An Attribute-Based Encryption Scheme Based on Unrecognizable Trapdoors |
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Institution: | Cyberspace Security and Computer College, Hebei University, Baoding 071002,China;Key Laboratory on High Trusted Information System in Hebei Province, Baoding 071002,China;Cyberspace Security and Computer College, Hebei University, Baoding 071002,China;Key Laboratory on High Trusted Information System in Hebei Province, Baoding 071002, China |
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Abstract: | Attribute-Based Encryption (ABE) has been widely used for ciphertext retrieval in the cloud environment.However,bi-flexible attribute control and privacy keywords are difficult problems that have yet to be solved.In this paper,we introduce the denial of access policy and the mutual matching algorithm of a dataset used to realize bidirectional control of attributes in the cloud server.To solve the problem of keyword privacy,we construct a security trapdoor by adding random numbers that effectively resist keyword guessing attacks from cloud servers and external attackers.System security is reduced to the Deterministic Bilinear Diffie-Hellman (DBDH) hypothesis problem.We validate our scheme through theoretical security analysis and experimental verification.Experiments are conducted on a real dataset,and results show that the scheme has higher security and retrieval efficiency than previous methods. |
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