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在云存储服务中,文件的安全存储和删除是用户最关心的问题之一,已成为云存储研究的重点.针对云存储系统中文件的管理方式和不能彻底删除,可能会导致文件泄露的问题,设计了基于策略的文件加密存储和安全删除机制.该机制引入了数据密钥和控制密钥,通过多级密钥管理有效抵御了共谋攻击.策略用于访问控制密钥,策略撤销时删除相应的控制密钥,从而实现文件的安全删除.理论分析和仿真实验表明,与原有方法相比,该机制增加了云存储环境下文件的安全性,且减小了空间和时间开销.
In the cloud storage service, the safe storage and deletion of files is one of the most concerned issues of users, and has become the focus of cloud storage research.Aiming at the problem that file management may not be completely deleted and the files in the cloud storage system may be leaked , A policy-based file encryption and storage and secure deletion mechanism is designed.This mechanism introduces the data key and control key, which can effectively resist the collusion attack through multi-level key management.The strategy is used to access the control key, when the policy is withdrawn Delete the corresponding control key so as to realize the safe deletion of files.Theoretical analysis and simulation results show that compared with the original method, this mechanism increases the security of the files under the cloud storage environment and reduces the space and time overhead.