[Cryptography Team] PrimesFinder using #atRandom

[Chris Muller]

Has anyone tried

  ElGamalKeyGenerator new generateKeysOfSize: 2048

?

The ElGamal tests pass because they use but a 15-bit
key!  Does anyone mind if I beef up this test and
possibly others?

I can post notice of my commit here when I'm done and
then someone else can review it if they want?  The
tests will not pass unless we fix the issue itself.

The issue itself appears to be caused by use of the
Float-based "Random" generator.  I haven't yet tried
replacing it with SecureRandom, but I will try that
soon.