How to deal with a slow SecureRandom generator?

Question

If you want a cryptographically strong random numbers in Java, you use SecureRandom. Unfortunately, SecureRandom can be very slow. If it uses

Answer 1

If your hardware supports it try using Java RdRand Utility of which I'm the author.

Its based on Intel's RDRAND instruction and is about 10 times faster than SecureRandom and no bandwidth issues for large volume implementation.

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Note that this implementation only works on those CPU's that provide the instruction (i.e. when the rdrand processor flag is set). You need to explicitly instantiate it through the RdRandRandom() constructor; no specific Provider has been implemented.