Multi-user Searchable Encryption Scheme with Constant-Size Keys

Cloud storage is widely adopted nowadays. Considering about the data leakage issue, people encrypted the data before uploading them to cloud server. However, due to the loss of data's original properties, it is hard to search the encrypted data directly. To solve this problem, searchable encryption scheme has been proposed to search the data stored on the Cloud server in ciphertext domain. To enhance the searchable encryption scheme's practicability, we propose a scheme, which has constant-size keys, to decrease the corresponding storage requirement. In this work, we also provide efficient mechanisms for the participation and revocation of a user. Therefore, it can be easily applied to storage systems of a University or a cooperate user. Moreover, a prototype based on the proposed scheme has been built to verify the feasibility of our work.