GPUs as high-performance random sources

A non-algorithmic physical random bit generator is introduced, using a graphic processing unit (GPU) as a random source. The generator takes randomness from parallel threads executing atomic instructions. The generator in terms of pass rates from the National Institute of Standards and Technology (NIST)´s statistical test suite and bit generation throughput is evaluated. The generator compares favourably with pseudorandom bit generators known to have fine statistical properties. The test bed Nvidia´s GPU GTX 680 can generate random bits at the rate of hundreds of megabits per second. The cost-effectiveness of GPUs as random key generators can be increased, as GPUs are now readily available in most desktop computers, and even in smart phones.