基于隐私保护的策略空间叠加模型研究*

研究了基于隐私保护计算模型的现状，提出多个组织在一个互不信任的分布式环境下合作计算时，任何组织无法获取和保护其他组织的隐私信息及位置隐私的问题。引入了隐私保护策略安全级的概念，给出了隐私保护策略的层次框架，论证了基于角色的策略转换和策略空间叠加的可信性，设计了一种隐私保护策略空间的叠加模型。通过开发的LaMOC（location-aware mobile collaborative system）系统的实验结果表明，位置隐私保护算法在此叠加模型下，具有较高的查询精度和有效性。

Study on superposition model based on policy space of privacy preserving

This paper researched the status quo of privacy preserving calculation model, and proposed main problems which no organization could not obtain and secure other organization private information and location privacy when multiple organizations that do no trust each other in a distributed environment cooperation calculations. In order to solve this problem, introduced the security level concept of privacy preserving policy, gave a hierarchical framework of privacy protection strategies, expounded and proved the credibility of policy translation and policy spatial superposition based on role, designed a new spatial superposition model of privacy protection policy. The experimental results show that location privacy protection algorithms in this model have higher accuracy and query through the development of LaMOC system.