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The NonStop Entropy Process (NEP) provides a high quality cryptographic random data source for HP NonStop systems. The NEP process runs as a fault tolerant process pair in the Guardian environment and uses the OpenSSL cryptographically secure pseudo-random number generator (PRNG) as its random data source. The process continuously gathers entropy from various system sources that are frequently changing and unpredictable and mixes it into the PRNG state. Random data is made available to applications via an easy to use static API library, or the NEP process may be queried directly using the industry standard EGD message protocol via the Guardian interprocess message system.

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