| Summary: | Hidden access structure is a secure operation of Ciphertext Policy Attribute Base Encryption(CP-ABE),which can effectively prevent the leakage of sensitive information.However,tree access structure used by existing CP-ABE schemes are either completely open or completely hidden,which results in poor policy confidentiality and a large amount of encryption and decryption computation.To address the problem,this paper proposes a CP-ABE scheme to selectively hide the tree access structure.The mutual information method is used to extract sensitive attribute features,filter and hide the attributes that contain the original attribute set information in the access structure,so that the selectively hidden structure has the same security as the fully hidden structure.At the same time,the decryption ability of users is judged at the lowest matching cost,so that the users without decryption ability give up decryption as early as possible.Analysis results show that compared with the schemes using open access or fully hidden access structure,the proposed scheme has higher security and less computation.
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