of online storage services, describe motivations for service providers and auditors to adopt these approaches, and list challenges that need to be resolved for such auditing to become a reality. 1

), the following two fundamental requirements have to be met: 1) TPA should be able to efficiently audit the cloud data storage without demanding the local copy of data, and introduce no additional on-line burden to the cloud user; 2) The third party auditing process should bring in no new vulnerabilities towards

, and introduce no additional online burden to user. In this paper, we propose a secure cloud storage system supporting privacy-preserving public auditing. We further extend our result to enable the TPA to perform audits for multiple users simultaneously and efficiently. Extensive security and performance

With data storage and sharing services provided by the cloud, people can easily work together as a group by sharing data with each other. The Cloud provide platform where all users not only store their data but also used the software and services provided by Cloud Service Provider (CSP). In cloud

burden of user we have public audit ability for cloud data storage. For that we use external audit party to check integrity of outsource data. We introduce third party auditor (TPA) for audit outsourced data without demanding local copy of user. No additional online burden for the cloud user and that can

Cloud servers is a platform for enabling convenient, on demand network access to a shared pool of configurable server resources (memory, networks, storage, cpu, applications, and services) that can be rapidly provisioned and released with minimal management effort or cloud service provider

and index table is used to construct the Audit service. These techniques are supported provable updates to cloud outsourced data. The third party auditing allow to save time and computation resources with reduced online burden of the user. Probabilistic query and periodic verification for improving

different service and deployment models, and can coexist with other technologies and software design approaches. The security challenges cloud computing presents the burden of local data storage and maintenance. public auditability for cloud data storage security is of critical importance so that users can

, and introduce no additional online burden to user. In this paper, we propose a secure cloud storage system supporting privacy-preserving public auditing. We further extend our result to enable the TPA to perform audits for multiple users simultaneously and efficiently.

, and introduce no additional online burden to user. In this paper, we propose a secure cloud storage system supporting privacy-preserving public auditing. We further extend our result to enable the TPA to perform audits for multiple users simultaneously and efficiently. Extensive security and performance