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RE: DH group exchange (Re: SSH key algorithm updates)

Peter Gutmann <pgut001@cs.auckland.ac.nz> Sat, 12 December 2015 04:50 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: "Mark D. Baushke" <mdb@juniper.net>, Niels Möller <nisse@lysator.liu.se>
CC: Damien Miller <djm@mindrot.org>, denis bider <ietf-ssh3@denisbider.com>, Jeffrey Hutzelman <jhutz@cmu.edu>, "ietf-ssh@NetBSD.org" <ietf-ssh@NetBSD.org>, "stephen.farrell@cs.tcd.ie" <stephen.farrell@cs.tcd.ie>, "jon@siliconcircus.com" <jon@siliconcircus.com>
Subject: RE: DH group exchange (Re: SSH key algorithm updates)
Thread-Topic: DH group exchange (Re: SSH key algorithm updates)
Thread-Index: AQHRM1G1N/YsUT4SL0yYPYnr9roRzp7GyoYx
Date: Sat, 12 Dec 2015 04:50:32 +0000
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mdb@juniper.net <mdb@juniper.net> writes:

>Well, what do other folks on the list think? Is it time to add SHA3 to the
>SSH standard for DH Group15 and DH Group16?

Nope.  We know, from the outcome of the SHA-3 competition, that SHA-2 is
actually a lot stronger than people thought.  So adding SHA-3 would be adding
yet another extra algorithm that's not noticeably stronger than SHA-2 (just
different), but a whole lot slower.  If there's some desperate demand for a
new hash algorithm, I'd rather have Blake2, which is at least an improvement
on SHA-2.

Peter.

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