面向公共云存储系统的动态数据公开审计协议研究

云计算通过互联网为用户提供虚拟化服务，避免了因本地资源受限无法满足用户高容量的数据存储和处理需求。然而，现存审计协议在动态操作、存储优化、数据定位方面存在的问题严重阻碍了云计算的推广和应用。针对现存审计协议中存在的不足，本项目首先将盲签名和BLS签名融入审计协议的设计中，并利用矩阵索引结构存储数据，实现多维度数据动态操作；其次，利用收敛加密预处理数据，并根据矩阵存储结构的特点，实现审计数据的细粒度重复检测，提高云服务器存储空间的利用率；再次，利用哈希树（MHT）构建数据索引，通过匹配验证重构的MHT和定位标签，实现云端异常数据的快速定位；最后，拟通过数学验证、仿真模拟和应用验证，对形成的理论、方法和技术进行检验和完善。通过本项目的研究，将在数据审计方面取得原创性理论成果和关键技术突破，推动云计算相关领域和产业发展，为加快“数字中国”建设提供强有力的基础保障。

The technology of cloud computing provides users with a variety of virtualization services via the Internet. The technique of cloud computing avoids the problem of local devices with constrained resources of storage and limited capability that cannot meet the requirements of high-capacity data storage and processing. However, the problems of data dynamics, storage optimization and data location in existing data auditing have definitely obstructed the development and practical application of cloud computing. Aiming at the deficiencies in existing auditing protocols, the project firstly uses the techniques of blind signature and BLS signature in the design of auditing protocol. After that, the matrix index structure will be used to store the data that will realize multi-dimensional dynamics for the audited data. Secondly, the thchnology of convergent encryption will be used to pre-process the data. Mealwhile, the porposed protocol can realize fine-grained duplicate detection for the audited data due to the matrix storage structure of the data stored in cloud servers, which will improve the utilization rate of cloud server storage space. In addition, Merkle-Hash-Tree will be used to construct the storage location index of data blocks. According to the matching verification of the MHT reconstructed by the cloud server and the location tag, the proposed protocol can realize the fast location of corrupted data blocks in the cloud. Finally, the theories, methods and key technologies will be tested and improved according to formal mathematical verification, simulation and application verification. Through the research of this project, we are going to make original theoretical achievements and key technical breakthroughs in data storage auditing, promoting the development of cloud-related fields and industries, and providing a strong guarantee for accelerating the construction of Digital China.