Re: [TLS] Call for WG adoption draft-josefsson-tls-curve25519

Rob Stradling <rob.stradling@comodo.com> Fri, 29 May 2015 21:33 UTC

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Date: Fri, 29 May 2015 22:32:56 +0100
From: Rob Stradling <rob.stradling@comodo.com>
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To: Simon Josefsson <simon@josefsson.org>, Yoav Nir <ynir.ietf@gmail.com>
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Subject: Re: [TLS] Call for WG adoption draft-josefsson-tls-curve25519
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On 29/05/15 22:01, Simon Josefsson wrote:
> Yoav Nir <ynir.ietf@gmail.com>; writes:
>
>> Me too.
>>
>> I notice that while the draft doesn’t say that explicitly, it uses
>> existing *_ECDHE_* ciphersuites, so that no new ciphersuites are
>> required, despite the fact that this ECDHE has different point formats
>> and different back-end math than the existing ECDHE.  I wonder if we
>> can also get away with using *ECDSA* ciphersuites for EdDSA
>> signatures.
>
> This is an interesting idea, thanks for mentioning that.  It would ugly
> for "ECDSA" in a cipher suite name to not actually mean that ECDSA is
> used, but it is a valid engineering tradeoff to sometimes prefer ugly
> things that simplify over beautiful things that complicate.

The TLS 1.3 draft renames the Supported Elliptic Curves extension so 
that it can contain non-EC groups.  So renaming things in the IANA TLS 
registries doesn't seem to be prohibited, AFAICT.

Could we rename the TLS_ECDHE_ECDSA_* cipher suites so that they're not 
specific to ECDSA?  (TLS_ECDHE_EC_* perhaps?)

--
Rob Stradling
Senior Research & Development Scientist
COMODO - Creating Trust Online
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