代理动态操作的云数据拥有性证明方案

传统支持动态操作的云存储系统中，对于云中动态文件的动态操作所产生的计算和通信开销是由用户完全承担的，这给用户带来了相应的计算和通信压力。为了解决该问题，构造了云环境下第三方代理动态操作的数据拥有性证明方案，方案中引入了一个功能强大的第三方审计者，用户不仅能委托其承担审计工作而且能够使其代理完成动态操作的任务，在任务处理的过程，系统能够保证用户的数据在第三方审计者中的隐私性。从安全和性能分析可以看出该方案能高效安全地完成审计任务。

Provable Cloud Data Possession Scheme via Third-Party Proxy Dynamic Operations

In the traditional cloud storage system which supports dynamic operations, the computing and communication cost derived from the dynamic operations to the file is undertaken by the user completely. It brings user the corresponding pressure on computation and communication. In order to solve this problem, we design a provable data possession scheme via third-party proxy dynamic operations in clouds. In this scheme we bring in a powerful third-party auditor, the users can delegate it to perform the audit and fulfill the dynamic operations. In this processing, the system can ensure the user's data privacy in the third party auditor. Finally, the security and performance analysis show that our scheme can complete the audit task efficiently and securely.