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Re: [TLS] [Technical Errata Reported] RFC5288 (4694)

Peter Gutmann <pgut001@cs.auckland.ac.nz> Sun, 15 May 2016 03:28 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: RFC Errata System <rfc-editor@rfc-editor.org>, "jsalowey@cisco.com" <jsalowey@cisco.com>, "abhijitc@cisco.com" <abhijitc@cisco.com>, "mcgrew@cisco.com" <mcgrew@cisco.com>, "stephen.farrell@cs.tcd.ie" <stephen.farrell@cs.tcd.ie>, "Kathleen.Moriarty.ietf@gmail.com" <Kathleen.Moriarty.ietf@gmail.com>, "sean+ietf@sn3rd.com" <sean+ietf@sn3rd.com>, "joe@salowey.net" <joe@salowey.net>
Thread-Topic: [TLS] [Technical Errata Reported] RFC5288 (4694)
Thread-Index: AQHRri1VhVjCQK4OfkSA69GbEmT/Zp+5VwH6
Date: Sun, 15 May 2016 03:27:55 +0000
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Subject: Re: [TLS] [Technical Errata Reported] RFC5288 (4694)
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RFC Errata System <rfc-editor@rfc-editor.org> writes:

>The following errata report has been submitted for RFC5288, "AES Galois
>Counter Mode (GCM) Cipher Suites for TLS".

I think the erratum needs an erratum.  Firstly, "nonce" doesn't mean "number
used once", and secondly nonce re-use in AES-GCM doesn't just result in
"catastrophic failure of it's authenticity", it results in catastrophic
failure of the entire mode, both confidentiality and integrity/authenticity.

Peter.

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