基于消息认证函数的云端数据完整性检测方案

针对云计算中数据完整性问题，该文提出了一个新的交互式完整性检测方案。该方案通过构造一个I型完善Cartesian消息认证函数及其等效函数，在同步存储数据验证值的前提下，利用等效函数判定云端应答的消息认证值来检测完整性。分析结果表明，该方案在大数分解的困难性假设下能正确检测完整性，并且运行时仅需用户端常量的计算量、存储占用量和网络通信量，相比较现有方案，具有明显效率优势。

Data Integrity Checking Approach Based on Message Authentication Function for Cloud

In order to solve the data integrality issue in the cloud computing, a new interactive integrality checking scheme is proposed. This scheme firstly constructs a perfect cartesian message authentication function type I and its equivalent function, then use synchronous verification value and the equivalent function to determine response message authentication value to detect integrity. Analysis results show that this new scheme can correctly check cloud file,s integrality with the difficulty of factoring large integer and only request constant computation, storage and constant network resource for the users, which is more computationally efficient than others.