Re: [TLS] Confirming Consensus on supporting only AEAD ciphers

Peter Bowen <pzbowen@gmail.com> Tue, 29 April 2014 16:27 UTC

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Date: Tue, 29 Apr 2014 09:27:08 -0700
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From: Peter Bowen <pzbowen@gmail.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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Subject: Re: [TLS] Confirming Consensus on supporting only AEAD ciphers
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On Tue, Apr 29, 2014 at 8:55 AM, Peter Gutmann
<pgut001@cs.auckland.ac.nz> wrote:
> Fedor Brunner <fedor.brunner@azet.sk> writes:
>
>>The Mandatory Cipher Suite for TLS 1.2 was TLS_RSA_WITH_AES_128_CBC_SHA. What
>>is the mandatory cipher in TLS 1.3 ? Maybe
>>TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 using Curve25519 for ECDHE ?
>
> Ugh, no.  That takes the ciphers from <industry-standard>+<industry-standard>
> +<industry-standard> to <oddball-nonstandard>+<oddball-nonstandard>+<oddball-
> nonstandard>+<industry-standard>.  Make the defaults something that can be
> implemented with a standard crypto library, and leave the oddball stuff as
> optional fashion statements.

TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 with the secp256r1 curve is
probably the best option from the existing registries.  If there is a
desire to avoid EC (and therefore avoid bringing in more extensions,
then TLS_RSA_WITH_AES_128_GCM_SHA256 is the next best choice from the
existing registries.

Thanks,
Peter