Password changing type encryption method of numerical control system access rights
A technology of numerical control system and encryption method, applied in the direction of user identity/authority verification, etc., can solve problems such as low security, technology leakage, misoperation, etc., and achieve reliable protection and remarkable effects
Inactive Publication Date: 2012-07-18
JIER MACHINE TOOL GROUP
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Problems solved by technology
Because it uses a fixed password, the security of this protection mechanism is low, and it cannot effectively prevent unauthorized personnel from accessing important data of the system; once the parameters, variables or initialization files in the machine tool system are changed, it may lead to technology leakage Or lead to misoperation, resulting in irreparable losses
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[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0016] like figure 1 and figure 2 Provide the principle diagram and program flow chart of the change cipher type encryption side of the present invention, which includes the following steps:
[0017] a. System power-on judgment, judge whether the CNC system is powered on again; if it is not powered on again, perform step b; if the system is powered on again, perform step d;
[0018] b. Judging the validity period of the password, judging whether the existing password is within the validity period; if not within the validity period, perform step d; if within the validity period, perform step c;
[0019] c. Keep the existing password unchanged;
[0020] d. Generate password seeds, generate three positive integer random variables a, b, and c, each random variable is used as a password seed for generating passwords; the formula for generating random var...
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The invention relates to a password changing type encryption method of numerical control system access rights, which is characterized by including: a. judging the powering up state; if numerical control system is not powered up again, b is performed; otherwise, d is performed; b. judging period of validity, if existing passwords are in the period of validity, d is performed; otherwise, c is performed; c. maintaining the existing passwords unchanged; d. generating password seeds, the number of the seeds is positive integer and >=2; e. calculating the function value based on the password seeds, and the function value is a current password; f. judging whether a password input by users is correct. According to the encryption method, new password seeds are generated by powering up again on the numerical control system or after the end of the password validity period, and the formula for calculating passwords based on the password seeds are grasped by relevant authorized officers, accordingly, even though a password is carelessly leaked to non-authorized officers, the password can be used only once, reliable protection for important data of the numerical control system is achieved to the largest extent.
Description
technical field [0001] The present invention relates to a change cipher type encryption method of the access right of a numerical control system, more specifically, to a change cipher type encryption method of a numerical control system access right which generates a random password according to a generated random number. Background technique [0002] As an effective protection method for CNC equipment, password protection protects CNC equipment from unauthorized operations. For example, SIEMENS CNC system has a level 3 password access authority, which involves the reading and writing of important data such as machine parameters, global variables, and initialization files. Protect. Because it uses a fixed password, the security of this protection mechanism is low, and it cannot effectively prevent unauthorized personnel from accessing important data of the system; once the parameters, variables or initialization files in the machine tool system are changed, it may lead to te...
Claims
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IPC IPC(8): H04L9/32
Inventor 周辉刘翔云刘洪亮盛超丰
Owner JIER MACHINE TOOL GROUP