A Note on the Entropic Bounds for the Entropy Sources Used in Cryptographic Modules
As the security of modern cryptography heavily depends upon the existence of random bit generators, there has been comprehensive study on the pseudorandom bit generation. Sufficient amount of random bits can be supplied by the pseudorandom number generator using Deterministic Random Bit Generator (DRBG) provided that unknown input with high entropy is used as an initial value of DRBG. However the research on creating the unknown value, called seed, has not been received less attention. NIST is preparing for a noticeable document on the recommendation of entropy sources for random bit generation including noise sources such as thermal noise or hard drive seek times.