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Re: [quicwg/base-drafts] Use the same KDF regardless of TLS version (#2034)

Martin Thomson <notifications@github.com> Fri, 23 November 2018 00:04 UTC

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Subject: Re: [quicwg/base-drafts] Use the same KDF regardless of TLS version (#2034)
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I don't think that the collision argument is particularly relevant, because we ensure that QUIC is the exclusive user of the secret (something I think that we want to stipulate).  I always viewed the TLS negotiation as exporting just the secrets and cipher suite.  We extract AEAD and hash from the suite.  It doesn't export a keyed AEAD (it could), because that wouldn't work for header protection.  And just as QUIC provided its own AEAD, why not also a KDF?

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