Comment on 'Semi-Quantum Private Comparison Based on Bell States'

TL;DR

This paper critiques a semi-quantum private comparison protocol based on Bell states, highlighting vulnerabilities to specific attacks and proposing an improved, more secure protocol.

Contribution

It identifies security flaws in existing semi-quantum private comparison protocols and introduces an enhanced protocol resistant to double C-NOT and malicious agent attacks.

Findings

Original protocol vulnerable to double C-NOT attack

Proposed protocol resists both identified attacks

Enhanced security improves privacy guarantees

Abstract

This study points out a semi-quantum protocol for private comparison using Bell states (SQPC) suffering from the double C-NOT attack and the malicious agent attack. The attacker can easily obtain information through these attacks. An improved protocol is proposed, which can effectively resist both of these attacks.