【摘要】 在传统基于硬件的私有信息检索(HW-PIR)方案中,数据库明文记录容易被泄露。为解决该问题,提出基于加密数据库的HW-PIR方案。将数据库记录转化为(0,1)比特流后进行置换,并采用代理重加密算法,实现对密文数据库的查询,从而保证用户的查询隐私不会泄露给数据库服务器,还能防止用户的查询内容与数据库的隐私泄露给安全协处理器及恶意攻击者。效率分析结果表明,该方案的在线查询复杂度为O(1),同时安全处理器预处理阶段的计算量明显降低。更多还原

【Abstract】 In traditional Hardware-based Private Information Retrieval(HW-PIR) scheme,the plaintext records in database are easy to be revealed.In order to solve the problem,this paper proposes a new HW-PIR scheme based on encrypted database.A permutation after the database records is converted into(0,1) bit stream,which is to inquire the ciphertext database by using the Proxy Re-cryptography(PRC) algorithm,so that the scheme not only can ensure the user’s privacy information not be leaked to the database server,but also can prevent inquires information of users and database privacy being revealed to secure coprocessor and malicious attacks,which is much more secure.Efficiency analysis result shows that the complexity in online inquires stage is O(1),and the computational cost of secure coprocessor in preprocess stage is decreased obviously.更多还原