Re: [FD] Should openssl accept weak DSA/DH keys with g = +/- 1 ?

[Jeffrey Walton <noloader@xxxxxxxxx>]

On Thu, Apr 17, 2014 at 12:50 PM, Pavel Kankovsky
<peak@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Does anyone use non-safe primes for DH? Afaik any well-known moduli are
> safe. And openssl dhparam generates safe primes only.
g = 2 is not a generator though its often used. Its possible to leak
information depending on parameter selection (or only generate half
the values of the group). See, for example, "Diffie-Hellman Parameter
Check (when g = 2, must p mod 24 == 11?)",
http://crypto.stackexchange.com/questions/12961/diffie-hellman-parameter-check-when-g-2-must-p-mod-24-11.

Jeff

_______________________________________________
Sent through the Full Disclosure mailing list
http://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/