Abstract
With the popular application of cloud storage and the diversification of terminal devices, especially the widespread popularization of smart terminals. Users have more and more requirements for how to access information in the cloud safely and efficiently. Ciphertext policy attribute-based encryption (CP-ABE) is an effective method to achieve fine-grained access control of cloud data. However, the large decryption overhead is a potential problem of attribute-based encryption. In this paper, a CP-ABE access control scheme based on proxy re-encryption is proposed, it helps markedly reduce the user’s decryption overhead. Meanwhile, attribute revocation is provided for key update while ensuring fine-grained access control, and an improved decryption key generation method is proposed, which solves the data leakage problem caused by illegal stealing private key in the traditional CP-ABE scheme. A comparison with other CP-ABE schemes shows that our scheme has better decryption performance for mobile devices accessing cloud data.
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