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1 问题的提出传统的保密通信要求通信双方都持有一个必须保守绝对秘密的密钥,而双方的密钥必须由同一个密钥源产生。密钥送到通信当事人手中的方法,一般是保密通信的一方或双方自己去取或者找非常信得过的人送去。这种状况虽说已要为取或送密钥而走不少路程,但当保密通信仅是点对点的通信,而秘密地传送少量密钥数据就能保障大量消息进行安全保密的通信时,这种状况是可以被使用方接受的。不过当需要进行网状的保密通信时,这个密钥分配(传送)问题就成了个大问题。如果一个通信网地域上遍布全国,那么分配(或更换)一次密钥,就要同时派出许多可靠的人到各地去更换。如果网是
1 PROBLEM PROBLEM Conventional secure communication requires that both parties to the communication have a key that must be kept absolutely secret, and the keys of both must be generated by the same key source. The key is sent to the parties to the communication method, the confidential communication is usually one or both of the parties to take or find a very trustworthy person sent. Although this situation has to go a long way in order to pick up or send keys, when confidential communications are only point-to-point communications, and the secret to send a small amount of key data to protect a large number of messages for secure communications, this The condition is acceptable to the consumer. However, when the need for mesh-based secure communications, the key distribution (transfer) problem has become a big problem. If a communications network is distributed all over the country, then assigning (or replacing) a key requires sending many reliable people to go all over the country at the same time. If the net is