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Re: [TLS] Consensus Call on Removing GMT from the Handshake

"Dan Harkins" <dharkins@lounge.org> Mon, 16 June 2014 00:52 UTC

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Date: Sun, 15 Jun 2014 17:52:34 -0700
From: Dan Harkins <dharkins@lounge.org>
To: Jacob Appelbaum <jacob@appelbaum.net>
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Subject: Re: [TLS] Consensus Call on Removing GMT from the Handshake
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On Sat, June 14, 2014 6:31 am, Jacob Appelbaum wrote:
> On 6/13/14, Joseph Salowey (jsalowey) <jsalowey@cisco.com> wrote:
>> There appears to be significant support for the removal of GMT from the
>> client
>> and server random values in TLS. The chairs would like to ask two
>> questions:
>>
>> - Should we remove the GMT values from the client and server values in
>> TLS
>> 1.3?
>>
>
> I would request that the language in 1.3 be MUST for clients to avoid
> client fingerprinting by a passive or active adversary. For servers, I
> would request that they servers SHOULD make it random. I would also
> request that for 1.3 that it isn't a requirement (MUST) to make it
> random.

  I see no value in retaining the GMT value in the server random. Making
it optional requires some justification. Care to share it?

  Dan.

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