Security analysis of the SCO-family using key schedules☆

Jeong, Kwang Seob; Lee, Chang‐Hoon; Kim, Jongsung; Hong, Seokhie

doi:10.1016/j.ins.2009.08.009

Cited by 5 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Related-key differential cryptanalysis was introduced in 1994 by Biham [1, 2] and has become an effective and popular method for attacking many types of block ciphers. This attack researched on CIKS-cipher family [10], Cobra-cipher family [11], or SCO-cipher family [12]… has given a reasonable result with better performance.…”

Section: Introductionmentioning

confidence: 99%

Related-Key Differential Attacks on COSB-128

Tran

Lee

2015

International Journal of Distributed Sensor Networks

Self Cite

View full text Add to dashboard Cite

COSB-128 (Moldovyan et al., 2002) is a block cipher with 128-bit and 256-bit secret keys, which use key and data-dependent operational substitutions in fast controllable permutation blocks (CPB) concept. It is designed with a simple key schedule to ensure a high speed of data transformation by fast block encryption algorithms and expected to be high stability to all known methods of cryptanalysis, especially differential and linear attacks. In this paper, we show that the COSB-128 block cipher still remains weaknesses to differential related-key cryptanalysis, by constructing two full 10-round related-key differential characteristics (DCs) of COSB-128 with high probabilities, and thence propose our two related-key differential attacks. The attacks require about 2 24 data and time complexities to recover 63-bit key information and 2 22 data and time complexities to recover 6-bit key information. This study is the first known cryptanalytic result on COSB-128 until now. From this study, the new potential for the cryptanalysis on these types of block cipher will be further revealed.

show abstract