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Re: [TLS] [Errata Verified] RFC5288 (4694)

Peter Gutmann <pgut001@cs.auckland.ac.nz> Fri, 25 November 2016 08:28 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: RFC Errata System <rfc-editor@rfc-editor.org>, "azet@azet.org" <azet@azet.org>, "jsalowey@cisco.com" <jsalowey@cisco.com>, "abhijitc@cisco.com" <abhijitc@cisco.com>, "mcgrew@cisco.com" <mcgrew@cisco.com>
Thread-Topic: [TLS] [Errata Verified] RFC5288 (4694)
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Date: Fri, 25 Nov 2016 08:28:41 +0000
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Subject: Re: [TLS] [Errata Verified] RFC5288 (4694)
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RFC Errata System <rfc-editor@rfc-editor.org> writes:

>The following errata report has been verified 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".  Secondly, nonce reuse doesn't just result in a failure of
integrity-protection, it also results in a loss of confidentiality protection.
In other words it leads to total breach of the encryption mode's security,
both properties that it's supposed to provide are no longer present.

Peter.

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