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Adding local short description: "Attack applicable to block and stream ciphers", overriding Wikidata description "partitioning attack applicable to block and stream ciphers" |
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{{Short description|Attack applicable to block and stream ciphers}}
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In [[cryptography]], '''mod ''n'' cryptanalysis''' is an [[cryptanalysis|attack]] applicable to [[block cipher|block]] and [[stream cipher]]s. It is a form of [[partitioning cryptanalysis]] that exploits unevenness in how the [[cipher]] operates over [[equivalence class]]es (congruence classes) [[modular arithmetic|modulo ''n'']]. The method was first suggested in 1999 by [[John Kelsey (cryptanalyst)|John Kelsey]], [[Bruce Schneier]], and [[David A. Wagner|David Wagner]] and applied to RC5P (a variant of [[RC5]]) and [[M6 (cipher)|M6]] (a family of block ciphers used in the [[FireWire]] standard). These attacks used the properties of binary addition and bit rotation modulo a [[Fermat prime]].
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