改进的保护身份的云共享数据完整性公开审计方案

Improved Auditing Schemes with Identity-preserving for the Integrity of Shared Data in the Cloud

随着网络与信息技术的发展,云计算成了当今最热门的话题之一,云服务逐渐走进人们的生活,云服务商可以向数据用户提供数据存储和计算等服务。但是,在这种服务中必须有一个代表数据用户利益的第三方审计员定期验证用户外包数据的完整性。而且,在外包和审计过程中必须保护数据用户的身份和数据文件内容的安全。文章针对云共享数据完整性检测问题,利用数字签名技术和双线性对的性质,对两个保护用户身份的云共享数据完整性公开审计方案进行了改进,并在计算离散对数困难性问题假设下,对一个改进方案的安全性进行了证明。通过计算量和安全性比较,文章提出的改进方案有更严谨的安全性和相对小的计算成本。

With the development of Internet and information technology, cloud computing has become one of the hottest topic of the day, cloud service is getting into people＇s life day by day, and provides data storage and computing service to data users. But, it is necessary for an auditor on users＇ behalf to check the integrity of the outsourced data in the cloud. Also the cloud server must ensure the identities of the users and privacy of the data blocks. In this paper, based on the existing work, we use digital signature technology and the properties of the bilinear pairing and propose improved public auditing schemes with identity-preserving for the integrity checking of the shared data in the cloud and prove the security of one improved scheme under the assumption that the discrete logarithm problem is hard. Through comparison of computation and security, it is shown that the improved scheme proposed in this paper has more rigorous security and relatively smaller computation cost.