> bang--for-your-buck Testing for randomness is impossible in the YES/NO sense, so the best we have is statistical test batteries like NIST's 800-22, DieHarder

> bang--for-your-buck Testing for randomness is impossible in the YES/NO sense, so the best we have is statistical test batteries like NIST's 800-22, DieHarder and TestU01. I own a Truerng and a Onerng, both are under $50. They performed better on Dieharder than my computer's Intel RNG. Not by a huge margin, but still. All 3 passed the minimum requirements of course.