FISH (cipher)

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For the British code-word for World War II German stream cipher teleprinter secure communications devices, see Fish (cryptography).

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.


  • Blöcher, Uwe; Dichtl, Markus (1994), "Fish: A fast software stream cipher", Proc. Fast Software Encryption 1993, Lecture Notes in Computer Science 809, Springer-Verlag, pp. 41–44, doi:10.1007/3-540-58108-1_4 .
  • Anderson, Ross J. (1995), "On Fibonacci keystream generators", Proc. Fast Software Encryption 1994, Lecture Notes in Computer Science 1008, Springer-Verlag, pp. 346–352, doi:10.1007/3-540-60590-8_26 .