Lin et al. proposed a mediated semi‐quantum key distribution protocol in 2019. This study shows that Lin et al.'s protocol has a security loophole that could mount to the collective attack to reveal some information about the secret key without being detected. To overcome this problem, an improved protocol is proposed and its security is proven.

中文翻译：

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集体攻击和对“使用单光子的半密钥中间分配”的改进

Lin等。他在2019年提出了一种介导的半量子密钥分发协议。这项研究表明，Lin等人的协议存在一个安全漏洞，该漏洞可能会加到集体攻击中，从而泄露有关秘密密钥的某些信息而不会被发现。为了克服这个问题，提出了一种改进的协议并证明了其安全性。