FISH (cipher)

Short description: Stream cipher

The FISH (FIbonacci SHrinking) stream cipher is a fast software based stream cipher using Lagged Fibonacci generators, plus a concept from the shrinking generator cipher. It was published by Siemens in 1993. FISH is quite fast in software and has a huge key length. However, in the same paper where he proposed Pike, Ross Anderson showed that FISH can be broken with just a few thousand bits of known plaintext.

## References

* Blöcher, Uwe; Dichtl, Markus (1994), "Fish: A fast software stream cipher", Fast Software Encryption, Lecture Notes in Computer Science, 809, Springer-Verlag, pp. 41–44, doi:10.1007/3-540-58108-1_4, ISBN 978-3-540-58108-6 .
* Anderson, Ross J. (1995), "On Fibonacci keystream generators", Fast Software Encryption, Lecture Notes in Computer Science, 1008, Springer-Verlag, pp. 346–352, doi:10.1007/3-540-60590-8_26, ISBN 978-3-540-60590-4 .

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Stream ciphers

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Theory|

* shift register
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* correlation attack
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