhKHqKCTDMY5cDpYDxoOIExBIGpu5zHIkKBZwwKRaEOODLk5O9E9TpQJDMi6dwiL4xertFjC2vNo6qNDcRepGiK0C1UTbby8R1nEyZp3ISoF51NbwFGfPhVFfxh5D9Z1oCRDOuzIVSAs8jNdAwNpddMecIW4pJWuZ0RXbdyfzdmisiBXb5UUvzO0lHiCDmN3IPNB5cgwrIQiLkl4KcWYiGF8O4hA7Mo_mGbGwtaCrSrGwCU3cplT8plOT_pO2RgyfzMFgmt7s9oA9sqZnDB9VJMk-IGKFIWV-QYsuwS9qPodyLQafoGHQne65uIq8lsdK5d0sGKAhQFwLYI0XbiDjEt6lJV76TOr42K2yaTOhfoNiOAQGgKHRWWpuVCSwCrL3XZHv-q4SmGPrGWrh1On28McddsXfLWD-GuTiGoYJJozOSISnFlnZEZ-zihe_emQALO0HKyrzrVjLFy-F3YPnPVfC4iWG5KdDAFs_2Nfh-LF0suitMFleEUmQFwwCPK2W_Q1etlo8ECBmeFk8TFifXorFkIW1Vc2fCGD-wvAlKVXhEBrtgINgEK00EcZH3cpvkxeAtcFaCJpnUx2qhFvpHgKU6JqoMIxgPE2TQGOgPCpKIe4qZUT99R-kME6yNdxqRAxfHQ9y4ef6SHEQQiYMGQbyiURA5QMJ2ZYtkoH7BQcPXRSRzRQQgtfPuk9iaY99QmfCDlHRyZGm0soSKSB2KIhtAJCoTKA7XllzNV_28supxc8L0wDDbDKCux6HqGyJ2hTxylZxkFygwA2fxpPd2qWwFEIFASg12R5TQX1Y2OEaepEPcgZ2ZboEW2_UESVBRkF4VInSDhTJG8",
  "priv": "sPTZ8L24TMpoUuKDohQ39bXUSba6Z2AEtkea_03lc9YhLDVA18OIVpKzk-UJ_cGvxQtQAvQ5RVJY3eiUbladyw"
}
Figure 19: HPKE-11 Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTExIiwia2lkIjoiVjZOdU9UUnBralFzSVlMVEsyVjlFR3h2LXJEcmRMdGNRbmxhZnBSUHlicyJ9",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "encrypted_key": "ddaMycqikk4t6ASaBR74-6-0IZOiGrivbNObXWYm_nFpDKYQ5bCXdJBW036dLN2npf1a4jFI4Puwxb33kbiJu-SeuY6ueWNYp2u6YUbW1lwRfiN_sEQA_aBCN9w42ap0gLMEAhBGjx7ZApGH5SIKIC2STfw18e3T2zpPRXYXkzyb5E4XKzxkp69amBSLaCz3Iby9X9j5uo1nsSZpMdgCMFENiNiGF1hAsiENI0-nzY_OVg46EjcUcbmqgQfhwNXmd--tPJnxuzrCvh6BG3j7aVvV5wN2W8xO9wkwxW8ww9nz8P0JMGL4N34u1K5vDg8q0BmR17tdXQz3S2bg6Xr43CI5A_yyfZYeaztQt8_yhAikvz_thKC_Z8mqFD6jElltI3wOny0xsCmboDbZV1fu3WLqnG9FbWd2chU-9orqM-S4naxH3finFZezjcY5bwoBBzlIRxgUcSwxWEasjR_dRPmWU1MJt9jdIw01RcjiGpgSuTckL_Lh4OcMs5WOjDobJRWd1iX2N7iWy_oS7lvJ61bw1MpIUAkEuk568yZXlluRlxjWKxtXdE0C3DsHIwkZawOxblxZumZ2P5YMX38BRhPmcAE_t9q0NMMXjWvzlVEQZn-Jtn9wewjY0w-3k2T-MNI2BfbejRVQumt_9qz9hXzpGmVYUq2rSt7dvdmLs9gibfTKI3vwXTAbsGdeXWcyX8wd2Um1r8d2jc86PcdUojoMbjg-2eEwuYVppBD6Nza6yu8BlkALIWdlQMYU3snyw_eWHoaXL5D4jnsPqnPzlzfpZaHEt_hPJ9cAHqm4Xi6RZZqWczlxPrzNRvMynDi2wie_NOBEbMHqz0n4kM1dbUNeW50nxGyNiv2WOOP_Z7mLeFkZ9VxNoA_D311BUNseKk5LT_i8ME8BuEerk8tfaRnLuTGqYKPPMUktmNDRLBWHPPa59pStf5_5PwlUjqMPWe2i6L4tnoKz9F_FkJ9fIS6hK7LIqIFSC01FZJk7KJUgIKJbTbUzOL_-H2UuMwM0h8_VNCu_X5Ow8nwLNstG3tmigSzt3-rmZ4JZQLbRP3hia3QoRfAnNC59KXIduJ70Fe9wqWm3poiJTqirUf9ounlMxRLPWEov-zw648qt1kY634f-o0ODHbKsBKML4WEkIDTwpKgR60wfyi7DQiro5fmhqJjxjWt7f2hgN6dPj13XWFZILLWO5XFpCbC46xIsHHMiTBUL3VIvG48c-12PNxyOYCZtpNLFFfK75vKkV_Tt64RorO2uA7Nx3e3ECslBbmtnaEy88-bm85p5raUScPl_w3aRqFe3p-3pcFmETJ1skOBS8o8MPo4G0NJ3r-4XVGdJn8vH8f1ct-aA9tbTcnFvWBnKas_r4MVU1GP_Bwyb6WD4r-nW8Jj3s9TVRbnO3ZfYbrg0WXteeNsF1BVR4c5bZ11ln4cOzwtFMRbWBZo",
  "ciphertext": "2lK3A_SyOh5nOqEgFeGh7Mk-TAqCyVQs2izJjAhN7kVN1QWDjIdblJ7oXzVJ19M3lbsWIsszKRIDzjzAzdPcYvokLgobtV8VAC6Jd3JlHC3mocUfMdmnLEh7h29Eti12ut5tQm2kNGlhPuVtWTrBVnUcfbD94oNXv0Gi2e8pIdF_kyQJxfZUamZRthMUGHLTun-Op0VmeTJNybg-8QaPsN2uPj9OILeWBjwx_gcQn_Clork9vqP6KS6rToJf4BnDnfYDlfRTg-qX7fyr4HUHZ7srkx5hg1rcJobUM_MrGQ9Ruo5W6dVMFD5QByKklIjhLdyE4KeIVF8BoRiGPSD44rajqO4iel1LJ9pwxjbMCVNeN_oxkSdnGX8PnMqFuibZNw"
}
Figure 20: HPKE-11 Flattened JWE JSON Serialization 
eyJhbGciOiJIUEtFLTExIiwia2lkIjoiVjZOdU9UUnBralFzSVlMVEsyVjlFR3h2LXJEcmRMdGNRbmxhZnBSUHlicyJ9.057pcynytLWqRenvuoSUUNuOHeBsbmZsLGuljeNwBX7swSUoYomZ19hdsmsnmnL_6gl8xjEb_14eG2ptIhHMqkZDtssiz4nuDmaj9FaFh9n3dW_y2BE8qAtl3ofpryXrdAxgyJToD2sILEfwEsqDRpAZREG2WGJDP4wb2X1PEnPdBO1oZunlHnATDDK2I5Zs9-o6Kdn48DzXFTWaSguGMWvciEC1kQDB3_iZiyU-MC3zMqf-dQFiefM0TJY6oZ_6Hfsg3_9p46WGTvBO92ZkP0G6Qew7aUSsukeoNjW5B5wkLxss6DXa3hJqFmWQ53qDIJR1sCI8-USQcDWlIJdpghhlpDdI15ySzHEGcFQ0NTPJV3gPzJu94zP79013_53f0LdfL4fN_9rf9JF72XZkdkBkRuo4U4yff5n6hgr0LFVeEM4gu0qx1OihiSjg4B_7UAW-aJgZNh4-IBFnZNzz0vfV2xm-A5YXqXIYs6dllF50HH15gtWY90Q5--VJzXwUT08PcCJ9eIAfVj0ob3Q5oPPf0DiQ2N785gN2roClCm-utoYjk8qyIwSOzdIajH-BpmguLVHL57X5cpWQ6h4fA7h32fQnussK2Ubkz_XKuP9J2-wxAtbP_CdQ31yhcQTZ9zcol8tPL1XFXoF2QL4nRlSw2-5cZkI25mmxlcKanw6xshkU8cQkFZhMJV1pubuPCDYV91663ET5LJLdvxo3CedA3HgIEraewpV69IEKAYpJ5QgGnLU2CakoxHHfbfW84IZ_MQrbXtew6lZceUb9bWLakPsSk8dQ6bUEYljBM9XiPyfraBpDtCPxgQDs3Y3GaUk6KUkpL1wkGxl9o1gFsf4P6z1mOA6GcK0oJs4eJT19G17NZ-0MsNu0EDgaRYx24vu9HIShjv5vCVcm6nF6YxXaZLbkBWfPE-1OsZe1n6-5xVJoy7OUn5wYbyebIlQ-apj3zpR7bghgFCzRbNI8rt0V231wiJ3gGkVGUJs-IMGxznSO7IxPVfuKb_In0jv7sLGCWPiEVyl96ohKYL9NZWhO4rfZTELUHcdWszhQU03hGV7Sh_iNIe3CEqXyXupe7NinWUikZjxYK7GpFcWmN1rUpHXDNO__Xl9tCCXPT8lkOjyufZd3xBWk5qOZXDRDQhdlABMDLk9CrMwdXPFfaB1H1hli1RvBGZxXGlV0ZI3lYtVeLXx7yov5IXr9cN7zPMIofk3Wsp6mLLNpQo00aeWcAn3pJnS0hyhlg7yNYSFp2J36STCtWay64ks_va4DczSCW9v5lvgr9_XLH9e1rq1Na2e5OLM9USkoL_KzIyJ-ej4l6ZTtra-qAUJeEvZAYkO0XXT8de25ePogB8qucxxfwT_hLizcp3MB42yNi7UIt9_UBitwqe15d-uvDRyIF_LtklokB7LRLEzU3ZUx_-QRmAVLQx0Ya25_1qn-_Ew..V2j2xCZtmftoPSWxzb1AC_cO2yjn6ZmbcalLn73Yalu2Wozsv_nGWCExRoJ1Mq_oFdrP1Gya15WiSZPNmrKAlc3bBM0rTFRyDCKTmFRYT3xIzChK7XXR9bWNja6LzNEhHzTCNr9gsIh2M2c7sv2oQO-Zc5Jl-zn0dOI11UTlBnFlTR6dnbyuvtIN-I_GhJew9f_v4SGCjw9DLx0QGs1LrlxkePZtp9ljlcssK3E6AqEd61e4W97ZAmBlLPGsv01eCBBzGXOT_NIFMR9joH0yBrIZFNEcrSa0aUOfHp2-sVA-ycChrsMpwKvPojAo-DTuxV5mFLQ13oTv2Jg61enOjReaHdZJbPAKJfUMB1s7GJiLw0gpskWHsnTNEj_avPd2cw.
Figure 21: HPKE-11 JWE Compact Serialization

A.8. HPKE-11-KE 

{
  "kty": "AKP",
  "alg": "HPKE-11-KE",
  "kid": "HZzzLQ-Ih1g-LYLZb5DT8lD9-vP5pG0iau72ZZJi-1o",
  "pub": "ZBAfldkm_AMwe7hToFqTWKwgbGgsEdIcijiJrLGWePx2TPQf8eRV5HSPUXpmorZdMRpBeSVE7BZwsjYiaJiWqWJLtSVcA-sU6xsuOGJNHYQ9QKQZPeg1Ysmm9FmYDuOAzGwZIZnCsLEulnGQJtG9osMfT_mXimZPbFhf2emgjkcXFcJ6Q6JfK9oomfFB5JqPvHyKRpQGbGgQpmExDjyAIgqnddCEcDqjvYKuktF8NBp1Poe5YWMKh8AY-FCG7Zad4pK4XgF0U6lXBnprM4Ol6WuRODJ9wdIjtzW_42oeApwqcpJildcBmzstFIi5sjQNMPRBjLkCGDQFIYJL1fOfVAC_EvIfAEc7i-m88UsPixA3ZVZRr2fGlWNBZGQeYvMf3-Nu-RypLumqj4Il8QCWutdFFHWg8WpjXduyYFRtrONv2lY6Y5iTl8MgTgB8dmIsfFsY_qCIFEmF4yxdNGo7-PBx8MyyEcdqqkgKKgSVFgel0RwFD9jJsCimyOS__RGvy_wxhskgieqXToe73PGJdDgVVFRIYAkmPfYrxUjHc_nD5zNAXrFf-fAzd9GGGym6hBxIU0kFFyGRFSEfaHha8Wgbq2vMMCmWjbEAIuGIpDbDRDSUIpBTjtAnKtRcXQAMiJs0-ciq2fwlueIINPdthag5q1G6rjBUa6ioXfUm1mi6qaJ5a2yUfYMpFNBRe5A-phKf7pewH1i8a4l2X5YP1ru5v1MwcejGsioHTXkA21CQIVGnVUiBXcA8Z7VlAySDCnhkuQQf-VsTe8BfrLgQlMsQrHdadUZqOvWv8ytw1viGZvw_hZe3I_EgJ8aAiXlHQdOvB3iQxlRc2QXC6hyjhJq7PsyZshMqj0eQE3CiUQYzqwuV0rWqxaY5-EzP1oRK10vI03VJTlOeZSIKE_g56PE4ZwhuUjHDqOCceFqNjCW3AoOqJQQd3nWXzjTLJ2WdgeeQOBUnDeOMLURfJ0k1osFxUXRjWKpcI1o9XzFoTdZcgtqLczK92mmfIfJfiOUC5tJwz1Ga4edmxThX5XdanXS65hhMvtpSE6XM51s-ass9fJSon6cKMMo8kFaxIpKI1dxILJJvsmdrFyRKPEtK3YcbiPdjgcSZjzccTqsstUKl9GBvFNqWp0I8ViFcgbiREueQWkqo8iGVfZtcxpzEMChrV7C2baxZRtyCiUnGVsuCHoqakyKYAZkqtRbKv1MZ-yTJfmescJy-WngHn2y6a7wKgOrCfIpkkpdL_Ys3cqAT1DRG26OgIhK4dImGQGuuQcBcxjQK2ky0AKBkhmdEf5g6s-G7RmBygrEd-HVjb0pVX6BageBTOdCwCJQN8kefEFRebyA49ZEi7ih-WRfDs7sCv-B5aAkdpMS6OKUEGMG8mbtW24GhSlyDnaRBPlQgntepnjQSs5CNIJtbkNTL1tyX9Pp-hIE-5aS2HAgh4oizSVERbhZQriWgM3xa3ZRSIHZZASNOj4lvK0EzJFtFmuzMVTScHJySWGKGYkGM4YyVRSFHreKCZXXOk_YVwwdRhF1pf0Zt-oebnILWgYVHOKleu_7M0VsK4JFAa3AGyJ8",
  "priv": "MdEcXWCxn5WaIadTtN_vZxqueTEEnmMN2Ip60Xjr0N8FA55JM4Xo8EQcFnB2FZy9Yly-p_MKUqVg7VIvPpW78A"
}
Figure 22: HPKE-11-KE Private JWK 
{
  "protected": "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",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "iv": "FOaAyPWtrY07P7yH",
  "ciphertext": "gGHn1gnV58uT3V4CsyIL8lXxZPoFR3Ttew8yw8rZPGvg_OtVbOBqK9Xoj6LTTrd-by_tEXvuNGSp8mx4uJMSfnqBBW1iOo4WGsoGl1lh461Mmy3gr1eu__xMzZN_v_R4wCIL1Qv5rqSLnOMKs7aaVEWiz6c7PmhxiSj3dY9ife15Wd6I8i9IcIepc6i7z-uJDkBTYWBPyNHtxA42qW-Iwh9Xki44Viv9o7-D-XJw0EnjPDjBK-vFZxSs2SulImYUSJ7ITrTqSzLeHuGY4O8l1yW2_ozMx6-7ooBM_NVslPbNVZ7wy75MRkRHkdQ_YqMZKgXqLBy8RZNmWTc4WU6qAuRH8_QZ4ERIPr3beOpzbi4g",
  "tag": "aOby7z4SdSFbRK_zidJIVg",
  "encrypted_key": "sIF2kIACFgTqU1ymQg5gCib4ikPe_OnOEnH1VeADbl6T6aGbJ6VDbGv9AigNNvzz"
}
Figure 23: HPKE-11-KE Flattened JWE JSON Serialization 
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.bqhBd3KnS-clRN9okiSqCne90Qabn6tHl_jzTlcvja78URZVspR9ZiK9wZVYwSOb.bi3_HJEqX83ooB61.nmEa5HZ46u4tmv7ioYubuqAwQ4PSNbx8oqAWWSvGE0t-G7QYd4C8sWyLSDBSTmJK-K82Gk7M73BkqfnYGuoA0iBoz_T5fnHaX5gCxg334YtcaAtxEhO1bgkF4vNPiPo8d55WJTdLn6s7giC3mKv5YyMTga9ogMxNAMU83CqfljWGPyYhbr6X6Vfc9uDdovxSyF60CMRSniWbelwyX6UJZnDGwM-5vVOqV4bFfvU-p0M7D18LjoXTIwR9pBQ6jHm1Li-YNYyITIee9K4W9BSWT4JsPxggsQqIi6Zt5P0kats7vCTe3j-Ve0xOGCNw8UTaZR-Kj7JBniA0QkC2g4pbgHgnm1CZBgW9sTTsr-Ng5rti.gKn0ZC9zMootkKtUK7MnHA
Figure 24: HPKE-11-KE JWE Compact Serialization

A.9. HPKE-12 

{
  "kty": "AKP",
  "alg": "HPKE-12",
  "kid": "UZgqVMOvJ8Nd591kVluTxG375m91rfszVGvmfSYy0ag",
  "pub": "yBjFl0K50OV1_xojNbsrHrtYJLA6PZsZ-BBE5dmZ1ZkaXCYqi2SNDRKw-pwmu8FdYpo35nZ-pVoZCGc7O0k1q4Rb-AMpJFA6xZAYSKh0nyNHbierRxx95libUody85KwlGK90XZ1SZtitYWREix2HGF2uysI-wNzKLaSOGkbc7GGCEy71IZH5SdMnjEKB8S5HopQx1ouwQWmqHCzISSxM7M7ymeKQrdsB_K5aiqfQecc8El4CQox5xWA3FglxGsasEwQnlPJkzW0v1jIMxbF_MRtGpcpU9Vvd9h-5UogtAEVITWaDsfGY9uYKwpNYlZMzZYGMdcETty8rLGsiZqqcXI_TTJPyvN5aAxwf7o6FySV9EprtUIiFyajXDGXVveTzWlmJJKkkvdMdsUQdUwD-eu1Pxmv7MIi3ocHoplPXGh95jhExCarXzKH9eh7TvUP6RLO_royJSeCtKiQJrcHb4MJEbwJS7DCP3RwyRZAoSZRwDYit0YnK6IdmQgCQNDJB2h6RsoEMinBsAQvlPZL-isnmNgtO6Jk09ujyTleRlkJtmUlSjstOBU64UoRjiSHhipEi-gwbrnBKGMdXcMgFHIa1IWTnIVQl5xejJybX1p5I5Rwi4wakhVDE1M9VjY0AOqSIEeXxVlPKlFDZ6xn7GEcJteZ8Wt43rmdJJK5ztmT2BNwGOhB2dVfofmOMqm5SsA2XWtEeKecmOe7A6h1Bfqh3MIzQ4c4RnO3zflxzFIUcxRLFuMFsOMxQKl1rScn9Fu77Ptd7RQdLua2YNpIshicy_kr-wusnjm5rEij7EMGkbIslocZAzwxWeuIcvQX9kZu52W7dYhspJwDQQRIF3w6uBAn-aCcK9KjQIADcvS8g3RmdVJmhrIXQQBB0qaYpAGemItzf3e6fYyMGxMO4cOwrXODlmnDLVYSOLcQW5J0_mx6TyyIwDuDJWRuUPipv6Wf6mmUE1ST74wEbrNoMgCKsRZS8Di11is1wsIhr8yZfUmWdXBsi3GZiJx9thBJyUppWkEBXPlsgFB77kRoupWwzDaWQ0B95TIt0qGPUGqGcGejOeZOW4OhD4oCV7fCX7yZn7VzggBa0zVC9XeHD1qlQhytKWYwkjE8G6AXi9gOSCASbXOUBQtA3PCEzOCPfBUvspweDBpRYlADDXYvdZmnssFiSFh0VzElkNgYZUc8bqeTIJySaOPAMvN0HXjDsmQfHboIW8S0y0G7frpj13INuyJfr7onLhI1T0yxaqvORAulZid7caExF1iQYIuBscokG8dFsPGG_zRt1LQni_N0_5NTvgE6kxAB4pOL5zGmkdOT6mUyahKvMFdO2YNMLZmm5sQoi8W-rLfCNhKnfVxYT1ZOp9ZAAYat1ek6DvYEDhNKQ2vHItgUwkjKv-ssL2FDnWC98XN01-SXknoBJ4wChxxwfGhnqoSU1RoFUTFen9c4d1NbtXp5IeC76Metv9osRsqRW-hwOvXNLVid2KjHglimzbQiEyvJD7h0KaFdSTWZE2qQCGhwQbsaDHUdqxI9_PbJu4yEyjOquXew6eebVjoZmOd0ivJuOsd_EJWu2aADvkKdcAh-npMUd6wslxWZ12e0vjgZmpg6u4ZJEiw4wCNHRGN7qMq3JAxn_EjNUsqyH8JfebqYPlYk1KtbehGy_ZJavqMTWPRKINdkVLuvUbKWz1hHgRiyRWwNMvafmIYyV-xCn8Yhc2HOWzgpUMAJYwc9JvCoBeVWxQCtczVit0B7Q2BhcTTJrgkoebqSkPmjxwF_U0e3PiBGHaWvs7Y4QtKOm2arVMY2Z6SZqZQwI4rIgjBNtHcbglcuKRPMlkaVG0TIEdh6d-gh1ri8CuiwN8cIYEnJSrJ8kNa_dNAXMuAmt0uGkHktm3OD-OhilwknRidJ7ws4ynCYbtdjhKJtAnxc-aoB9XCVFFAYVDmz61dPNgMABehnCdotfVXLdkEls4IOmuFvoFDMYPVqOQsZOPNjL_O8xHkbS2nEjbKbqCFX4pwJ4HRczjE8feN3JVHFatxTcDR0xwujTmVF3KtPBFal_K-1uE00DBIUSTEIbZcuRYUdkkvuyip_Rng",
  "priv": "gfLKhy5tdkQyMbtlC3GDiD0z9lkSd39GfZqzf_9YLgsQzqE4QT0Grwj6OM8LGuxu7pEkc0UESxZHeT6Q7blKAA"
}
Figure 25: HPKE-12 Private JWK 
{
  "protected": "eyJhbGciOiJIUEtFLTEyIiwia2lkIjoiVVpncVZNT3ZKOE5kNTkxa1ZsdVR4RzM3NW05MXJmc3pWR3ZtZlNZeTBhZyJ9",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "encrypted_key": "4QdPF35_1dliHIe881osXvTGDls67sNUDgZKia56REIuDgFfzFdxhqzmvg_if0bOaxqRs0knn0vkDQL_ZeeNltHJ4Ft0TXa2zoxu0eMYh91IAxGTdArSTBP8GBgi_JXdalsEAC2ejiRYjfXqyHrc734RhpS9jy0PQfBrGGz-a_CoRpMA6Fyd0TPRZLcTvCBN6U99l8V2txLvUAqd99jBZkd5MWbRWbVdHBBnx4cNF7P4lcfRBJ3PJAikU7PWxzbzNU6154S0XZkg29T0gpUX5CTSuoGiWBfUIZDXaAvYjlgoSBaB7FJwFDA2pv4NcdAaV3p5GP7_P930Tea1P9Zu1TUFfh1wvPwwd_LdmO33ADPLy_rcMDPY8EXEFQKUIpPEG3AY3B-cNZEBdjkKdk1AEdEdJbTwAUtSf2LyOTbLsIrvjCfPs-Z92tTucX1ViBYdSgF5pi9dOwNFxxI_ltp4esRBpPwtkIbpPGDfBX2Uwggz60ZgO6pZ3zWJe_T2iQZfzi0MXKn2HQnVsABQTU9siHrmqBVODKDLr1D1nblx_x_AoniqH12QSCmm-q1ZgIoVzxkzwtRgJieSdzMzumVGhv4yEqtDvnayJ-ea7awaEeKq9sqKkqWoOxGKFOL_I3ZJ13eNB3aTpOK-PVkSeHzcTUtxzRTvA9FVXwQSsqCdgIaaU9QIj29TSEqNzYsReFvAnW4I9FxMBOZrJ8UGFg_BZUBlKBvgTgafc8MGr4relIZWyMLWwgKIzh-IA3Ar5--y5eXud-NMWKA7kcsYDkVbdvkARqfMEU6cbOF9TM38RRJrA89dL1SwBLmHWeobYFSQxVXPYxocRsG0bbsBXSHhvJjb1FeeelwNZQq0LJMahV4oowRpdN8Jp4_WUPhqRuLeZXdQvAZD5Btv3R3E4v241pDzeKDuzWIluTYc4egutwRseL2htGy8e3sdufA1JYM_HI3Ym099n3oG_q_GlraWIg9Z6UDgvFpTieE6FFnk6OxM3Ryfrk59AlHffNnTG9O-I_cCdKAnLsgq6S2kJEE2oUcDu2rj8e81rrfr2hsHrltv2oti0VbApb8do59ogqIugR3nr9pTqa_bORUWpLOpvoLClVFDC2YmErtZsjNlm4VlLGygg0GN4NmnM74PhMKOPKIf4qYbrWb32q_9LdoB5CkCSX86QiJ28p3D7JnWL0zdFnIjKxPMOFON8j3ljBDUstn-SpD1eIF1eTD-C3u_PKuxxqJhyXPclgpQ_7Ue_ZlttpCzpfbR9mHZy43aD6lUxjjp4YqjbYjh4OUZ1s1JxlKzkpy4klQnc2mY7ZrKzK36zpOpq7dUPERhZlC9q5UD6WAOzHgyJIEkNuQN_tx8ytXU4509wbnZes9gtv_9EP52CdwsBdaP3Sfj7xP12r11y2I5Qdc-Usaub8wUmyWFT0hYUOFIM-uSmwIWTYjHq66HS22k8VSFpE3_SuQTn6iYmKq0CbD48jcy2uEqGUpovAjbxemlbcvcph42rB002DsiwACorb9DZ2FjSQmIlM7GUWaYtn75MZRoWP-TLhiVIJTxEXgM9mjHSBue2R-k50CQLFYMt1eKTUePwYz0qkaHK2O4yugCx-KCu9IkC5iejS1H7hqxePK3jjUp4pl7jxlQFpPf1209yC2XLdy-QdNYXBPGFhtQmEms9vVIkA_2KNVyuOiNiIms66xHMckqFQhjFoAVvGLsQHVBgxtS_qifn3IuyEUFnU7hSjigYSG3XknvOSxzR9VKjnk1wkImJOShNy7QvNcbaAGwzEM-58lkxdaBl65SjEl43HZqUhYLw9v-Bbu3qJ1wBkYiJ8UqH_YW1fkxLrzVacSIG2RD-rs2UvpVjUemF-tm0gJVCVbvOFLpvRiWUEdpSDbGxOHZv-UJmUndCPqGqF8SEr_JXE2dl4ZrtrxtY0bMh5YwYRWmGuAvuY5SGaxYiWkEC2fUo0XDtlTTr5WKND7LREpnMdgVMzbPnCrAh481xQw8VUtJhU7KXAGoZArQFqc-EdEhs4O_ITkTZj8bhMrxjr_5-JSQP4gzhX0WoOGyVShx2i5GhUw_CP1WLkpExHMLMePhRjQ",
  "ciphertext": "odPrcGKh2ZNLh6wldW5g5Ti7vNjHD6ka0AQ4lj7SDGCtCXP4UP7fwhXJm2450D489jN7AaAXh7145Ec0K7C0uuV5feccSltC7ObmoUiiFu3bXO--NRsZpWZvm5Arbk7gfznpYo3FB6Yst-YwtSMUMYRD0ZoOO7F-k4zW7pvXI1dsBDm6hDItgqGjYQL1d5suocaUoOHEM11Wa9a9hltWYk9PVE1KrxcVbDOoDJlcLNgQzAbbDQBHulPAhybiARo0D9pWNZE4W3LUor5Oaob1ziYO57jOiIjWuGgZ3iaAkKcNl-VEwteyEAHpMZ1njTqdFsKEC8OcQuBqu96AUXwipLpkM8opdKir4aj8u49YwfZNic-Ld1cEiZ2uAjP0hm5fCA"
}
Figure 26: HPKE-12 Flattened JWE JSON Serialization 
eyJhbGciOiJIUEtFLTEyIiwia2lkIjoiVVpncVZNT3ZKOE5kNTkxa1ZsdVR4RzM3NW05MXJmc3pWR3ZtZlNZeTBhZyJ9.hfiBsKBDKqbClf9_OE7Volw8ydrPH7nGhHnJw_gtVCsB7uzkC_GEshUbrCJr9r93CorWOJeR1w95-2MFPG8NFBL_4ASSuduHYARESxekxFLhz6_Z0BvGjAmdYlX8X1g1zs8pJX3Cf1LP9SUjKim_8JiRw9Qm1IlkhQiVQ0rck33VBZA8U4y3gJRSLElkIycrsF3IFWFi6fVGVkdxN1r7AAZDGXrBwDl18Ej_ZOk37FH02JxKDuD-Jf6a3vyYJmWmv6XU72q4LGrN3cEomgkOOvcdpQ_-7lUCauUvVe2ui2_7fkFQ0dxMzmloVMbbJfZEysC1HHVEJkvY8jQGYjyRohx96L9LH58d0mb-R1Z167Ri6mG4WyM7I2kxtcTexHVSWqR7NPUy-a9Nv1lnKvlkKOlM4Wh6WABc5lJIecy0AoJKilnMgri98Ra7gM1uFMhSmiY96fKhBuA1XLC8tUpftxTwe5vUcTQ0eU7R8cgnhFz7UQugkgMyGds9MUMxG7J8nI-LwpM0H1DeD4am5nP645MUTQWbEavdmnfrzaf4SQ9vUypRVpWKmadF2a5uYY_0sGb5UdyEfeWoEJIPWNO0JSgxxHmVh4J99EXhTplfeOQ_Lh1zh_haGLm77ltSvLClRXXG3gQ54hle2K4k5qQQ4ELYIlHqTGpWJHWKKSVV09wrFdyB_hhLHwXG4a2Q_Qm9d0xY6bQTXiLbeYQIpum1FbTrK60LWoZtSPPQQXNa_gEzyOuhFlW_6ruzhNLIhtSn97k8B3cp_3l08BCfE3IefYR9UV2FDkjPEShRPPFbB7ed_k_0GA7I36TWk9bvlOoN08Mx7OARAmoNtcKX6QOHEgmNWfPxinDY_bHT-K2vzogC7rSRoc0vbpRVqiepwAaIQUWM62e7kX5VgrdeSlj78jDJl5hN1w_zYYiiv_VepeJTY4AMvGUHK624dRqKflJ1CaciFgVv9YnswhvYWhzux40HXkprGjbU6sgx-UhlztCABjYjNU2gCySu_gqFT0MZsgDC0INUTfog7gtLVCB_wvLKIiG2-s2c4UKJwGz1bAy7oo_EjbjT445YyxL7k7P89gFBWDvyNCT01kHNxFgdlNs9IJYQXwUivyqTwVeN1QlgO2No7x0rWkdkDyD72yT7Z9zVUYmNgBweD0F2B4FreySiIel0EugP4jAb1VTPazOGwqKIy0Ig_aOYzrDYve1t1h8pjT5QqowqDPpHAJ8k1Qetc8W5URHkC2SosWudn2_KUMpY7pgn0zxjt46K6000R3tUOWP3iOn8SPTvTXvU9ck_Ca4Ow6JBHJBigUzlssTl1fDpxBZc6GXLyQaUDk1giQvLeho7WaRXpBCM1kML_S0ZytAG4n0hTY3Jnh4mwDZctIkm-rxbA1-KEf1y9YXD_-E6nQ9kUJ0JxnpcxLswkandu5jag_CKgMMFb6dHcEhEhtT0VMuVYViJcA07U1ghxrbEH73g6IuvR8mx4l2tFRTCWR43_lbrBxcckTDmkqHNwNnOvgCsnc00KmXO4f13oWXru0xPNIsejEMNNAcYM3zevpLXY7E1l_bIiRAT7HAhpwK0MpIDv8tnuYWWzY2pGi9eNo-v3B7WfltFqt7JbZXtSrCBit5wi51y-nIZmGhHWiGlXdyJB3RkVm2dLiVo1lD5swMIlDEtGqcA7vuI3UNLtgpmkaVsmI77eXhUt1TSGHPmo0EvupqlGBPfycRvOhJxuGgx8fy0nm1zgihKts5EcO4lIpccJ35twrw_SDoPHq00VFDMg6M92ReZYQpLOBPtBT1KQFdTYQDpewDipsA4sYFt-4oDz6Qlioklvy7oVIq5FNhXmHSj5_ZvwRAmkWMZmkMvznT6hZ9K1N66Uge0yKaSiucM0SGDxN2TQkEdXxhsuFPFXpHqzvSGRsZ30OnLLMZRBCmE2A4_J_6SjQGPONtArf7KZYdzKPKwm2lIDRvfA2-3j35p8wcNBOMu78FneJrrFD_J328k16HT98rrQ242A-j_r2afqEV1qpLatAkUtLvguPUXgMk_w8Hfjm8sJh9XnaJ4RZyK3KmQeDmEffxTThzzUswLL3T5AFI..XGV-Bba7uzC5GDS-Ul4lD-b9McjKQPWmxopZscK7wkNl4Ba7fGfd21-X4cxN1LDUp98uqcwM5AlrSI_drxD_QFy98XZOAu6362qYZ1MlidAgCGBduyQkpNY3JZl4E0dlUe7MaPT2OMOL3rCEwjPHVMjEOI8yiublX4vtpctUKo4fxD-UYvjM4rbnikTy1imB-9m2pHBLGppVLFDW1MbF59drM7YbQajWoAen0SeMk9VyD40Vd5wIjj8iDQs2r06EmQOh5u7zLDBzpF7d46cV__EbElNGsQvvVw3s1Hy_ce3AkVP9c18ubcvqDaeExVt6aERhQP-j62Y4N3WvoU8xQc-mUr6phBhhmV8VAkDHv8u5LTT_1oPqYjUqxwyANnGl-w.
Figure 27: HPKE-12 JWE Compact Serialization

A.10. HPKE-12-KE 

{
  "kty": "AKP",
  "alg": "HPKE-12-KE",
  "kid": "yEnDeWf_V22Y-Y6SP5sdDhkP-NHrucZEKC1UwW1P4CQ",
  "pub": "mfav6mgg3kcmTrF7B3pojMgv4qZls5WGR7Rqr_WinpVGhNtQ3tQUFNQnTik-rBGPYsaT8TZ4JLl3OUQyWqTAdskLcbrI6BA09qh3GjZv9Hx9MDFnlcU8bspBARlCncIr0zqJTvSxjziEsnPFAE09ZzC6HcW9tdtCs_V6zYq9GrnIEdk-FCVzt9qqRdk6U0i5vZmLvgsZ8hiGTJxygqM_edAfjyIkY4mYZbuX79C9lZpT4WSt6yeo45xFpCyjPdZrPgO-5uAUNqOe_SkLsBobGOIabqAmPGAMfSlswiKB4XSJlGkV_4kA9qkCUfd1a8DGn0p_xrM0CrAYcdzECLpVq0piNHlvupxhcxSLJ0zGwwciRygP5uZRuCMYStttGaN68jyPvOhz7eGY5dkl50GCEBsJZDx02lpbs3KUHyeZdbyZssqR14LPOLPFBCiMmJt6bsJBmtuaYIqeLLiJqahfGkWAPLqzXbBllTakYce4l-Eby0Rf5syDxDIuaFQIPvKeXrx3snCfJCgAP9vBpmzBShNKmGwezchi0uUIeOVrh1cuZxxWksaO8YablsYwasMovAUqOkKJ4OJyOVA9J7I2lthPFVjNAfQg-UcsGOwFpLs_eOhKO2KK2jo2_Ma4CMByETOUZjs4cmQ7gcMbF8BTFFdDMwJ5hCaw0vwaXdY52ZWGSppOWsiRNZUcA1VSQXbJ5tMuhPYBz0MSsqedNDSaX5U8E7EyWDHIpeArsHYcOce5EasvRwcEv8Ewb_YE7TKqCYrFRxRnT3h7ZRUcWMk6b2OVshCBUVE0APFi4qU7JZqjCJk_Hho1PXO0DOoZ4spb8yyEmNmE1Rm3UCEwFuAILChH2MA3Oxs0MYXHEOKRfsy9s-Rdu9qbTeVLxccICLKGOgYTBat_jDgTl0K3QWJrfNu7r4GCDjoPeCoN_aFa_lxXjGR2ftsP8dqst_C4_YoKg0M5HeCN_1QKvtsDJmQNGcMr6LW5OppfTwwW6GFUhElzMJeWbpOrNnpqKfoThUQF4wRZT6kZaxwBiysXIqdFw0FYCoIsWPCF_YPBIGakxgVfF7G4_4qi9OqW0BCmvropGaGc8fldvzMpNSC2C7J_LtangAxfepPOvxKAsRNOEAufIGwgBBxQjXmARQaendbHKVk-WgRbdYm_6qtCprgJIAZ8mpxpcbyS_5BiV4ahGOtxIlwMprkRz6VhqEpitJLCigQOnJGQr-aleIRKmeZ8R-zEPKAJZqfOICnNkcREg1iXdGltBCtxQsIf7dt_5Xui13ZL1lJTWKoPK6Y9WARLc6uRDNRK25KPutuOG1pHsiWJepuudxNhyiuKacqyErZpOZdNBYEFdlNTyckB9sKGRtCFP7cK0wGidTGerlBlRlB_0Qw2PeC8h5kHwjqcjbuJemFPZGJefLc7BIuYp8qXvlPGosEcbmJ30TgQKpxwoFFnwJxFEWCsqFE3YkAX2adg6IFXe8TBTZQAtgoBCBIufkXLPxcYTMNTWXDBaXd0mFlnnex5GTKtkVNkwrRhemI1M8OBxhMmOTAOhrJHZxRBc2G8pIcZANWzzpMzVNQbpYlMlJC-ZBU_IoWv9fQCS6CVnmSuKBElYuoRf-yJaXEhhNONVdklFcUmRkxESqsqj3rB49oD6DJS-pizOzMh2_Z_U_dAmRuuNhGxiGDIuziEPxKUJlguVGZe5ZMofJeWsuOIepmGJKSH_MPMvYZregSB7xlM4igjorQRk_V38GHGlOSHgXYYWtC64TaRTIdVsWxI6SOS6Esqr_IaPDdjLvRbbTBrIZSG85YF-xYB1nJRBhogcnxwvmexRHYSv1QP6lp-9MRJVoanAHiUW1axNnmY53y76Bk_xzU4JuaAZnxPeMJHa1Nv_eewPqhw-jl-m4NVk5u2WQKDv0U5obIsCfcLm8M98dZxetTB7xIYWRMClvef6-NH4-fArMtlwlWpCaS1C1wwRFJ9SjhWrdcNfHZpPLJYgEl96hdK60e_aQpq2sKdmRFkXaVvOviwhLNWOFKzuBcLqRGiYtlpA_VmyLGL3lwwJ3A9rK-89CGtLEqffbXKE-efyQzxtZVAt2MTcfU",
  "priv": "_bpSQu9ZkBVMPmRtuUk8A6GcN1JE_3WEu9PWaoXrZHD6INSRNwmQggywRSzCOeb-5byMvMpe02Qx6BB18t_SkA"
}
Figure 28: HPKE-12-KE Private JWK 
{
  "protected": "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",
  "aad": "VGhlIEZlbGxvd3NoaXAgb2YgdGhlIFJpbmc",
  "iv": "aH4N9YI2r_Sv_AQ9",
  "ciphertext": "9pmfuKSUFe_BKjeji5iSDH4i9VF_2WN4RECusjRj552CvDQRSFEniLzMKYgfOMHse_JOzD1NyaOU442FYPZM-TDVCWTbnLlb83U_QhytWiSbqryitb2wrEYQNw9hgPljkrynjKYXRC3KH4pUncGLLHB97KEoVbuy6CWwztMbroQ3ZKttPE5c4HPDPj0e-KuFxL_Rb5CS3pVMYpF0SlPeeWS03ujQbHUlbKmO3dRAq7XwpfCegeMZ2MOUEoOYTLjLQgBrDeJdUDyyy1kSlbfL6uDlXv3FJ7Xqz0VIw3w7XXqa2jl3kvt9Q0S8eoLJkOGO29FEFxsaXwWKIT6KV1DLLY-_eMwHoMZp7Y-quZoNTL__",
  "tag": "4FoSsoyyE21WcSkVW71lkw",
  "encrypted_key": "Sskl516u6GmQIsgnZ1vt7y9vWlUfPOdvjEKLdi17BTdLQuT-gLTtDVjO7NCYODoe"
}
Figure 29: HPKE-12-KE Flattened JWE JSON Serialization 
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.IXA2kEv8izZ7bSvVW7XWKVZtrpb83CaZ0eo4U6xaabvfchFROJThi2GjzvN1lgEo.MJ0s2quZHlJlDAx3.eKNbS1s4FrduLZspIYhm7a4ToICmCroCvrafnv4Yt0lhBuF9Ju-CN4y2c0Wl3rVHrckSK652EmVcfnFnUy3frL_3AItEVcwoeQKS5QsxzAxdNxSsjw0HasexdrnK1calIbGSgigb5a7OTFor9eUT-3qpXUF4KCKGFirGBG6Gqb0YNZ2qO6ra6w9rEzhE2wHAeKVZgp0LljkhVKYGku3M98I4Irf6wvlF2Olc2Cibldyh5gi07db-x6C6L2T1ItcLsbf_OQFIkbpzGBF1GbhPwkWC-zJw2Mcwlco_a8byjaMmHCkE2wdnIAm4VSeHljoLoLeN2xGpMQSainFkxMuzr8Il9borqwjFSyKKr4uWErgp.d9pCFfEnx0zwEioQR7OAoA
Figure 30: HPKE-12-KE JWE Compact Serialization

Acknowledgments

TODO acknowledge.

Document History

draft-skokan-jose-hpke-pq-pqt-04

draft-skokan-jose-hpke-pq-pqt-03

draft-skokan-jose-hpke-pq-pqt-02

draft-skokan-jose-hpke-pq-pqt-01

draft-skokan-jose-hpke-pq-pqt-00

Authors' Addresses

Filip Skokan
Okta
Brian Campbell
Ping Identity