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MT's proposed change. Fixes #1310. Fixes #1319
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ekr committed Jul 7, 2023
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9 changes: 4 additions & 5 deletions draft-ietf-tls-rfc8446bis.md
Original file line number Diff line number Diff line change
Expand Up @@ -1563,16 +1563,15 @@ Random value to the bytes:

44 4F 57 4E 47 52 44 01

If negotiating TLS 1.1 or below, TLS 1.3 servers MUST, and TLS 1.2
servers SHOULD, set the last 8 bytes of their ServerHello.Random value to the
{{RFC8996}} and {{backward-compatibility-security}} forbid
the negotation of TLS versions below 1.2. However, server
implementations which do not follow that guidance MUST
set the last 8 bytes of their ServerHello.random value to the
bytes:

44 4F 57 4E 47 52 44 00


Note that {{RFC8996}} and {{backward-compatibility-security}} forbid
the negotation of TLS versions below 1.2; implementations which do not
follow that guidance MUST behave as described above.

TLS 1.3 clients receiving a ServerHello indicating TLS 1.2 or below
MUST check that the last 8 bytes are not equal to either of these values.
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