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The cipher combines ideas from A5 with the lagged Fibonacci generators 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 as of 2004[update].
- Ross Anderson, «On Fibonacci Keystream Generators», 1994.
- On Fibonacci Keystream Generators, Ross Anderson, 27-Jul-2006.