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What is the basis for the FISH algorithm?

What is the basis for the FISH algorithm?
A . The Lagged Fibonacci generator
B. Prime number theory
C. Equations that describe an ellipse
D. The difficulty in factoring numbers

Answer: A

Explanation:

The Lagged Fibonacci generator

https://en.wikipedia.org/wiki/FISH_(cipher)

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.

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