Re: [TLS] Another INRIA bug in TLS

Martin Thomson <martin.thomson@gmail.com> Fri, 22 May 2015 23:45 UTC

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Date: Fri, 22 May 2015 16:45:11 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: Andrey Jivsov <crypto@brainhub.org>
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Subject: Re: [TLS] Another INRIA bug in TLS
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On 22 May 2015 at 16:27, Andrey Jivsov <crypto@brainhub.org>; wrote:
> To rephrase, what's the slice of the Internet that cannot do DHE P-256 but
> can do DHE 2048?

I can only answer for the slice that I see, which is mostly server
behavior.  Are you asking about clients?

>From the client end, we see 4-5% of connections on DHE[1].  Most of
those servers choose 1024-bit groups [2].

[1] Values in the 20s:
http://telemetry.mozilla.org/#filter=release%2F37%2FSSL_CIPHER_SUITE_FULL%2Fsaved_session%2FFirefox&aggregates=multiselect-all!Submissions&evoOver=Builds&locked=true&sanitize=true&renderhistogram=Graph
[2] Guess what means what here:
http://telemetry.mozilla.org/#filter=release%2F37%2FSSL_KEA_DHE_KEY_SIZE_FULL%2Fsaved_session%2FFirefox&aggregates=multiselect-all!Submissions&evoOver=Builds&locked=true&sanitize=true&renderhistogram=Graph