# Tag Info

## New answers tagged entropy

0

One thing you can do if you are not too concerned about losing some entropy is this: For the numbers 0 through 9, divide them evenly into two groups. Assign a 0 bit to any number that occurs in the first group, and a 1 bit for any number that occurs in the second group. For example: 0 = 0 1 = 0 2 = 0 3 = 0 4 = 0 5 = 1 6 = 1 7 = 1 8 = 1 9 = 1 Or you might ...

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Germany's BSI has produced AIS 31 that includes requirements on Physical True RNGs (PTRNGs). It is designed to fill a gap in the Common Criteria standard. Chapter 4 describes pre-defined classes for physical true, non-physical true, deterministic and hybrid random number generators. ... The basic concepts and evaluation criteria are illustrated by ...

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As far as I can tell, NIST has only one official document about entropy collection. SP-800-90B. The purpose of NIST Special Publication (SP) 800-90B is to specify the design and testing requirements for entropy sources that can be validated as approved entropy sources by NIST‘s CAVP and CMVP. It essentially defines a bunch of statistical tests to ...

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/dev/urandom itself is an acceptable crypto-quality (P)RNG. Therefore it can't hurt security to call it as often as you want. Assuming that /dev/urandom operates correctly (i.e. returns bit that cannot be predicted), the probability for an observer to correctly predict the bits generated by drbgFromSeed decreases (very slowly) with the number of generated ...

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Partition the file into blocks of almost-equal size, and let $B$ denote the maximum block size (in bits). $\:$ Choose a randomness extractor whose outputs are long enough to sample from the blocks and still have $B$ bits of the output left over. Choose a seed for the extractor (unless you choose an extractor that doesn't actually use one). For each ...

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