自从Shannon奠定了现代保密通信的理论基础以来,随着通信技术的飞速发展,特别是在当今的信息爆炸时代,保密通信也在不断地完善和发展。保密通信已不再为军事和外交领域所专有,它已深入到了国民经济的各个领域。各种类型的保密通信设备及相应的密钥管理设备层出不穷,愈来愈先进。通信网络和保密设备、密钥自动分发管理设备以及保密协议 Since Shannon laid the theoretical foundation of modern secure communication, with the rapid development of communication technology, especially in the era of information explosion, secure communication is constantly being perfected and developed. Confidentiality communication is no longer exclusively in the military and diplomatic fields. It has gone deep into all areas of the national economy. Various types of secure communications equipment and the corresponding key management equipment after another, more and more advanced. Communications networks and security devices, automated key distribution management devices, and privacy protocols