Internet-Draft draft-ietf-tls-extended-key-update-13.txt is now available. It
is a work item of the Transport Layer Security (TLS) WG of the IETF.
Title: Extended Key Update for Transport Layer Security (TLS) 1.3
Authors: Hannes Tschofenig
Michael Tüxen
Tirumaleswar Reddy
Steffen Fries
Yaroslav Rosomakho
Name: draft-ietf-tls-extended-key-update-13.txt
Pages: 43
Dates: 2026-07-04
Abstract:
TLS 1.3 ensures forward secrecy by performing an ephemeral Diffie-
Hellman key exchange during the initial handshake, protecting past
communications even if a party's long-term keys (typically a private
key with a corresponding certificate) are later compromised.
While the built-in KeyUpdate mechanism allows application traffic
keys to be refreshed during a session, it does not incorporate fresh
entropy from a new key exchange and therefore does not provide post-
compromise security. This limitation can pose a security risk in
long-lived sessions, such as those found in industrial IoT or
telecommunications environments.
To address this, this specification defines an extended key update
mechanism that performs a fresh execution of the key exchange
negotiated during the initial handshake within an active session,
thereby ensuring post-compromise security.
By forcing attackers to exfiltrate new key material repeatedly, this
approach mitigates the risks associated with static key compromise.
Regular renewal of session keys helps contain the impact of such
compromises. The extension is applicable to both TLS 1.3 and DTLS
1.3.
The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-tls-extended-key-update/
There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-tls-extended-key-update-13.html
A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-ietf-tls-extended-key-update-13
Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts
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