I didn't write anything about environment-based RNG. RNG must be deterministic and seeded by preshared encryption key. One point of using a cryptographically se

I didn't write anything about environment-based RNG. RNG must be deterministic and seeded by preshared encryption key. One point of using a cryptographically secure RNG is that it should not be possible to learn the seed by observing the output of the RNG without bruteforcing the key.