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Re: [quicwg/base-drafts] Handling of duplicate packets (#1405)

MikkelFJ <notifications@github.com> Mon, 18 June 2018 12:03 UTC

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Subject: Re: [quicwg/base-drafts] Handling of duplicate packets (#1405)
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But I think you are right that QUIC should much more prominently document such a rekeying requirement. For example that a key update MUST happen no later than after 2^32 packet exhanges or earlier if specific AEAD mode requires this (but such modes probably shouldn't be permitted).

While some crypto modes could surve much more than 2^32 other modes would eventually fail badly (AES-GCM). By forcing an update no later than 2^32 it is easy to avoid implementation mistakes and for the peer to do a hard disconnect if keys are not updated. Silent crypto errors are really bad.

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