Re: [TLS] AES-OCB in TLS [New Version Notification for draft-zauner-tls-aes-ocb-03.txt]

Eric Rescorla <ekr@rtfm.com> Mon, 01 June 2015 12:47 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Mon, 1 Jun 2015 05:47:08 -0700
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To: Aaron Zauner <azet@azet.org>
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Cc: Phillip Rogaway <rogaway@cs.ucdavis.edu>, TLS Mailing List <tls@ietf.org>, Charanjit Jutla <csjutla@us.ibm.com>
Subject: Re: [TLS] AES-OCB in TLS [New Version Notification for draft-zauner-tls-aes-ocb-03.txt]
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On Mon, Jun 1, 2015 at 5:37 AM, Aaron Zauner <azet@azet.org> wrote:

> Hi Ekr,
>
> Eric Rescorla wrote:
> > On Mon, Jun 1, 2015 at 5:06 AM, Aaron Zauner <azet@azet.org
> > <mailto:azet@azet.org>> wrote:
> >
> >      * I'd also like to get rid of ECDSA ciphersuites alltogether,
> ideally
> >        leaving a few real-world, high-performance ciphersuites to use
> >
> >
> > I don't understand this point: ECDSA cipher suites are the ones with the
> > best performance at present.
> >
>
> Firstly, as far as I know it's also quite difficult to get ECDSA
> certificates in the wild. Has this changed significantly over the past
> couple of months?


They certainly do exist. For instance, I'm connected to Google with one now.
I believe Let's Encrypt also intends to issue for ECDSA.



> Second - there's a current draft on EdDSA, which I'd
> prefer over ECDSA, if somehow possible.


Well, the CFRG hasn't decided on next-gen signature schemes, so I expect
that any standardization of EdDSA is going to take a while. Also, it seems
at least possible that it will still use an ECDSA cipher suite name.

-Ekr


I'm more about minimizing the
> list of cipher-suites this draft introduces than to point out that I
> dislike a particular signature schemes.
>
> Aaron
>
>