Security control scheme for cloud data copy based on differential privacy model

Abstract

In cloud computing environment,adversary may use data deduplication as a side channel to eavesdrop users’ privacy.In order to tackle this serious issue,a secure copy number control scheme was proposed.The highlights of the proposed scheme lie in constructing a hybrid cloud framework.Then file was encrypted for second times by using the privacy protection parameters of differential privacy as well as the key of the file computed by convergent encryption algorithm.After the file is uploaded,each file has only one copy in the server.Meanwhile,compared with the scheme that use setting threshold value to control the number of copies,the proposed scheme can resist against the side channel attack,related files attack,and the specific attack of encryption algorithm and save the network bandwidth and disk storage space.

Keywords

• data deduplication;differential privacy;convergent encryption;hybrid cloud;side channel attack