Public auditing with cloud based group user revocation with data integrity

In the current information technology scenario cloud storage is one of the best database platforms which provide the high security to stored data, and also decrease the burden of local data storage and maintenance. Main problem in cloud computing was the problem of data security and data access by unauthorized users. Storage and sharing of data in cloud can be changed simply by user. To overcome this data modification idea by cloud signature is provided to each individual who access data in cloud once the data modified by the user on block the user must ensure that the signature is provided on specific block when user get revoked from accessing cloud the existing user of that cloud must resign data signed by the revoked user to resigned data user must download the entire data and signed it. This difficulty is rectified with novel public auditing mechanism.