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Re: [TLS] Inclusion of OCB mode in TLS 1.3

Watson Ladd <watsonbladd@gmail.com> Wed, 21 January 2015 16:25 UTC

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Date: Wed, 21 Jan 2015 08:25:36 -0800
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From: Watson Ladd <watsonbladd@gmail.com>
To: "Salz, Rich" <rsalz@akamai.com>
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Cc: TLS Mailing List <tls@ietf.org>
Subject: Re: [TLS] Inclusion of OCB mode in TLS 1.3
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On Wed, Jan 21, 2015 at 8:21 AM, Salz, Rich <rsalz@akamai.com> wrote:
>> Right now this ID would add twelve (12) new ciphersuites to
>> the TLS ciphersuite registry, if we /can/ get rid of these two we're down to
>> ten (10).
>
> Gaak.
>
> What does OCB bring to the table that justifies such a huge increase (10%) in the number of ciphers.

Side-channel resistance and performance on hardware with AES but no
carryless multiplier.

>
> We need a cipher cage match.  They call go in, and only a couple come out.

If you don't need to support them all, what's the cost (assuming they
are all secure)?
>
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