MacGuffin (cipher)

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MacGuffin

The Feistel function of the MacGuffin cipher
General
Designers	Bruce Schneier, Matt Blaze
First published	1994-12-14
Derived from	DES
Cipher detail
Key sizes	128 bits
Block sizes	64 bits
Structure	Unbalanced Feistel network
Rounds	32

In cryptography, MacGuffin is a block cipher created in 1994 by Bruce Schneier and Matt Blaze at a Fast Software Encryption workshop. It was intended as a catalyst for analysis of a new cipher structure, known as Generalized Unbalanced Feistel Networks (GUFNs). The cryptanalysis proceeded very quickly, so quickly that the cipher was broken at the same workshop by Vincent Rijmen and Bart Preneel.