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Old 2011-10-08, 23:32   #3

23·89 Posts

Originally Posted by debrouxl View Post
I'd say that he used about 50 full-time cores, because factoring a 512-bit RSA key takes at worst 100 CPU-days on recent quad-core desktop computers.
100 CPU-days on a quadcore is 400 core-days, or 9600 core hours.
I had estimated, and seen, around 460 +/- instance-hours on a 8-core in Amazon (High-CPU Extra Large) - that's 3680 core-hours.
Not sure where the discrepancy is there.

The original cash-for-primes people were these people whose site is gone, but references still exist.

If you had problems downloading the notes pdf from github, it's a github issue.
You can get it here:
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