Abstract: Sensitive Information Retrieval(SIR) is a hotspot in research of secure multi-party computation. But the existing methods of SIR method can not protect user’s information very well during query. This paper introduces the oblivious third party, indistinguishable concept and the assumption of combination commutative encryption in semi-honest model. A SIR method based on sharing of least information is proposed, which can apply to documentary data retrieval efficiently. Analysis and proof on security and correctness of the method are presented.

Key words: secure multi-party computation, Sensitive Information Retrieval(SIR), privacy protection, cryptology

摘要： 敏感信息检索是安全多方计算研究的热点，而现有的敏感信息检索方法不能有效地保护用户的查询信息。针对上述问题，通过引入茫然第三方，在半诚实模型下基于不可区分概念以及交换加密的安全性假设，给出极少信息共享的敏感信息检索方法，分析和证明了方案的正确性和安全性。

关键词: 安全多方计算, 敏感信息检索, 隐私保护, 密码学

CLC Number: 

• TP309