If you are using an Intel CPU then you may have the RDRAND instruction that provides a hardware based random number.

If you can use the Intel MKL then there is a range of pseudo-random number generators available: MKL random-number-generators

 

Radioactive decay and detector noise are very good HRNG (Hardware Random Number Generator) but my absolute favorite HRNG is this one.

That does look like a nice device, the price seems a little steep at €1,355.00 but maybe worth it. Thanks.

 

Schrödinger's cat agrees with you.

 

If I can figure out how to attach code to the thread, I could send you the test code. I am doing something wrong.

This link will show you how to include code in your posts.