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Eremeev, M. A.; Moldovyan, Alexander A.; Moldovyan, Nikolay A.

doi:10.1023/a:1021651617432

Cited by 1 publication

(4 citation statements)

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“…While the operational permutation blocks (RC5, RC6, etc. [3]) still remain limitations in protective data transformation, COSB-128 [8] is a 128-bit block and 256-bit key, which uses the controllable operational substitutions in the concept of CPB [9], is proposed to give a good performance and be stable to most known cryptanalyses.…”

Section: Discussionmentioning

confidence: 99%

“…Firstly, we notice some notations using through the whole paper. The cipher A=false(a1,a2,…,anfalse) is assigned with a1 and an being the most significant bit and the least significant bit, respectively: ΔXr: the input difference in round r ; ΔKr: the round-key difference in round r ; ΔYr: the output difference in round r ; ei,j: the i th bit and j th bit are ones; the others are zeros within a cipher (e.g., e2,5=false(0,1,0,0,1,0,…,0false)). COSB-128 [8] is a 128-bit block cipher using 256-bit secret key; the number of round is 10. The ciphers do the same iterative structure with the round function Crypt(e) (...…”

Section: Description Of Cosb-128 Block Ciphermentioning

confidence: 99%

“…The round function Crypt (0) is given in Figures 1 and 2. For more detailed description of COSB-128, see [8].…”

Section: Description Of Cosb-128 Block Ciphermentioning

confidence: 99%

“…COSB-128 [8] is a 128-bit block cipher with a 256-bit key; the number of round is 10. It uses controlled operational substitution (COS) with the concept of fast controllable permutation blocks (CPB) [9].…”

Section: Introductionmentioning

confidence: 99%

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Related-Key Differential Attacks on COSB-128

Tran

Lee

2015

International Journal of Distributed Sensor Networks

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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.

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Section: Discussionmentioning

confidence: 99%