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[CFRG] Comment on draft-irtf-cfrg-aead-limits-01

John Mattsson <john.mattsson@ericsson.com> Mon, 16 November 2020 14:32 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: CFRG <cfrg@irtf.org>
Thread-Topic: Comment on draft-irtf-cfrg-aead-limits-01
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Date: Mon, 16 Nov 2020 14:32:44 +0000
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Subject: [CFRG] Comment on draft-irtf-cfrg-aead-limits-01
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Hi,

The draft defines l as  "Length of each message (in blocks)" While https://www.isg.rhul.ac.uk/~kp/TLS-AEbounds.pdf defines l as "input length in blocks"

I assume the definition in the draft should be "input length in blocks" and that the rewriting comes from TLS where A = "". It would also be good to clearly define what "input" (or "message") is, none of the terms are well-defined. Suggestion:

OLD    "Length of each message (in blocks)"
NEW   ""input length (plaintext + additional authenticated data) in blocks"

(I assume https://www.isg.rhul.ac.uk/~kp/TLS-AEbounds.pdf means that "input" is P and A, i.e. not K and N).

Cheers,
John

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