An encryption and decryption communication system and its encryption and decryption method

Abstract

The invention relates to the technical field of network security, and provides an encryption and decryption communication system as well as an encryption method and a decryption method thereof. The encryption method comprises the following steps: 1, judging the identification (ID) code of terminal equipment; 2, synchronizing the terminal equipment with a system clock; 3, exchanging the first bit and the tail bit of each data byte; 4, encrypting software; 5, encrypting hardware; 6, transmitting encrypted data securely. The decryption method comprises the following steps: 1, judging the ID code of the terminal equipment; 2, synchronizing the terminal equipment with the system clock; 3, decrypting the hardware; 4, exchanging each odd-numbered bit of each data byte with a bit before the odd-numbered bit, wherein the odd-numbered bits do not include the first bit and the tail bit of the data byte; 5, decrypting the software; 6, conducting normal data processing on the decrypted data. The encryption method has the advantages that clear text data in a physical layer, a data link layer and a network layer of an industrial bus can be encrypted deeply in the aspects of software and hardware; compared with the pure software encryption method widely adopted at present, the encryption method provided by the invention is more reliable, and the leaking and breaking possibility is greatly reduced.

Description

technical field [0001] The invention relates to an encryption and decryption communication system and an encryption and decryption method thereof, belonging to the technical field of network security. Background technique [0002] In today's industrial network system, the bus is an indispensable and important link, and the data exchanged between multiple devices connected to the bus is often crucial, such as the control system of major national engineering projects and military projects, its information security is listed as The primary task of system design, in order to protect the key parameters of the control system and ensure the normal operation of the equipment from malicious changes and attacks, the data transmitted on the bus must be encrypted and protected. However, in current practical applications, many data transmissions with the help of the bus use a single software encryption method or even no encryption method, which is easy to crack and leak, and a single sof...

AI Technical Summary

Problems solved by technology

However, in current practical applications, many data transmissions by means of the bus use a single software encryption method or even no encryption method, which is easy to crack and leak, and a single software encryption is used to encrypt data with more complex algorithms, but the calculation process is too complicated , will inevitably affect the time of data processing, and then affect the real-time performance of data transmission in the whole system

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