具有向后无关性的群签名位置隐私保护方案

Location Privacy Protection Scheme for Group Signature with Backward Unlinkability

用户的位置隐私往往包含敏感数据信息,现有的一些位置隐私保护方案由于未能充分考虑匿名数据的可靠性和群内成员撤销时的向后无关性,而不能很好地保护用户的位置隐私。针对上述问题,文章提出具有向后无关性的群签名位置隐私保护方案。该方案以请求用户和协同用户的请求/应答来构造匿名集,避免因匿名服务器被攻破而导致请求用户的隐私泄露;以请求用户的注册时间来生成签名私钥串,使得该方案支持向后无关地撤销异常用户。安全性分析和性能分析表明,文章方案有较高的安全性和较低的计算成本。

User’s location privacy often contains sensitive data information.For some existing location privacy protection schemes,because they do not fully consider the reliability of anonymous data and the backward unlinkability of revocation of group members,they cannot protect user’s location privacy very well.Therefore,a group signature location privacy protection scheme with backward irrelevance is proposed.The scheme constructed an anonymous set by requesting and responding to requests from users and collaborating users,which avoided the privacy disclosure of requesting users due to the cracking of anonymous servers.The signature private key string was generated by requesting the user’s registration time,enabling the scheme to support backward unrelated revocation of the anomalous user.The security analysis and performance analysis show that the scheme has higher security and lower calculation cost.