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.
This cryptography-related article is a stub.