Re: [quicwg/base-drafts] Better articulate principles for ciphersuites (#2743)

Rui Paulo <> Wed, 22 May 2019 10:15 UTC

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Subject: Re: [quicwg/base-drafts] Better articulate principles for ciphersuites (#2743)
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rpaulo commented on this pull request.

> @@ -825,11 +825,17 @@ This provides protection against off-path attackers and robustness against QUIC
 version unaware middleboxes, but not against on-path attackers.
 QUIC can use any of the ciphersuites defined in {{!TLS13}} with the exception of
-TLS_AES_128_CCM_8_SHA256.  The AEAD for that ciphersuite, AEAD_AES_128_CCM_8
-{{?CCM=RFC6655}}, does not produce a large enough authentication tag for use
-with the header protection designs provided (see {{header-protect}}).  All other
-ciphersuites defined in {{!TLS13}} have a 16-byte authentication tag and produce
-an output 16 bytes larger than their input.
+TLS_AES_128_CCM_8_SHA256.  A ciphersuite MUST NOT be negotiated unless a header
+protection scheme is defined for the ciphersuite.  This document defines a
+header protection scheme for all ciphersuites defined in {{!TLS13}} aside from
+TLS_AES_128_CCM_8_SHA256.  These ciphersuites have a 16-byte authentication tag
+and produce an output 16 bytes larger than their input.
+: An endpoint MUST NOT reject a ClientHello that offers a ciphersuite that

duplicate "that offers a cipher suite"

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