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How to Generate Cryptographically Strong Sequences of Pseudorandom Bits

Blum, Manuel, Micali, Silvio·1984·SIAM Journal on Computing

Abstract

We give a set of conditions that allow one to generate 50–50 unpredictable bits.Based on those conditions, we present a general algorithmic scheme for constructing polynomial-time deterministic algorithms that stretch a short secret random input into a long sequence of unpredictable pseudo-random bits. We give an implementation of our scheme and exhibit a pseudo-random bit generator for which any efficient strategy for predicting the next output bit with better than 50–50 chance is easily transformable to an “equally efficient” algorithm for solving the discrete logarithm problem. In particular: if the discrete logarithm problem cannot be solved in probabilistic polynomial time, no probabilistic polynomial-time algorithm can guess the next output bit better than by flipping a coin: if “head” guess “0”, if “tail” guess “1”

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Metadata

Authors
Blum, M., & Micali, S.
Venue
SIAM Journal on Computing
Published
1984-11
Volume
13
Issue
4
Pages
850-864
ISSN
  • 0097-5397 (ISSN-L)
  • 1095-7111
OpenAlex
W2164284862
Cited by
1,322
References
2
FWCI
19.14
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: How to Generate Cryptographically Strong Sequences of Pseudorandom Bits. https://app.cochat.ai/papers/10.1137/0213053
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Blum, M., & Micali, S. (1984). How to Generate Cryptographically Strong Sequences of Pseudorandom Bits. SIAM Journal on Computing. https://doi.org/10.1137/0213053

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.