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CurrentBEST CURRENT PRACTICEIETF streamBCP195

RFC 9852: New Protocols Using TLS Must Require TLS 1.3

In plain English — editorial summary, not part of the RFC

TLS 1.3 is widely used, has had comprehensive security proofs, and improves both security and privacy deficiencies in TLS 1.2. Therefore, new protocols that use TLS must require TLS 1.3. As DTLS 1.3 is not widely available or deployed, this prescription does not pertain to DTLS (in any DTLS version); it pertains to TLS only. This document updates RFC 9325. It discusses post-quantum cryptography and the security and privacy improvements in TLS 1.3 as the rationale for the update.

Document record

Document ID
RFC9852
Published
July 2026
Authors
R. Salz; N. Aviram
Status
BEST CURRENT PRACTICE
Stream
IETF
Area
sec
Pages
7
Also known as
BCP195
Updates:
RFC 9325

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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