Tobacco industry workshop-level data transmission method and system based on national secret

The invention discloses a tobacco industry workshop-level data transmission method based on national secret, and the method is characterized in that the method comprises a C/S industrial control terminal data transmission method: employing an OPC server to collect industrial control equipment data; synchronizing the equipment data in the OPC server by using a synchronization module of the Agent; encrypting equipment data by using a national cryptographic algorithm through an encryption module in a cipher machine or an Agent; the encrypted data is transmitted through an SSL (Secure Socket Layer) safety communication link; decryption is carried out after the data arrives at the data user; the invention further discloses a B/S end data transmission method. Aiming at C/S industrial control end data and B/S end management end data in the tobacco data, the tobacco data are encrypted through a national secret algorithm, and different transmission methods are adopted for the data, so that the data confidentiality and