What is "macguffin"

In fiction, a MacGuffin (sometimes McGuffin or maguffin) is a plot device in the form of some goal, desired object, or other motivator that the protagonist pursues, often with little or no narrative explanation. The specific nature of a MacGuffin is typically unimportant to the overall plot. The most common type of MacGuffin is an object, place, or person. Other more abstract types include money, victory, glory, survival, power, love, or some unexplained driving force.

The MacGuffin technique is common in films, especially s. Usually the MacGuffin is the central focus of the film in the first act, and thereafter declines in importance. It may reappear at the climax of the story but sometimes is actually forgotten by the end of the story. Multiple MacGuffins are sometimes derisively identified as plot coupons.

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.