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.
@article{arxiv.2012.11874,
title = {Comment on 'Semi-Quantum Private Comparison Based on Bell States'},
author = {You-Lin Chen and Yu-Chin Lu and Zhong-Xuan Lin and Tzonelih Hwang},
journal= {arXiv preprint arXiv:2012.11874},
year = {2020}
}