| In an attribute-based keyword searchable encryption scheme,the data owner can formulate an access policy and encrypt the data to ensure data security,construct a keyword index to ensure the privacy of the keyword search,and the user can secretly search for interest through keyword trapping.However,many existing searchable encryption schemes only support a single keyword search,and if the user’s attributes change,the ciphertext corresponding to the attribute needs to be updated in time,and most existing attribute-based encryption(ABE)schemes are in the user’s client.The end has a higher computational cost.These problems severely limit the application of attribute-based keyword searchable encryption schemes in practice.In response to these problems,this paper studies the attribute-based encryption scheme with attribute revocable and multikeyword search,and achieves the following results:(1)An attribute-based encryption scheme with outsourced private key verifiable and multikeyword searchable(VMKS-ABE)in cloud storage is proposed.This scheme can search multiple keywords and protect search privacy.That is,the cloud server can search for multiple keywords using keyword trapdoors,but does not know any information about the keywords searched.In addition,the solution outsources a large number of computing tasks to the cloud proxy server,greatly reducing the local computing burden.In addition,the program supports verification of the correctness of the outsourced private key.Finally,it is proved that the keyword index of the scheme is adaptive and safe under the general group model,and the ciphertext is safe under choose plaintext attack under the random oracle model.(2)A fine-grained access control scheme with attribute revocable and keyword searchable(ARKS-FAC)under fog calculation is proposed.The scheme implements a keyword search function,which can be applied to solve the problem that the user secretly finds the data of interest in a large number of databases;realizes the attribute revocation and outsources a large number of calculation tasks to the fog node.When the attribute is revoked,the scheme only needs to update the corresponding key and ciphertext of the attribute,which reduces the complexity and time of the calculation.Finally,based on the assumption of DBDH and BDH,the ciphertext in the scheme is proved to be chosen-plaintext attack security,and the keyword index is IND-CKA security. |
