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Re: [TLS] RFC 7919 on Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS)

Watson Ladd <watsonbladd@gmail.com> Fri, 19 August 2016 13:53 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Fri, 19 Aug 2016 06:52:00 -0700
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To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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Subject: Re: [TLS] RFC 7919 on Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS)
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On Fri, Aug 19, 2016 at 6:03 AM, Peter Gutmann
<pgut001@cs.auckland.ac.nz> wrote:
> Ilari Liusvaara <ilariliusvaara@welho.com> writes:
>
>>AFAIK, that failure can only happen if at least one of:
>
> [...]
>
> New groups are introduced but the server or client only support the old ones.
> So the server does ffdhe2048, the client does ffdhe2048', both are quite happy
> to do DHE-2048 but as a result of complying with 7919 they're forced to use
> RSA.

Let's assume we don't introduce more groups for no reason. Oh wait, we
totally did with ECC with this outcome. Let's not do that again.

>
> Peter.
> _______________________________________________
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> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls



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