Possible crypto backdoor in RFC-2631 Diffie-Hellman Key Agreement Method

Georgi Guninski guninski at guninski.com
Sat Sep 5 07:31:47 PDT 2015

On Sat, Sep 05, 2015 at 02:06:22PM +0000, Alfonso De Gregorio wrote:
> On Sat, Sep 5, 2015 at 1:31 PM, Georgi Guninski <guninski at guninski.com> wrote:
> > On Sat, Sep 05, 2015 at 11:45:07AM +0000, Peter Gutmann wrote:
> >> The real question though is, why would anyone use parameters they didn't
> >> generate themselves?  All DSA implementations I've seen (apart from some
> >
> > What about MITM in DH -- where do you get the keys from
> > in this case?
> A key-recovery attack may allow the retroactive decryption of past
> communication sessions, if the network endpoints rely on fixed
> Diffie-Hellman. Of course, whenever an attacker can successfully mount
> a MITM attack the current sessions are compromised.

Thanks. Are you referring to "DH as per the fucked RFC" or as "DH implemented

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