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Glossary Math & Statistics

Pseudo-random number

A pseudo-random number comes from a deterministic algorithm that starts from a seed and produces a sequence that looks random and passes statistical tests.

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In more detail

The same seed always gives the same sequence, which is useful for reproducible tests and simulations. For passwords, keys and tokens use a cryptographically secure generator fed by operating-system Entropy instead. See How Randomness and Fair Draws Work.

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See also

  • Glossary Entropy
    In security, entropy measures how unpredictable something is, such as a password or key, usually expressed in bits.
  • Glossary Probability
    Probability is a number from 0 (impossible) to 1 (certain) that measures how likely an event is.
  • Guide How Randomness and Fair Draws Work
    Pseudo-random versus secure randomness, modulo bias, why naive shuffles are biased, streaks, exact lottery.
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