Recently, Ye et al. (Int. J. Theor. Phys. 56, 1517–1529, 2017) proposed a quantum private comparison (QPC) protocol based on five-qubit entanglement state. Two parties can verify that their secret information is equal or not with the help of the semi-honest third party (TP). However, in this paper we will point out the Ye et al.’s initial protocol is not safe under a special participant attack. That is a malicious participant can get the other party’s secret input information illegally under the forgery attack. Furthermore, we give two possible improvement protocols, which can perform this protocol secure against this kind of attack.
相似文献Based on EPR pairs, Zhang et al. analyzed the security of Yang and Tseng et al’s two QPC protocols, and proposed some new improvement strategies (Zhang and Zhang, Quantum Inform. Process. 12(5):1981–1990 2013). This paper points that Zhang et al’s protocol is insecure under a special attack, i.e. Trojan-horse attacks. To avoid this attack, we present an improved QPC protocol based on single particle encryption. Through security analysis of presented protocol, the improved protocol can resist Trojan horse attack (THA). We give a suggestion that non-orthogonal quantum states can be used to transmit information for reducing the leakage in a QPC protocol.
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