Pike (cipher)
Encyclopedia
The Pike stream cipher
Stream cipher
In cryptography, a stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream . In a stream cipher the plaintext digits are encrypted one at a time, and the transformation of successive digits varies during the encryption...

 was invented by Ross Anderson to be a "leaner and meaner" version of FISH
FISH (cipher)
The FISH 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...

 after he broke FISH in 1994; the name is a humorous allusion to the Pike fish. The cipher combines ideas from A5 with the Lagged Fibonacci generator
Lagged Fibonacci generator
A Lagged Fibonacci generator is an example of a pseudorandom number generator. This class of random number generator is aimed at being an improvement on the 'standard' linear congruential generator...

s used in FISH. It is about 10% faster than FISH, yet believed to be much stronger. It potentially has a huge key length, and no attacks have been published .
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