Dynamic Multi-Copy And Multi-Server Data Integrity Audit Research

Cloud storage services have the advantages of dynamic expansion,pay on demand and no geographical restrictions.As a result,more and more individuals and enterprises use cloud storage services to manage and process their own data.However,users lose direct control over the data after uploading the data to the cloud server and deleting local data.The data security of cloud storage naturally becomes the primary concern of users.Remote data integrity audit technology is an effective detection method when data is dam-aged.While early remote data integrity audit schemes are generally designed to check the integrity of one copy on a single cloud server.In this case,if most of files are damaged or the server crashes,it is difficult to recover the original files,resulting in irreparable losses.To solve the above problems,this paper studies the key technologies in remote data integrity audit,and puts forward two dynamic integrity audit schemes of multi-copy and multi-server.The results are as follows:· A dynamic data integrity audit scheme for multi-copy and multi-server.In this scheme,multiple copies are generated from one file and sent to different cloud servers.The scheme based on homomorphic verifiable tags can check the integrity of all copies in one challenge-response and resist copy-summation attacks simul-taneously.The scheme also supports public audit can be audited by a third party audit.The scheme supports block-level dynamic operations,such as modification,insertion and deletion using the mapped divide-and-conquer table.We then prove the security of our scheme,assuming the intractability of the computational Diffie-Hellman problem,in the random oracle model.We also compare our scheme with other schemes in performance to demonstrate its efficiency.· A remote data integrity audit scheme with data traceability for multi-copy and multi-server in electronic medical field.In the medical scene,doctors need to understand the patient's physical changes in addition to viewing the patient's current physical state.This scheme uses a marked map version table to realize dynamic operations and data tracing.The scheme can also resist copy-summation attacks.Moreover,the scheme uses certificateless signature,which can reduce the burden of certificate management and solve the problem of key escrow.We then give a security analy-sis,assuming the intractability of the computational Diffie-Hellman problem,in the random oracle model.We also give a comparison of our scheme with other schemes in performance which demonstrates its practicability in medical scene.