Differential-linear cryptanalysis of serpent

Eli Biham; Orr Dunkelman; Nathan Keller

doi:10.1007/978-3-540-39887-5_2

Differential-linear cryptanalysis of serpent

Eli Biham, Orr Dunkelman, Nathan Keller

Research output: Contribution to journal › Article › peer-review

Abstract

Serpent is a 128-bit SP-Network block cipher consisting of 32 rounds with variable key length (up to 256 bits long). It was selected as one of the 5 AES finalists. The best known attack so far is a linear attack on an 11-round reduced variant. In this paper we apply the enhanced differential-linear cryptanalysis to Serpent. The resulting attack is the best known attack on 11-round Serpent. It requires 2^125.3 chosen plaintexts and has time complexity of 2^139.2. We also present the first known attack on 10-round 128-bit key Serpent. These attacks demonstrate the strength of the enhanced differential-linear cryptanalysis technique.

Original language	English
Pages (from-to)	9-21
Number of pages	13
Journal	Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume	2887
DOIs	https://doi.org/10.1007/978-3-540-39887-5_2
State	Published - 2003
Externally published	Yes

ASJC Scopus subject areas

Theoretical Computer Science
General Computer Science

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10.1007/978-3-540-39887-5_2

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title = "Differential-linear cryptanalysis of serpent",

abstract = "Serpent is a 128-bit SP-Network block cipher consisting of 32 rounds with variable key length (up to 256 bits long). It was selected as one of the 5 AES finalists. The best known attack so far is a linear attack on an 11-round reduced variant. In this paper we apply the enhanced differential-linear cryptanalysis to Serpent. The resulting attack is the best known attack on 11-round Serpent. It requires 2125.3 chosen plaintexts and has time complexity of 2139.2. We also present the first known attack on 10-round 128-bit key Serpent. These attacks demonstrate the strength of the enhanced differential-linear cryptanalysis technique.",

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Differential-linear cryptanalysis of serpent

Abstract

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