Existing attribute-based encryption schemes which support online/offline outsourcing encryption and decryption can realize fine-grained access control and data confidentiality

but it cannot achieve the expression of hierarchical relationships between the same attributes and prevent data from being tampered. Besides

the terminal needs to determine the user's access structure before offline encryption

and the intermediate ciphertext needs to be regenerated every time. Aiming at the above problems

this paper proposes a CP-WABE (Ciphertext-Policy Weighted Attribute-Based Encryption) scheme supports offline/online encryption and verifiable outsourced decryption. The scheme realizes the flexible expression of the hierarchical relation of the same attributes through the weight sets

which can realize the generation of intermediate ciphertext of the data with different access structure after one offline encryption

and complete the online encryption with only a small amount of overhead. At the same time

the correctness of outsourced decryption is verified. Finally

the security and performance of the scheme are analyzed

and the experimental simulation also shows that this paper has more advantages than the related schemes.