中文摘要：

租户数据隐私保护是公共云应用诸多安全问题中最关键的问题之一,对云服务的快速发展有着重大影响.云租户数据有静态数据和动态数据两种形式,现有研究成果大都只针对某一类数据威胁,没有形成实际可用的模型,也没有形成一套完整可行的云租户数据隐私保护方案.对云租户数据的两种存在形式的隐私保护方法进行分类和总结,旨在为后续的云租户数据隐私保护机制研究提供参考.

英文摘要：

The protection of user data＇ s privacy is one of most important security problems in public cloud.The user data in cloud can be categorized into two types： tatic data and dynamic data. Most existing solutions only focus on a single type of the threats to the data. No practical model for this problem exists,nor does a comprehensive and executable solution for protecting the user data＇s privacy in cloud.Considering these two types of user data in cloud,existing work on privacy preserving method is analyzed,and future research directions is discussed.