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.

[edit] References

• Uwe Blöcher and Markus Dichtl, Fish: A Fast Software Stream Cipher, Fast Software Encryption 1993, pp41–44.
• Ross J. Anderson, On Fibonacci Keystream Generators, Fast Software Encryption 1994, pp346–352.

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