Related-Key Differential Attacks on COSB-128
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...
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| Format: | Article |
| Language: | English |
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Wiley
2015-09-01
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| Series: | International Journal of Distributed Sensor Networks |
| Online Access: | https://doi.org/10.1155/2015/617972 |
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| _version_ | 1849387132912664576 |
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| author | Song Dat Phuc Tran Changhoon Lee |
| author_facet | Song Dat Phuc Tran Changhoon Lee |
| author_sort | Song Dat Phuc Tran |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-32b8198297bc4b36b6b5899059d9ff4d |
| institution | Kabale University |
| issn | 1550-1477 |
| language | English |
| publishDate | 2015-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Distributed Sensor Networks |
| spelling | doaj-art-32b8198297bc4b36b6b5899059d9ff4d2025-08-20T03:55:22ZengWileyInternational Journal of Distributed Sensor Networks1550-14772015-09-011110.1155/2015/617972617972Related-Key Differential Attacks on COSB-128Song Dat Phuc TranChanghoon LeeCOSB-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.https://doi.org/10.1155/2015/617972 |
| spellingShingle | Song Dat Phuc Tran Changhoon Lee Related-Key Differential Attacks on COSB-128 International Journal of Distributed Sensor Networks |
| title | Related-Key Differential Attacks on COSB-128 |
| title_full | Related-Key Differential Attacks on COSB-128 |
| title_fullStr | Related-Key Differential Attacks on COSB-128 |
| title_full_unstemmed | Related-Key Differential Attacks on COSB-128 |
| title_short | Related-Key Differential Attacks on COSB-128 |
| title_sort | related key differential attacks on cosb 128 |
| url | https://doi.org/10.1155/2015/617972 |
| work_keys_str_mv | AT songdatphuctran relatedkeydifferentialattacksoncosb128 AT changhoonlee relatedkeydifferentialattacksoncosb128 |