Research On Reliability And Security Of Data Storage Technology In Cloud Computing

The concept of cloud computing service is based on a variety of traditional Internet technologies.Virtualization and distribution technology as two core technologies are designed to provide excellent computing power,great storage capacity and scalability for cloud computing.It rapidly dominates the market because of all the significant improvements including the performance and convenience that it born with.Cloud storage is a new kind of service evolving from the storage-as-a-service in cloud computing.It is becoming increasingly important because the core of cloud computing is turning from compute-centric to storage-centric.While it makes a great difference in cloud computing,the openness feature of cloud storage is also threatening the security and privacy of user data,which is the main issue when implementing an instance of cloud storage.Thus the purpose of the thesis focuses on the security of user privacy and data,data integrity and availability,storage efficiency in the cloud storage environment.In order to improve the security and integrity performance of the data in the cloud storage,this thesis designed a de-duplication,encrypted,backup storage system,referred as DEBS system.The DEBS is a system which achieved all functions that multi-user data de-duplication,user privacy and data encryption,data redundant backup for recovery need.Firstly the DEBS uses Message-Lock Encryption(MLE)method to encrypt data and delete the duplication at the same time.Nevertheless,MLE could be cracked by brute force if the system is small.So that's why DEBS uses the RSA Blind Signatures to make up for the defects of MLE because of the unpredictability of the files' keys.Secondly,the storage server uses RS code for encoding user files to several data chunks.After that the storage server stores those chunks into multiple nodes to ensure the data integrity and improve DEBS's tolerance of disaster.Lastly,the DEBS adds the confusion strategy into traditional security layer to disrupt the database in order to ensure the security of data in database.Finally,the thesis designed a multi-user web system based on Java SSH framework to simulate the data stored in the cloud.In addition,this web system used a server-side file system and confused MySQL database to simulate the secure data storage in the distributed file system.Furthermore,it imitates the user's operation of account registering,login,file uploading and downloading to verify the reliability of the DEBS's functions.