多服务器环境下的隐私信息检索

Private Information Retrieval under Multi-server Environment

隐私信息检索(PIR)是为了保障个人隐私在公共网络平台上的私密性而采用的一种阻止数据库知晓用户查询信息的策略。通过研究已经被提出的PIR方案,分析其优缺点,试图探求一种能够综合考虑多方面安全性的可行PIR方案模型。文章采用Shamir秘密共享协议、乘法同态加密和其他相关的技术,结合当前网络环境的复杂性,并考虑可能存在的对用户检索信息的恶意攻击,设计了一种基于多服务器的隐私信息检索方案。

Private information retrieval（PIR） is a strategy to protect individual privacy on the puhlic network platform and prevent database from knowing user＇s query information. The formerly proposed PIR schemes and their merits and demerits are studied and analyzed, and a feasible PIR model in considering various safeties is explored. With these, Shamir secret-sharing protocol, multiplication homomorphism encryption and other technologies are employed, and a proper PIR scheme based on multiple servers is designed in consideration of the current complicated network environment and hostile attack to user＇s query information.