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

Georgi Guninski guninski at guninski.com
Fri Sep 4 01:26:05 PDT 2015


On Thu, Sep 03, 2015 at 11:59:11AM +0000, Peter Gutmann wrote:
> the number of affected implementations would be approximately zero.
>

openssl's DSA appears to check primality of q.

Attached are pub and private key with q composite
(beware the private key might not be generated correctly).

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-----BEGIN PUBLIC KEY-----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==
-----END PUBLIC KEY-----


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