FISH (cryptography)
The FISH stream cipher is a fast software based stream cipher using Lagged Fibonacci Generators, plus a concept from the shrinking generator cipher. The name is an acronym for "Fibonacci Shrinking". 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.
FISH was also the British code-name for German teleprinter ciphers used during World War II, including the Lorenz Schlusselzusatz ("Tunny") and the Geheimfernschreiber ("STURGEON"). See also Bletchley Park, Colossus computer.
