Serial port encryption communication method

The invention discloses an encryption communication method of a serial port. A client and a server perform bidirectional identity authentication by using a message in a private protocol data encapsulation format and ukey; and according to actual service requirements, when data transmission is carried out between the client and the server, plaintext data transmission is carried out by using the message in the private protocol data encapsulation format, or ciphertext data transmission is carried out by using the message in the private protocol data encapsulation format and the ukey. And when the data transmission between the client and the server is stopped, the client verifies the communication link by using the message in the private protocol data packaging format. According to the encryption communication method of the serial port, the information tampering cost is increased, the identity of an operator can be accurately confirmed in real time, non-specified client connection is forbidden, data can be accura