Editing MacGuffin (cipher) (section)

{{Short description|Block cipher}}
{{No footnotes|date=August 2023}}
{{Infobox block cipher
| name          = MacGuffin
| image         = [[Image:MacGuffinDiagram.png|center]]
| caption       = The Feistel function of the MacGuffin cipher
| designers     = [[Bruce Schneier]], [[Matt Blaze]]
| publish date  = 1994-12-14
| derived from  = [[Data Encryption Standard|DES]]
| derived to    = 
| key size      = 128 bits
| block size    = 64 bits
| structure     = Unbalanced [[Feistel network]]
| rounds        = 32
| cryptanalysis = 
}}

In [[cryptography]], '''MacGuffin''' is a [[block cipher]] created in 1994 by [[Bruce Schneier]] and [[Matt Blaze]] at a [[Fast Software Encryption|Fast Software Encryption workshop]]. It was intended as a catalyst for analysis of a new cipher structure, known as Generalized Unbalanced [[Feistel cipher|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]].