----- Original Message -----
From: "NOP" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 13, 2003 4:48 PM
Subject: Diffie-Hellman 128 bit


> I am looking at attacks on Diffie-Hellman.
>
> The protocol implementation I'm looking at designed their diffie-hellman
> using 128 bit primes (generated each time, yet P-1/2 will be a prime, so
no
> go on pohlig-hellman attack),

128-bit prime DH would be trivially breakable, maybe you mean that
it uses128-bit secret keys (and a larger prime, such as 512-bit prime at
least)?

In any case, you can probably get all the information you are looking
for in this manuscript:
http://crypto.cs.mcgill.ca/~stiglic/Papers/dhfull.pdf

Cheers!

--Anton



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