Security analysis of the SCO-family using key schedules

被引：4
|
作者：
Jeong, Kitae [2 ]
Lee, Changhoon [1 ]
Kim, Jongsung [3 ]
Hong, Seokhie [2 ]
机构：
[1] Hanshin Univ, Sch Comp Engn, Hanshin, South Korea
[2] Korea Univ, CIST, Seoul, South Korea
[3] Kyungnam Univ, Dept E Business, Kyungnam, South Korea
来源：
INFORMATION SCIENCES | 2009年 / 179卷 / 24期
关键词：
Block ciphers; SCO-family; SCO-1; SCO-2; SCO-3; Data dependent operation; Related-key differential attack; Cryptanalysis; ATTACKS; CRYPTANALYSIS; SPECTR-H64;
D O I：
10.1016/j.ins.2009.08.009
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
The COS-based ciphers SCO-1, SCO-2 and SCO-3 (called the SCO-family) have been designed to improve the security of DDP-based ciphers which are all broken by related-key attacks. In this paper we show that the SCO-family is still vulnerable to related-key attacks: we present related-key differential attacks on a full-round SCO-1, a full-round SCO-2 and an 11-round reduced SCO-3, respectively. The attack on SCO-1 requires 2(61) related-key chosen ciphertexts and 2(120.59) full-round SCO-1 decryptions. For the attack on SCO-2, we require 2(59) related-key chosen plaintexts and 2(118.42) full-round SCO-2 encryptions, and the 11-round attack on SCO-3 works with 2 58 related-key chosen plaintexts and 2(117.54) 11-round SCO-3 encryptions. This work is the first known cryptanalytic results on the SCO-family. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码：4232 / 4242
页数：11
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