Twofish is a block cipher by Counterpane Labs, published in 1998. It was one of the five Advanced Encryption Standard (AES) finalists, and was not selected as AES.

Twofish has a 128bit block size, a key size ranging from 128 to 256 bits, and is optimized for 32bit CPUs. Currently there is no successful cryptanalysis of Twofish.

https://www.schneier.com/academic/two...

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