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| Cloud computing is a computing paradigm which can provide data storage and computing resources. But security and privacy issues have risen for its adoption. This paper presents an efficient, flexible, and fine-grained scheme at the scenario of the ciphertext-policy attribute-based encryption (CP-ABE). This proposed scheme not only reduces the length of secret keys and ciphertexts, but also ensures the security of backward and forward secrecy by adding the replacement of the random parameters in attribute adjunction/revocation process. Therefore, the efficiency of key generation, encryption, and decryption in our scheme is higher than the existed CP-ABE scheme's. As more and more businesses will be moved into the cloud, the paper presents a data sharing system based on the proposed scheme, along with the security analysis and preliminary efficiency analysis about the proposed scheme. |
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| Keywords:Cryptography; Attribute-Based Encryption; Cloud Computing; Attribute Adjunction; Attribute Revocation; Data sharing? |
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