Improved integral cryptanalysis of SPNbox in digital rights management systems
Abstract As an access control technology of digital material, digital rights management systems have a profound effect on the copyright protection of digital content. To address the threat of key exposure, applying white‐box ciphers is effective to provide a security guarantee for digital rights man...
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| Format: | Article |
| Language: | English |
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Wiley
2023-01-01
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| Series: | IET Information Security |
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| Online Access: | https://doi.org/10.1049/ise2.12087 |
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| author | Jun Liu Dachao Wang Yupu Hu Jie Chen Baocang Wang |
| author_facet | Jun Liu Dachao Wang Yupu Hu Jie Chen Baocang Wang |
| author_sort | Jun Liu |
| collection | DOAJ |
| description | Abstract As an access control technology of digital material, digital rights management systems have a profound effect on the copyright protection of digital content. To address the threat of key exposure, applying white‐box ciphers is effective to provide a security guarantee for digital rights management systems. SPNbox, proposed at Asiacrypt’16 is such a white‐box cipher that fulfils comprehensive resistance against key exposure for digital rights management systems, including black‐box security on the server‐side and white‐box security on the client‐side. So far, the previous integral cryptanalysis of SPNbox employs a general 2‐round distinguisher without considering the details of SPNbox. The properties of SPNbox are carefully explored and a novel 2‐round integral distinguisher is introduced. On this basis, we propose new competitive 3‐round key recovery attacks with lower complexities. Particularly, the improved attack on 3‐round SPNbox‐32 only requires 232 chosen plaintexts, whereas the current best attack necessitates 262 chosen plaintexts. In addition, integral attacks on 4‐ and 5‐round SPNbox‐8 are presented for the first time. Thus, the security margin of SPNbox‐8 is narrowed by two rounds. These results indicate that the capability of SPNbox resisting integral cryptanalysis is inferior to the designers' claim. |
| format | Article |
| id | doaj-art-5f7cff42742a40d692023f0387c847bd |
| institution | Kabale University |
| issn | 1751-8709 1751-8717 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Information Security |
| spelling | doaj-art-5f7cff42742a40d692023f0387c847bd2025-02-03T06:45:06ZengWileyIET Information Security1751-87091751-87172023-01-0117114715810.1049/ise2.12087Improved integral cryptanalysis of SPNbox in digital rights management systemsJun Liu0Dachao Wang1Yupu Hu2Jie Chen3Baocang Wang4State Key Laboratory of Integrated Service Networks Xidian University Xi'an ChinaState Key Laboratory of Integrated Service Networks Xidian University Xi'an ChinaState Key Laboratory of Integrated Service Networks Xidian University Xi'an ChinaState Key Laboratory of Integrated Service Networks Xidian University Xi'an ChinaState Key Laboratory of Integrated Service Networks Xidian University Xi'an ChinaAbstract As an access control technology of digital material, digital rights management systems have a profound effect on the copyright protection of digital content. To address the threat of key exposure, applying white‐box ciphers is effective to provide a security guarantee for digital rights management systems. SPNbox, proposed at Asiacrypt’16 is such a white‐box cipher that fulfils comprehensive resistance against key exposure for digital rights management systems, including black‐box security on the server‐side and white‐box security on the client‐side. So far, the previous integral cryptanalysis of SPNbox employs a general 2‐round distinguisher without considering the details of SPNbox. The properties of SPNbox are carefully explored and a novel 2‐round integral distinguisher is introduced. On this basis, we propose new competitive 3‐round key recovery attacks with lower complexities. Particularly, the improved attack on 3‐round SPNbox‐32 only requires 232 chosen plaintexts, whereas the current best attack necessitates 262 chosen plaintexts. In addition, integral attacks on 4‐ and 5‐round SPNbox‐8 are presented for the first time. Thus, the security margin of SPNbox‐8 is narrowed by two rounds. These results indicate that the capability of SPNbox resisting integral cryptanalysis is inferior to the designers' claim.https://doi.org/10.1049/ise2.12087digital rights managementintegral cryptanalysisSPNboxwhite‐box cipher |
| spellingShingle | Jun Liu Dachao Wang Yupu Hu Jie Chen Baocang Wang Improved integral cryptanalysis of SPNbox in digital rights management systems IET Information Security digital rights management integral cryptanalysis SPNbox white‐box cipher |
| title | Improved integral cryptanalysis of SPNbox in digital rights management systems |
| title_full | Improved integral cryptanalysis of SPNbox in digital rights management systems |
| title_fullStr | Improved integral cryptanalysis of SPNbox in digital rights management systems |
| title_full_unstemmed | Improved integral cryptanalysis of SPNbox in digital rights management systems |
| title_short | Improved integral cryptanalysis of SPNbox in digital rights management systems |
| title_sort | improved integral cryptanalysis of spnbox in digital rights management systems |
| topic | digital rights management integral cryptanalysis SPNbox white‐box cipher |
| url | https://doi.org/10.1049/ise2.12087 |
| work_keys_str_mv | AT junliu improvedintegralcryptanalysisofspnboxindigitalrightsmanagementsystems AT dachaowang improvedintegralcryptanalysisofspnboxindigitalrightsmanagementsystems AT yupuhu improvedintegralcryptanalysisofspnboxindigitalrightsmanagementsystems AT jiechen improvedintegralcryptanalysisofspnboxindigitalrightsmanagementsystems AT baocangwang improvedintegralcryptanalysisofspnboxindigitalrightsmanagementsystems |