On Tuesday, Mar 11, 2003, at 11:28 US/Eastern, tom st denis wrote:



--- Tero Kivinen <[EMAIL PROTECTED]> wrote:
SOPHIE GERMAIN PRIME SEARCH
FIXED 64 bits.
INDEX 0:
PRIME (bits 512), index = 131, 0.989151 seconds:

0xffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bb ea63b139b22514a08798e3404ddef9519b3cd3a439dffffffffffffffff

What is the benefit of having leading/trailing bits fixed?  As far as I
know it doesn't make any form of index calculus attack any harder to
apply.

Performance.


See RFC 2412, Appendix E.

http://www.ietf.org/rfc/rfc2412.txt

-J


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