Even though rand() may be a good enough random number generator for making a video game, the patterns of random bits it spits out may not be sufficient for applications requiring truly random data.… ...

For example, it would be better to use a random-number generator that produces a sequence of zeros, ones, and twos and then ignores the zeros to give a sequence of just ones and twos.

In the Swiss experiment, the camera was used to create a 1.25 Gbit/s stream of random numbers. One worry about any random-number generator is that the numbers could be influenced in a predictable way ...

The generation of random bit sequences at a data rate of up to 300 Gbit s−1 — a rate many orders of magnitude faster than previously achieved — is realized by exploiting the output ...