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• 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 any of several German teleprinter ciphers used during World War II. One, called Schlusselzusatz and " Tunny" by Bletchley ParkBletchley Park BP was the site of a secret British military intelligence operation during and just before World War II (WWII). The site was named after the mansion in the grounds of which it was established. While the mansion was part of the operation, ma, was from Lorenz Electric. The other, called GeheimfernschreiberNational Cryptologic Museum. The Siemens Geheimfernschreiber cipher machine was a World War II German teleprinter stream cipher. The name is German for "secret teleprinter". While the Enigma machine was generally used by field units, the Geheimfernschreib by the Germans was called " STURGEON" by Bletchley. The STURGEON cypher was also from by Siemens, and was broken by (among others) mathematicians who trained at the same university as Ross Anderson.

See also: Bletchley ParkBletchley Park BP was the site of a secret British military intelligence operation during and just before World War II (WWII). The site was named after the mansion in the grounds of which it was established. While the mansion was part of the operation, ma, Colossus computerThe Colossus was the first programmable (to a limited extent) digital electronic computer, used for breaking German Fish Cyphers, especially the Lorenz cipher. It was designed by Max Newman and associates of Bletchley Park, and was built by the British Po.