Differential attack on five rounds of the SC2000 block cipher

J. Lu

doi:10.1007/978-3-642-16342-5_4

Differential attack on five rounds of the SC2000 block cipher

J. Lu

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

2 Citations (Scopus)

Abstract

SC2000 is a 128-bit block cipher with a user key of 128, 192 or 256 bits, which employs a total of 6.5 rounds if a 128-bit user key is used. It is a CRYPTREC recommended e-government cipher. In this paper we describe one 4.75-round differential characteristic with probability $2^{126}$ of SC2000 and thirty 4.75-round differential characteristics with probability $2^{¿127}$. Finally, we exploit these 4.75-round differentials to conduct a differential cryptanalysis attack on a 5-round reduced version of SC2000 when used with a 128-bit key. The attack suggests for the first time that the safety margin of SC2000 with a 128-bit key decreases below one and a half rounds.

Original language	English
Title of host publication	Information Security and Cryptology (5th International Conference, Inscrypt 2009, Beijing, China, December 12-15, 2009. Revised Selected Papers)
Editors	F. Bao, M. Yung
Place of Publication	Berlin
Publisher	Springer
Pages	50-59
ISBN (Print)	978-3-642-16341-8
DOIs	https://doi.org/10.1007/978-3-642-16342-5_4
Publication status	Published - 2010

Publication series

Name	Lecture Notes in Computer Science
Volume	6151
ISSN (Print)	0302-9743

Cite this

Lu, J. (2010). Differential attack on five rounds of the SC2000 block cipher. In F. Bao, & M. Yung (Eds.), Information Security and Cryptology (5th International Conference, Inscrypt 2009, Beijing, China, December 12-15, 2009. Revised Selected Papers) (pp. 50-59). (Lecture Notes in Computer Science; Vol. 6151). Berlin: Springer. https://doi.org/10.1007/978-3-642-16342-5_4

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Differential attack on five rounds of the SC2000 block cipher. / Lu, J.

Information Security and Cryptology (5th International Conference, Inscrypt 2009, Beijing, China, December 12-15, 2009. Revised Selected Papers). ed. / F. Bao; M. Yung. Berlin : Springer, 2010. p. 50-59 (Lecture Notes in Computer Science; Vol. 6151).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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AB - SC2000 is a 128-bit block cipher with a user key of 128, 192 or 256 bits, which employs a total of 6.5 rounds if a 128-bit user key is used. It is a CRYPTREC recommended e-government cipher. In this paper we describe one 4.75-round differential characteristic with probability $2^{126}$ of SC2000 and thirty 4.75-round differential characteristics with probability $2^{¿127}$. Finally, we exploit these 4.75-round differentials to conduct a differential cryptanalysis attack on a 5-round reduced version of SC2000 when used with a 128-bit key. The attack suggests for the first time that the safety margin of SC2000 with a 128-bit key decreases below one and a half rounds.

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Access to Document

10.1007/978-3-642-16342-5_4