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What they're doing is doing a fast test to see if a candidate prime prime+step has any of the smallest 669 primes as a factor (by testing whether prime%p + step is a multiple of the small prime p. If they do find that the candidate has a small factor, then it is obviously not prime (and so they don't need to spend the comparatively long time running the ...


I'm assuming that you mean any time the file changes, it is re-encrypted with PGP. Here is a description of how PGP encryption works: Whenever you change the file and re-encrypt with PGP, a new, independent session key is chosen. So what you end up with is a (potentially only slightly) modified file, being encrypted with a brand new session key. All ...

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