A Scheme of Multi-authorization Access Control and User Attribute Revocation in Cloud Storage

The research of access control based on attribute encryption has been implemented in cloud storage, which is mostly based on single authorization center, may result in the leakage of key.Proposing a CP-ABE design of a multi access control scheme based on reference proxy server (Proxy Server, PS), to help users to undertake a large number of decryption operation; Problems with high security attributes revocation algorithm for processing; Finally, using the bilinear decision (Decision Bilinear Diffie-Hellman, DBDH) proved to be the chosen plaintext attack security.