带陷阱的B 92量子密钥分配协议

B92 Quantum Key Distribution Protocol with Trap

把量子力学应用到密码学中产生了一个新的学科——量子密码学。量子密码提供的密钥交换方式,能够自动检查是否有人在窃听,这是公钥体制所不具备的。对有噪声的B 92协议作了一些改进,这种改进的核心思想是在考虑提高传输效率的基础上,发信方故意公布假的测量基,以诱使窃听者现身。考虑到实际应用情况,此方案采用的是在实用中保证安全性的前提下,发送方和接受方通过第三方普通信道协商好量子接收的规则,从而大大提高了传输的效率。这种改进方案对其他带有噪声的量子密码协议同样适用。

Application of quantum mechanics to cryptography has brought a new subject-quantum cryptography. The quantum cryptographic system is different from public key system in exchanging secret key. It can automatically detect eavesdropping while public key system can not. In this paper, an improved B92 quantum key distribution protocol is proposed. Its main idea is to find secret listener-in from trap and improve the transmitting efficiency. It is also fitful for other quantum cryptographic protocols.