【摘要】 基于密文的数据库可以有效实现数据库安全。文献[1,2]提出一种索引机制,但安全性和任务分配存在问题。文献[3,4]提出用一种秘密同态的技术解决此问题。但如何实际实现未提及。提出了基于秘密同态的实现模型,同时对秘密同态的数学基础进行了研究,并证明了在实数范围内以目前运算的基础是不可行的,必须在拓扑空间或环上定义一种新的运算。更多还原

【Abstract】 Encrypted database are an effective method to realize database security.A quick index is raised in paper [1,2].But there is deficiency about security and task allocation.Privacy homomorphism is raised to discuss this problem in paper [3,4].A module based on privacy homomorphism is presented,and mathematic method on privacy homomorphism is discussed.It is proved that this method is impossible in the range of the real,and a new operation must be defined.更多还原