1、实现集中式对称密钥的分配工作（作为通讯的双方A和B，都已经分别和KDC拥有会话密钥）；

2、分布式对称密钥分配（作为通讯的双方A和B已经共享一个会话主密钥）；

3、公钥密码技术实现对称密码技术密钥的分配（作为通讯的双方A和B已经拥有对方的公钥）；-1, the realization of a centralized allocation of symmetric key (for communication between the parties A and B, respectively, and the KDC already has a session key)　2, Distributed symmetric key distribution (as communications between the parties A and B have to share a session master key)　3, public key cryptographic techniques to achieve symmetric cryptography key distribution (for communication between the parties A and B have each other' s public key) 相关搜索： Cryptography
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