Abstract

Abstract — Cloud computing technology providing services rather than a product that permits users to use applications without installation of applications and access their files, application on any personal computer, laptop, tab and mobile devices within the internet or intranet connection. Whereby the software, shared resources and information are provided as a utility network. The Cloud may share data in flexible manner across multiple users. Cloud computing are an internet based sharing service. It has some benefits as avoidance of capital expenditure on personal maintenance, Hardware, software and relief of online burden data storage in a network. Many users can continuously access service from the remote locations. Cloud arises some issues in data security, privacy, integrity, dynamic updates. On the user side every time it is not possible to check their data consistency of stored data on cloud storage. The cloud server stores large amount of data which does not offer guarantees on data integrity and consistency. This problem is solved by a public auditing method, which ensure the integrity and to reduce online burden on cloud data storage. So that user can resort to Third-Party Auditor (TPA) to audit the data by using the ring signatures for data security. The preserving identity privacy of the signer on each block from the TPA means, the group is pre-defined before sharing data is created in the cloud. The membership of each user in the group is not changed during the data sharing stage. The original user is responsible for who is able to share his data before outsourcing data to the cloud. The TPA audits the integrity of shared data across dynamic groups of users in the cloud.