RFC 9851: TLS 1.2 is in Feature Freeze
The TLS 1.2 protocol is in feature freeze, meaning no new features will be added to it. This has implications for post-quantum cryptography, as efforts to implement it will focus on TLS 1.3 or later. The industry is preparing for a transition to post-quantum cryptography, with various organizations releasing standards and roadmaps.
- ▪The US National Institute of Standards and Technology started a multi-year effort to standardize post-quantum cryptography algorithms in 2016.
- ▪NIST released standards for several post-quantum cryptography algorithms in 2024.
- ▪The IETF has formed a working group to work on the use of post-quantum cryptography in IETF protocols, including TLS.
- ▪The TLS Working Group is focused exclusively on TLS 1.3 or later for post-quantum cryptography efforts.
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| Original publisher | Rfc-editor |
| Canonical URL | https://www.rfc-editor.org/rfc/rfc9851.html |
| Publication time | Mon, 03 Aug 2026 01:23:26 +0000 |
| Retrieval time | 2026-08-03T01:45:44.804Z |
| Last seen | 2026-08-03T01:45:44.804Z |
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2. Implications for Post-Quantum Cryptography (PQC) Cryptographically relevant quantum computers, once available, are likely to greatly lessen the time and effort needed to break RSA, finite-field-based Diffie-Hellman (FFDH), or Elliptic Curve Cryptography (ECC) which are currently used in TLS. In 2016, the US National Institute of Standards and Technology (NIST) started a multi-year effort to standardize algorithms that will be "safe" once quantum computers are feasible [PQC]. Initial discussions in the IETF community happened around the same time [CFRGSLIDES].¶ In 2024, NIST released standards for [ML-KEM], [ML-DSA], and [SLH-DSA].
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