CACDP: Ciphertext access control method for cloud storage dynamic strategy

CACDP: Ciphertext access control method for cloud storage dynamic strategy

Zhang Zhao Feng Boyu Liu Weijie

The confidentiality of data is a difficult problem in the cloud storage environment, the access control technology based on ciphertext is an important way to solve this problem, in the current access control technology based on ciphertext, the high security demand of data and frequent policy update make the authority update of data owner and do be too expensive. Thus, the overall efficiency of the system is seriously restricted. To solve this problem, a cipher access control method for the dynamic strategy of cloud storage is proposed (cryptographic access controls strategy for dynamic policy, CACDP), This method proposes a key management mechanism based on binary trie tree, on the basis of which, based on ElGamal agent encryption mechanism and two-layer encryption strategy, the key and data update part cost is transferred to cloud to reduce the burden of do authority management. Improve the processing efficiency of do. Finally, the experimental results show that the proposed scheme can effectively reduce the performance cost caused by the policy update.

CACDP: Ciphertext access control method for cloud storage dynamic strategy