Remote Data Integrity Checking in Cloud Computing

Cloud computing is an internet based computing which enables sharing of services. It is very challenging part to keep safely all required data that are needed in many applications for user in cloud. Storing our data in cloud may not be fully trustworthy. Since client doesn’t have copy of all stored data, he has to depend on Cloud Service Provider. This work studies the problem of ensuring the integrity and security of data storage in Cloud Computing.This paper, proposes an effective and flexible Batch Audit scheme with dynamic data support to reduce the computation overheads. To ensure the correctness of users data the task of allowing a third party auditor (TPA), on behalf of the cloud client, to verify the integrity of the data stored in the cloud.We consider symmetric encryption for effective utilization of outsourced cloud data under the model, it achieve the storage security in multi cloud data storage. The new scheme further supports secure and efficient dynamic operations on data blocks, including data insertion, update, delete and replacement. Extensive security and performance analysis shows that the proposed scheme is highly efficient and resilient against Byzantine failure, malicious data modification attack, and even server colliding attacks. Index Terms –Byzantine failure, Batch audit, data dynamics. ________________________________________________________*****______________________________________________________