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Re: [Cfrg] Security proofs v DH backdoors

Peter Gutmann <pgut001@cs.auckland.ac.nz> Mon, 31 October 2016 09:45 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Tony Arcieri <bascule@gmail.com>
Thread-Topic: [Cfrg] Security proofs v DH backdoors
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Date: Mon, 31 Oct 2016 09:44:50 +0000
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References: <20161025131014.5709905.2866.6563@blackberry.com> <20161025133016.GA9081@LK-Perkele-V2.elisa-laajakaista.fi> <1477456366629.49872@cs.auckland.ac.nz> <44595.1477524032@eng-mail01.juniper.net> <20161027103214.5709905.11728.6650@blackberry.com> <20161027125120.4d260334@pc1> <1477647359860.49982@cs.auckland.ac.nz>, <CAHOTMVJprJ0HAXLcvdzeSW8N99L-_43Gh7vEqL4Z=T541TVnSQ@mail.gmail.com>
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Cc: CFRG <cfrg@irtf.org>
Subject: Re: [Cfrg] Security proofs v DH backdoors
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Tony Arcieri <bascule@gmail.com> writes:

>FFDH has a massive legacy of insecure deployments. I do not think you can say
>the same of ECDH.

I don't know if you could call the small number of examples shown in various
papers "massive", it's certainly a real issue, but hardly a major one
affecting millions of systems.  In any case though the problem isn't DH or
ECDH, there's no long-term private key to leak, it's how they're
authenticated, with ECDSA, with RSA, or with PSK.

Peter.

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