CN102354142A - Encryption method for programmable logic controller (PLC) - Google Patents
Encryption method for programmable logic controller (PLC) Download PDFInfo
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- CN102354142A CN102354142A CN201110210475XA CN201110210475A CN102354142A CN 102354142 A CN102354142 A CN 102354142A CN 201110210475X A CN201110210475X A CN 201110210475XA CN 201110210475 A CN201110210475 A CN 201110210475A CN 102354142 A CN102354142 A CN 102354142A
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- user identification
- identification code
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Abstract
The invention discloses an encryption method for a programmable logic controller (PLC). The method comprises the following steps of: issuing matched license certificates containing user identification code information to a PLC production line and a PLC user; exporting user identification codes from the license certificates by using the PLC production line, and writing the user identification codes into an electrically erasable programmable read-only memory (EEPROM) of the PLC; exporting the user identification code information from the license certificate of a user by using background programming software of the PCL during programming of the user; compiling the user identification code information into a PLC target code when the background programming software of the PLC compiles a user program to generate the PLC target code, and storing the PLC target code in a FLASH memory of the PLC; and comparing whether the user identification code of the EEPROM is matched with that of the PCL target code or not during running of the PLC, and if the user identification code of the EEPROM is not matched with that of the PLC target code, stopping running. By the encryption method, the cracking difficulty is increased, and the safety of PLC source programs is ensured.
Description
[technical field]
The present invention relates to programmable controller, relate in particular to a kind of PLC encryption method.
[background technology]
The encryption of existing programmable controller (PLC) is an object code of in FLASH, depositing PLC, and it is in FLASH, to preserve password that PLC is encrypted, if PLC is formatd, then PLC object code and PLC password all can be wiped free of.
The content that the user uses the equipment read FLASH can read FLASH, through PLC is provided with different ciphers, relatively the content of FLASH can be known the deposit position of password, thereby can crack PLC.Cracked the source program that the PLC password just is equivalent to have cracked PLC.Even the user can not crack source program, also " PLC object code " can be copied among the other PLC and normally carry out.
[summary of the invention]
The technical matters that the present invention will solve provides a kind of PLC encryption method that is not easy to be cracked.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopts is that a kind of PLC encryption method may further comprise the steps:
101) issue the supporting ticket credentials that contains user identification code information to PLC production line and PLC user;
102) the PLC production line is derived user identification code from " ticket credentials ", user identification code is write among the EEPROM of PLC;
103) during user program; The backstage programming software of PLC is derived user identification code information from user's ticket credentials; When the backstage programming software compiling user program of PLC generates the PLC object code; User identification code information is compiled in the PLC object code, and the PLC object code is saved in the FLASH storer of PLC;
104) in PLC when operation,, relatively whether the user identification code of EEPROM and the user identification code of PLC object code mate, if do not match then stop running.
When above-described PLC encryption method, the formatted program of PLC format at the EEPROM to PLC, walk around the memory block of user identification code, the user identification code among the EEPROM is not wiped with format.
Above-described PLC encryption method is uploaded the PLC object code from the FLASH storer of PLC, when its decompiling was user program, at first whether the user identification code of verification PLC object code was consistent with user identification code in the decompiling software.If inconsistent, then end decompiling.
The ticket credentials that ticket credentials and the PLC user program of use use is set must be same ticket credentials or its copy to PLC in the PLC encryption method of the present invention, otherwise PLC can not move, and has increased the difficulty that cracks, and has guaranteed the safety of PLC source program.
[description of drawings]
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Fig. 1 is the process flow diagram of PLC encryption method embodiment of the present invention.
[embodiment]
In the embodiment of the invention shown in Figure 1, PLC factory produces supporting " ticket credentials " with " ticket credentials generation software ", and certificate is presented to PLC production line and final user respectively.
PLC is provided with:
The PLC production line uses user identification code to write software and imports user identification code from " ticket credentials ".User identification code is write among the EEPROM of PLC, when the formatted program of PLC formats at the EEPROM to PLC, walk around the memory block of user identification code, the user identification code among the EEPROM is not wiped with format.
User program:
The user at first will obtain the PLC ticket credentials.
The user uses backstage programming software (Xbuilder) to import user identification code information from " ticket credentials ".
When backstage programming software (Xbuilder) compiling user program generates " PLC object code ", user identification code information will be compiled in the PLC object code.This PLC object code can be downloaded among the FLASH that is saved in PLC.
PLC operation (the PLC operation is meant and carries out the PLC object code) before, relatively the user identification code of EEPROM and PLC object code user identification code whether mate, if do not match then do not move:
1, the ticket credentials of ticket credentials of " PLC setting " use and the use of PLC user program must be same ticket credentials or its copy, otherwise PLC can not move.
2, when uploading " PLC object code " from PLC when its decompiling is user program, whether the user identification code of at first verification " PLC object code " is consistent with user identification code in the decompiling software (backstage programming software XBuilder).If inconsistent, then could not decompiling.
Claims (2)
1. a PLC encryption method is characterized in that, may further comprise the steps:
101) issue the supporting ticket credentials that contains user identification code information to PLC production line and PLC user;
102) the PLC production line is derived user identification code from " ticket credentials ", user identification code is write among the EEPROM of PLC;
103) during user program; The backstage programming software of PLC is derived user identification code information from user's ticket credentials; When the backstage programming software compiling user program of PLC generates the PLC object code; User identification code information is compiled in the PLC object code, and the PLC object code is saved in the FLASH storer of PLC;
104) in PLC when operation,, relatively whether the user identification code of EEPROM and the user identification code of PLC object code mate, if do not match then stop running.
2. PLC encryption method according to claim 1 is characterized in that, when the formatted program of PLC formats at the EEPROM to PLC, walks around the memory block of user identification code, and the user identification code among the EEPROM is not wiped with format.
PLC encryption method according to claim 1; It is characterized in that; From the FLASH storer of PLC, upload the PLC object code; When its decompiling is user program; At first whether the user identification code of verification PLC object code is consistent with user identification code in the decompiling software; If inconsistent, then end decompiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210475XA CN102354142A (en) | 2011-07-26 | 2011-07-26 | Encryption method for programmable logic controller (PLC) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210475XA CN102354142A (en) | 2011-07-26 | 2011-07-26 | Encryption method for programmable logic controller (PLC) |
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| CN102354142A true CN102354142A (en) | 2012-02-15 |
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| CN201110210475XA Pending CN102354142A (en) | 2011-07-26 | 2011-07-26 | Encryption method for programmable logic controller (PLC) |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013239036A (en) * | 2012-05-15 | 2013-11-28 | Fuji Electric Co Ltd | Control system, control device and program execution method |
| CN103544451A (en) * | 2013-10-29 | 2014-01-29 | 威海麦科电气技术有限公司 | Programmable logic controller (PLC) encryption method and system based on step-by-step maintaining |
| CN104597833A (en) * | 2015-01-14 | 2015-05-06 | 上海海得控制系统股份有限公司 | PLC protection system and method |
| CN104819097A (en) * | 2015-04-03 | 2015-08-05 | 北京天诚同创电气有限公司 | Protection method and device for programmable controller program of wind generating set |
| CN107844695A (en) * | 2017-10-16 | 2018-03-27 | 深圳市合信自动化技术有限公司 | A kind of PLC engineering softwares protection device and its guard method |
| CN113343215A (en) * | 2021-07-20 | 2021-09-03 | 厦门锐骐物联技术股份有限公司 | Embedded software authorization and authentication method and electronic equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013239036A (en) * | 2012-05-15 | 2013-11-28 | Fuji Electric Co Ltd | Control system, control device and program execution method |
| CN103544451A (en) * | 2013-10-29 | 2014-01-29 | 威海麦科电气技术有限公司 | Programmable logic controller (PLC) encryption method and system based on step-by-step maintaining |
| CN104597833A (en) * | 2015-01-14 | 2015-05-06 | 上海海得控制系统股份有限公司 | PLC protection system and method |
| CN104597833B (en) * | 2015-01-14 | 2017-03-22 | 上海海得控制系统股份有限公司 | PLC protection system and method |
| CN104819097A (en) * | 2015-04-03 | 2015-08-05 | 北京天诚同创电气有限公司 | Protection method and device for programmable controller program of wind generating set |
| CN107844695A (en) * | 2017-10-16 | 2018-03-27 | 深圳市合信自动化技术有限公司 | A kind of PLC engineering softwares protection device and its guard method |
| CN113343215A (en) * | 2021-07-20 | 2021-09-03 | 厦门锐骐物联技术股份有限公司 | Embedded software authorization and authentication method and electronic equipment |
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Application publication date: 20120215 |