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Re: [TLS] PSS for TLS 1.3

Peter Bowen <pzbowen@gmail.com> Mon, 23 March 2015 03:38 UTC

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Date: Sun, 22 Mar 2015 20:38:29 -0700
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From: Peter Bowen <pzbowen@gmail.com>
To: Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [TLS] PSS for TLS 1.3
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On Sun, Mar 22, 2015 at 3:09 PM, Eric Rescorla <ekr@rtfm.com> wrote:
> During the interim we discussed discussion about adopting PSS for
> RSA signatures in TLS 1.3.
>
> Clearly, we will not be able to just adopt PSS because certificates
> will continue to be signed with PKCS#1 1.5.

I would like to see TLS 1.3 allow certificates signed using PSS (RFC
4055 and 3447) and provide a way to signal the server that such
certificates are supported.  Currently there is no way to use PSS
signed certificates with TLS at all, which is a problem.  I agree with
the move to EC* as the preferred algorithm, but it seems like
enhancing non-EC signatures makes sense for the same reason as fixing
FFDHE.

Possibly the SignatureAlgorithm extension could carry both (1) rsa and
(tbd) rsa-pss?

Thanks,
Peter

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