Pseudorandom number generators | Stream ciphers

Shrinking generator

In cryptography, the shrinking generator is a form of pseudorandom number generator intended to be used in a stream cipher. It was published in Crypto 1993 by Don Coppersmith, Hugo Krawczyk, and . The shrinking generator uses two linear-feedback shift registers. One, called the A sequence, generates output bits, while the other, called the S sequence, controls their output. Both A and S are clocked; if the S bit is 1, then the A bit is output; if the S bit is 0, the A bit is discarded, nothing is output, and the registers are clocked again. This has the disadvantage that the generator's output rate varies irregularly, and in a way that hints at the state of S; this problem can be overcome by buffering the output. The random sequence generated by LFSR can not guarantee the unpredictability in secure system and various methods have been proposed to improve its randomness Despite this simplicity, there are currently no known attacks better than exhaustive search when the feedback polynomials are secret. If the feedback polynomials are known, however, the best known attack requires less than A â€ĸ S bits of output. A variant is the self-shrinking generator. (Wikipedia).

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From playlist Science Projects

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From playlist ELECTROMAGNETISM

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From playlist Ecole d'ÊtÊ 2021 - Curvature Constraints and Spaces of Metrics

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From playlist Ecole d'ÊtÊ 2021 - Curvature Constraints and Spaces of Metrics

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From playlist Probabilistic Methods in Negative Curvature - 2019

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From playlist MATRIX-SMRI Symposium: Singularities in Geometric Flows

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From playlist Informal Geometric Analysis Seminar

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march29

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From playlist MIT 6.849 Geometric Folding Algorithms, Fall 2012

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Related pages

Alternating step generator | Linear-feedback shift register | Pseudorandom number generator | Self-shrinking generator | Stream cipher | Timing attack | FISH (cipher) | Bit | Cryptography