基于χ类态的量子保密比较研究

Research on Quantum Private Comparison Based on χ-type State

文章提出了一个基于χ态的量子保密比较协议,参与方Alice和Bob在一个半诚实的第三方的协助下,通过简单的量子测量和数学运算,就可以比较他们的秘密信息是否相等且不泄露秘密信息。所提出的协议不需要消耗昂贵的量子设备进行酉运算。两个参与方和一个半诚实的第三方分别使用单粒子测量和两粒子测量,这些测量用当前技术很容易实现。通过对协议进行安全性分析表明,协议在理论上是安全的,可以有效防止外部窃听以及参与方的截获-测量-重发攻击和第三方攻击。

bThis paper proposes a quantum private comparison protocol based on χ-type state. Two participant parties Alice and Bob, with the help of a semi-honest third party, can compare the equality of their secret information without revealing the content of secret information by simple quantum measurements and mathematical operations. The protocol doesn＇t need unitary operations which may consume expensive quantum devices. Single particle and two particles measurements, which are easy implemented with current technologies, are employed by two participant parties and a semi-honest third party respectively. The security analysis of the protocol shows that the protocol is theoretically safe, which can effectively prevent external eavesdropping, participant＇s intercept–measure–resend attack, and third party＇s attack.