Title: LS on supporting transmission of large identity in EAP-AKA’ Submission Date: 2026-05-29 URL of the IETF Web page: https://datatracker.ietf.org/liaison/2162/
To: EAP Method Update (emu) From: 3GPP TSG SA WG3 Purpose: For action Please reply by 2026-08-07 Email Addresses --------------- From: Tao Wan <[email protected]> To: Joseph Salowey <[email protected]>,Peter Yee <[email protected]> Cc: Deb Cooley <[email protected]>,Peter Yee <[email protected]>,Joseph Salowey <[email protected]>,EAP Method Update Discussion List <[email protected]>,Christopher Inacio <[email protected]>,Charles Eckel <[email protected]> Response Contacts: 3GPP Liaisons Coordinator <[email protected]> Peter Schmitt <[email protected]> Technical Contacts: Body: 1. Overall description 3GPP SA3 has been conducting a study on transitioning to PQC [1], including the calculation of Subscription Concealed Identifiers (SUCI) using post-quantum cryptographic (PQC) algorithms. In future, SUCI could be larger than the EAP MTU of 1020 bytes and Ethernet MTU of 1500 bytes. SUCI can be sent by a UE to an EAP server in either EAP Response/Identity or EAP Response/AKA-Identity. However, neither EAP [2] nor EAP-AKA’ [3, 4] provides fragmentation mechanism to support the transmission of an identity larger than EAP MTU. 3GPP SA3 kindly requests IETF EMU to consider updating EAP-AKA’ to support the transmission of an identity larger than EAP MTU. References [1] 3GPP TR 33.703. Study on Transitioning to Post Quantum Cryptography (PQC) in 3GPP (Release 20). [2] IETF RFC 4380. Extensible Authentication Protocol (EAP). [3] IETF RFC 5448. Improved Extensible Authentication Protocol Method for 3rd Generation Authentication and Key Agreement (EAP-AKA'). [4] IETF RFC 9048. Improved Extensible Authentication Protocol Method for 3GPP Mobile Network Authentication and Key Agreement (EAP-AKA'). 2. Actions To IETF EMU ACTION: Please kindly consider the above request and keep 3GPP SA3 informed of the progress. 3. Dates of next TSG SA WG 3 meetings SA3#129 24 – 28 August 2026 Prague, Czech SA3#130 12 – 16 October 2026 Prague, Czech Attachments: LS on supporting transmission of large identity in EAP-AKA’ https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2026-05-29-3gpp-tsg-sa-wg3-emu-ls-on-supporting-transmission-of-large-identity-in-eap-aka-attachment-1.pdf _______________________________________________ Emu mailing list -- [email protected] To unsubscribe send an email to [email protected]
