基于云存储的多用户可搜索加密方案

摘要

Cloud storage services allow the users to outsource their data to the cloud storage servers to reduce management costs. The cloud servers cannot be fully trusted while those data may contain sensitive personal information. We study a problem of storing and retrieving private data encrypted in a cloud. Multi-user searchable encryption is a promising way to keep user’s data conifdential against un-trusted cloud service provider and allow users to share their data in privacy. In this paper we propose an efficient, secure and privacy preserving keyword search scheme which supports multiple users with more lfexible key management and lower computation cost rather than known approaches.%云存储服务允许用户外包数据并以此来降低资源开销。针对云服务器不被完全信任的现状，文章研究如何在云环境下对数据进行安全存储和加密搜索。多用户的可搜索加密方案为用户提供了一种保密机制，使用户可以在不受信任的云存储环境下安全地共享信息。在现有的可搜索加密方案的基础上，文章提出了一种安全有效的带关键字搜索的加密方案，以及更加灵活的密钥管理机制，降低了云端数据处理的开销。