一种含有安全可信任中心的量子秘密共享方案

量子秘密共享（Quantum secret sharing , QSS）可以在不完全信任的通信双方间传递密钥，是量子密码的一个重要分支。本文提出一种含有安全可信任中心的QSS方案。其中，中心能够产生并提供量子态，也能够测量并提取量子态信息。通信用户（Alice、Bob和Charlie）不拥有量子比特产生器和测量器，只需通过幺正操作和交换操作实现密钥传输和窃听防范；同时，Bob和Charlie必须合作才能获得正确的密钥。理论分析表明该方案可有效地抵御截取重发攻击、纠缠测量攻击和关联提取攻击等常见攻击策略；由于方案减少了量子比特产生器和测量器的数量，降低了量子通信的费用。这将为量子秘密共享实用化提供一种可参考的方法。

A Novel Quantum Secret Sharing with a Trustful Center

Quantum secret sharing (QSS) is an important branch of quantum cryptography, which can transmit the secret keys between the untrusted users. In this research, a novel QSS scheme with a trustful center is proposed, which the qubit generating devices and the qubit measuring devices are only equipped at the center. The center can provide the users with quantum states and measure quantum states from the users. The users only perform unitary operations and exchange operations to transmit the secret keys and to prevent eavesdropping. Simultaneously, the cooperative operations must be performed between Bob and Charlie to obtain the secret keys. The theoretical analysis shows that the scheme is immune to the conventional attacks in QSS, such as, the intercept-and-resend attack, the entangle-and-measure attack and the correlation-elicitation attack, etc. As the numbers of qubit generating and measuring devices are reduced greatly, the scheme provides a practical way for QSS technique with less cost.