https://en.wikipedia.org/wiki/Dual_EC_DRBG https://en.wikipedia.org/wiki/Dual_EC_DRBG That's the case I know of. Basically you mathematically design a curve t

https://en.wikipedia.org/wiki/Dual_EC_DRBG https://en.wikipedia.org/wiki/Dual_EC_DRBG That's the case I know of. Basically you mathematically design a curve that makes it look like it's random numbers but the numbers aren't actually random.