密钥分配实现混合通信，对称密钥实现通信，公钥加密私钥传送。发方加密明文发给收方，并用收方的公钥加密私钥发送给收方，收方用自己的私钥解密得到发方的私钥，然后解密密文，得到明文消息。-The Key Distribution achieve mixed communication, communication, public key encryption private key transmission symmetric key. The sender to encrypt the plainte