Cloud storage searchable encryption method based on on-grid attribute bases

The invention provides a cloud storage searchable encryption method based on a lattice attribute base. The method comprises the following steps: generating a public key parameter Pk and a master key Msk of a system by an authorization authority (AA); a data owner (DO) using Pk to encrypt plaintext data containing keywords to respectively generate keyword ciphertext Ind and data ciphertext Ct, andendowing the keyword ciphertext Ind and the data ciphertext Ct with an attribute set S to be uploaded to a cloud (CS) together; the AA generating a private key Sk for a data accessor (DU), the DU submitting a query keyword to the AA and then generating a search token Token by the AA and returning the Token to the DU, the DU initiating a search request to the CS and uploading the Token to the cloud, and the CS judging whether the Token is matched with a keyword ciphertext Ind or not, and if yes, the next step being executed; otherwise, ending the algorithm DU to decrypt the ciphertext through the private key Sk generat