Dynamic password protection system and method based on plc

Abstract

The invention provides a dynamic password protection system and method based on PLC. The dynamic password protection system based on PLC comprises an encryption module and a decryption module, wherein the encryption module comprises: a key code encryption sub-module; a code replacing and adding sub-module; and a matrix change encryption sub-module, the input information is a dynamic code, a serial number and an allowable use time, the three parts are changed into a bit data by processing, the a bit data form a matrix with 3 rows and a columns to serve as input, the matrix with 3 rows and a columns, namely 3a bit data in total are output as an encryption result, and the decryption module reversely runs relative to an encryption process and decrypts the encrypted data. According to the dynamic password protection system and method based on PLC provided by the invention, as the dynamic password is encrypted and decrypted, a user can be notified about the password, the user performs unlock by himself, and every password is different, so there is no need to worry about the leakage of the password and the repeated use of the password by the user.

Description

Technical field [0001] The invention relates to a PLC-based dynamic password protection system. The invention also relates to a PLC-based dynamic password protection method, which belongs to the field of password generation and protection. Background technique [0002] In the field of industrial control, after years of industry accumulation, equipment manufacturers often have some of their own unique functions reflected in the equipment. In order to protect their intellectual property rights, equipment manufacturers may restrict the use of certain functions or adopt a charging model. Unlock these functions by password. The disadvantage of the existing password unlocking method is that the password is a fixed password, which is easy to be recorded by others and cause the password to be leaked. If a password is adopted for each device, it will inevitably result in the need to modify the program for each device and increase the service volume of software engineers. In addition, u...

AI Technical Summary

Problems solved by technology

The disadvantage of the existing password unlocking method is that the password is a fixed password, which is easy to be recorded by others and cause password leakage

If one password is used for each device, it will inevitably cause the need to modify the program for each device, increasing the service volume of software engineers

In addition, unlocking the function by the manufacturer in the field will increase the service volume of the device manufacturer

The existing method can only pre-set the allowable use time in the program in advance, and it is difficult to flexibly control the allowable use time of the unlock function

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