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Building a Better Random

David Fowler wants to generate a random number:

You see the problem? Well in the post that I mentioned, I adressed this issue and offered a solution using CHECKSUM() and NEWID().

That’s ok but can be a bit cumbersome. I recently stumbled across a function that I hadn’t realised was there before (and of course this is where you all tell me, we’ve known about that all the time), CRYPT_GEN_RANDOM().

My expectation with this was that CRYPT_GEN_RANDOM() would generate according to a uniform distribution. Performing a simple experiment with about 4 million entries against random numbers 0-255 (1 byte), I can confirm that this does approximate a uniform distribution.

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