Research On Integrity Audit Mechanism Of Cloud Storage To Protect Privacy

Remote data integrity checking(RDIC)is a common method to detect data integrity.Due to the huge network space resources of cloud storage,usually the data uploaded by users will be saved in the cloud server side and will not retain the local copy.When users need,users can download and review the data stored in the cloud anytime and anywhere,which greatly improves the efficiency and convenience users access data.However,in order to cope with more and more heavy storage burden,some malicious cloud servers will intentionally delete or mistakenly delete some file data that users do not often access.Because of the huge amount of data,users need to detect whether there is data loss or not,which brings great trouble to users.Therefore,in order to effectively solve this problem and make full use of more computing resources,users usually allow a third party auditor(TPA)to perform data integrity audit.In the process of users uploading data,there are also some illegal malicious users deliberately upload some garbage file data to make network congestion or denial of service attacks,which brings huge pressure to the operation of cloud servers.Therefore,before uploading data,verification of user identity rationality is a common method to solve this problem.However,the following problems are user identity exposure and privacy revelation.In order to solve this problem,this thesis proposes a data integrity detection scheme with undeniable signature for RDIC.This scheme combines the advantages of(Provable Data Possession(PDP)and undeniable signature,which can detect the validity of identity before uploading data and guarantee the privacy information of user's identity through zero knowledge proof.According to the property of undeniable signature,the server can verify the legitimacy of user's identity and can not prove the authenticity of user's identity to the third party.It can also guarantee a lower level of time cost and calculation cost in the communication calculation,which is more suitable for the characteristics of RDIC.In addition,in the process of third-party audit and detection,this thesis uses the way of information hiding method to treat the user's data confidentially.TPA can select the cloud data randomly according to the user's needs for integrity test.For cloud server,it can not get the tested user's information.Therefore this thesis can achieve two-way confidentiality.