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Re: [quicwg/base-drafts] don't allow 0 as a packet number (#832)

ekr <notifications@github.com> Thu, 19 October 2017 16:12 UTC

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Date: Thu, 19 Oct 2017 16:12:18 +0000
From: ekr <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] don't allow 0 as a packet number (#832)
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"To be more specific - AES-GCM should only use the same key for at most 2^32-2 nonces, i.e. packet numbers and in praxis less than that due to some possible attacks on GCM tags (the hash is computed on plain text for maximum parallellization, but that apparently has a cost in security)."

The limit we converged on for TLS is: 2^{24.5}
https://tlswg.github.io/tls13-spec/draft-ietf-tls-tls13.html#limits-on-key-usage

You can find the reference that led us to that here:
http://www.isg.rhul.ac.uk/~kp/TLS-AEbounds.pdf




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