Method for combining encryption to lower computer based on schoolyard card entrance guard system

Abstract

The invention discloses a combined encryption method based on a lower computer of a campus card door-access system. The method is the combined encryption method that makes use of an upper computer of the campus card door-access system to encrypt the lower computer so as to realize that even though a circuit board and program of the lower computer are decoded by a stranger, the lower computer still cannot work normally. The method includes the steps: 1. the lower computer of the door-access system is charged to work by the first time; the upper computer dose not sent the encryption information and the lower computer detect whether the encryption information is contained in the FLASH used for storing the personnel information and door-opening records of personnel using cards, and if without the encryption information, the FLASH is fully formatted to lead the information of the FLASH to be lost completely so as not to lead the lower computer to work normally; 2. after charged, the upper computer sends a list of personnel which are allowed to open the door to the FLSAH of the lower computer, and the sent information contains the combined encryption information which is sent each time when the list of personnel allowed to open the door is sent; 3. once the encryption information in the FLASH is detected to be right by the lower computer, the lower computer works normally; if not, the lower computer cannot work as usual.

Description

Technical field: [0001] The invention relates to a method for joint encryption in the field of access control security systems, in particular to a method for using an upper computer to perform joint encryption on a lower computer based on a campus card access control system. Background technique: [0002] With the development of electronic technology, the cracking technology of the program in the electronic chip has also been greatly improved. In this way, there is a great threat to the intellectual property rights of the program written in the chip. At present, in the access control system, the system's lower computer (access controller) generally adopts a double-layer PCB board and an architecture based on 80C51 core chips on the circuit. In terms of circuit design, the double-layer circuit board is extremely easy to be copied by others. In terms of the computer program, the program in the CPU is also easy to be cracked by others to obtain the HEX file of the program. In this ...

AI Technical Summary

Problems solved by technology

In this way, the circuits and programs originally designed by one's own wisdom and technology are stolen by others, and the designed products are easily copied by others, which greatly endangers the original creator's intellectual property rights and design enthusiasm.

Images