Not all random number generators are created equal. The Python documentation warns that Python's built-in random number generator isn't suitable for cryptographic purposes, where a minimum level ...

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.… ...

OTTAWA — An Ottawa physicist has developed a way to generate random numbers, the key to encrypting data in ways that hackers can’t figure out.