A deterministic generator designed so observed output does not feasibly reveal past or future output when it is seeded and reseeded correctly.
Cryptographically secure PRNG is best understood as part of a system rather than as an isolated definition. Its related coordinates show the mechanisms, incentives and historical records that give the term practical meaning.
Cryptographically secure PRNG should be evaluated against a concrete threat model: what is protected, from whom, for how long and at what operational cost. A design may remove one dependency while introducing another, so custody, privacy and verification must be judged as a complete system.
Understanding Cryptographically secure PRNG helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
For the clearest picture, read this entry together with Random-number generator, Cryptographic entropy, Hardware true random-number generator, Deterministic PRNG. The reverse links also lead from Cryptographic entropy, Random-number generator, Deterministic PRNG.
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Grounded in source data
Explains function and trade-offs
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