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| User Key Revocation Method for Multi-cloud Service Providers |
| Li Shuan-bao①②③ Wang Xue-rui④ Fu Jian-ming①② Zhang Huan-guo①② |
①(Key Lab of Aerospace Information Security and Trusted Computing Ministry of Education, Wuhan 430072, China)
②(School of Computer, Wuhan University, Wuhan 430072, China)
③(Henan College of Finance and Taxation, Zhengzhou 451464, China)
④(College of Computer Science and Technology of Henan Institute of Engineering, Zhengzhou 451191, China) |
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Abstract Key information leakage is one of the most serious problems in Intercloud service, to solve this problem, a scheme of user key revocation on attribute-based ring signatures is proposed. Focused on user ciphertext access in Intercloud, the mechanism of ciphertext matrixes mapping without attribute leakage is discussed, multi-authority can extend attribute sets for generation key, then full user attributes can not be acquired by Cloud Service Providers (CSP), thus overhead on attribute storage is reduced. In addition, user signature verification revocation based on revocable ring and monotone span programs is designed, which constitutes ring of CSPs, authorities and users. Receiving CSP can define ciphertext access structure, users can access ciphertext through source CSP verifying, and authorities can remove decryption key from attribute-lost users without affecting any other users. The mechanism of collusion resistance with integrating attributes on the basis of Ciphertext-Policy Attribute Base Encryption (CP-ABE) and monotone span programs is discussed, with which user attribute confidentiality can be protected from leakage. Finally, to prove the effectiviness of the proposed model, the performance analysis of communication cost and computational efficiency are verified.
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Received: 03 February 2015
Published: 26 June 2015
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Corresponding Authors:
Li Shuan-bao
E-mail: phdfuli@whu.edu.cn
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