Proven Primes

[tom st denis]

--- Tero Kivinen <kivinen at iki.fi> wrote:
> SOPHIE GERMAIN PRIME SEARCH
> FIXED 64 bits.
> INDEX 0: 
> PRIME (bits 512), index = 131, 0.989151 seconds: 
>
0xffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a439dffffffffffffffff

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.

Tom

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