QKD网络中组密钥协商的研究

摘要

Traditional group key agreement methods are hard to meet the practical needs of QKD networks.In view of this, we propose a group key agreement scheme with composite quantum group which is applicable to a variety of QKD networks structures.The scheme classifies QKD networks with different structures to a unified form, and makes full use of the keys in key buffer pool, accomplishes the security negotiation process on the classical channel.Eventually, all the QKD devices participated in the multicast communication can obtain same group keys, and distribute these group keys to users.Compared with several traditional group key agreement schemes, our scheme has good security and scalability, and has high efficiency in most application environments as well.%传统组密钥协商方法很难满足QKD(Quantum Key Distribution)网络的实用需求. 针对这种情况,提出一种适用于多种QKD网络结构的复合式量子组密钥协商方案. 该方案将不同结构的QKD网络归为统一的形式,充分利用密钥缓存池中的密钥,在经典信道上完成安全协商过程,最终参与组播通信的QKD设备都能获得一致的组密钥,并将这些密钥分发给用户. 与几种传统组密钥协商方案对比,该方案具有很好的安全性和可扩展性,并在绝大数应用环境下具有很高的效率.