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[TLS] Choice of Additional Data Computation

Hannes Tschofenig <Hannes.Tschofenig@arm.com> Fri, 24 April 2020 11:04 UTC

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: "tls@ietf.org" <tls@ietf.org>
Thread-Topic: Choice of Additional Data Computation
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Date: Fri, 24 Apr 2020 11:04:06 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/aNBqNIW0i_v0yhbKUIcCGcdfM9M>
Subject: [TLS] Choice of Additional Data Computation
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Hi all,

the thread on the AEAD commutation in DTLS 1.3 and the construction of the additional data raised two interesting questions. I believe those would benefit from a formal analysis or at least a security investigation.

Here are the questions:


  1.  Generic question: Should the construction of the additional data be dependent on what is transmitted over the wire or should it be based on a "pseudo header"? DTLS 1.2 uses a pseudo header and DTLS 1.3 the data transmitted over the wire in the additional data calculation.
  2.  Specific question: Should the CID be included in the additional data calculation, particularly for the case where it is only implicitly sent? Asked differently, are there attacks possible?

Your feedback would be appreciated to advance the discussion. I believe there is a chance to provide generic guidance for security protocol designers here.

Ciao
Hannes

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