Line encryption method based on national cryptographic algorithm

The invention discloses a line encryption method based on a national cryptographic algorithm, the scheme ingeniously introduces the national cryptographic algorithm for line encryption, because the national cryptographic algorithm is safe and small in application range, and is supplemented with algorithms such as DH key negotiation, safe data encryption transmission is realized, and in addition, the security of the line encryption method is greatly improved. The scheme also has the following advantages: 1, the DH key system is reused for negotiating the TK in each communication; 2, regenerating a new SM2 public and private key pair PKA and PUA by the sender in each communication; 3, the line key LineKey is randomly generated in each communication, and is not transmitted on the line; and 4, the communication interaction time is limited, and the cracking possibility is reduced. 本发明公开了一种基于国密算法的线路加密方法，本方案巧妙性引入了国密算法进行线路加密，由于国密算法的安全性以及使用范围较小，再辅以DH密钥协商等算法，实现较为安全的数据加密传输，除此之外，本方案还具有如下优点：1、每次通讯都是重新使用DH密钥体系协商TK；2、每次通讯都由