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* Random number generator (RNG) module documentation file.
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* @addtogroup rng_module Random number generator (RNG) module
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* The Random number generator (RNG) module provides random number
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* generation, see \c ctr_dbrg_random() or \c havege_random().
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* The former uses the block-cipher counter-mode based deterministic random
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* bit generator (CTR_DBRG) as specified in NIST SP800-90. It needs an external
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* source of entropy. For these purposes \c entropy_func() can be used. This is
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* an implementation based on a simple entropy accumulator design.
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* The latter random number generator uses the HAVEGE (HArdware Volatile
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* Entropy Gathering and Expansion) software heuristic which is claimed
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* to be an unpredictable or empirically strong* random number generation.
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* \* Meaning that there seems to be no practical algorithm that can guess
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* the next bit with a probability larger than 1/2 in an output sequence.
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* This module can be used to generate random numbers.