CN102735985B - The anti-sniffer of random current type and anti-detection method - Google Patents
The anti-sniffer of random current type and anti-detection method Download PDFInfo
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- CN102735985B CN102735985B CN201210192323.6A CN201210192323A CN102735985B CN 102735985 B CN102735985 B CN 102735985B CN 201210192323 A CN201210192323 A CN 201210192323A CN 102735985 B CN102735985 B CN 102735985B
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Abstract
The present invention relates to the anti-sniffer of a kind of random current type, it is characterized in that comprising: current source, voltage detection module, randomizer, current source control module, time setting module, detection judge module and resistance, described randomizer is connected respectively current source control module and surveys judge module with time setting module, current source control module connects current source, survey judge module and connect voltage detection module, current source and voltage detection module are by arriving power supply or power supply ground again after connecting line contact resistance. The anti-sniffer of random current type and the anti-detection method of the high safety based on information security chip or information security terminal use provided by the present invention, can be by the different electric currents output of random generation, be applied to metal grill or touch switch, can prevent from attacking by physical methods such as dismounting, boring, laser, effectively protect chip internal information or end product internal information.
Description
Technical field
The present invention relates to information security field, particularly a kind of anti-sniffer and anti-detection method based on information security chip and information security terminal.
Background technology
The anti-detection method of current mode based on information security chip and information security terminal is mainly employing time setting means at present, and electric current output is fixing. There is the possibility being broken in this type of detection method, under time setting value and current output value are acquired, this detection method is just broken.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, a kind of anti-sniffer of random current type and anti-detection method of the high safety based on information security chip or information security terminal use are provided, can be by the different electric currents output of random generation, be applied to metal grill or touch switch, can prevent from attacking by physical methods such as dismounting, boring, laser, effectively protect chip internal information or end product internal information.
The present invention is achieved in that the anti-sniffer of a kind of random current type, it is characterized in that comprising: current source, voltage detection module, randomizer, current source control module, time setting module, detection judge module and resistance, described randomizer is connected respectively current source control module and surveys judge module with time setting module, current source control module connects current source, survey judge module and connect voltage detection module, current source and voltage detection module are by arriving power supply or power supply ground again after connecting line contact resistance.
Described current source can adopt imported current source or employing output type current source.
The anti-sniffer of described random current type can adopt two groups, adopts respectively imported current source and adopts output type current source composition mutual exclusion combination.
The anti-detection method of a kind of random current type, comprises following steps:
A. the fixing random number numerical value that randomizer produces, inputs to current source control module simultaneously and surveys judge module;
B. current source control module, according to above-mentioned random number numerical value, is set the output of current source or inputs different electric currents, surveys judge module according to above-mentioned random number numerical value, sets relevant voltage;
C. current source arrives resistance according to setting current values by connecting line, then arrives power supply or arrive power supply ground, and the connecting line of contact resistance will produce relevant voltage;
D. in the time meeting with outside detection, replacing, series winding the Lian Douhui that can cause producing this resistance causes voltage change occurs in the time that fixed current is inputted, survey judge module and just can obtain the difference of the super scope that detects voltage and setting voltage by voltage detection module, thereby triggered system alarm signal;
When connecting line is disconnected, can cause equally the difference of the super scope that detects voltage and setting voltage, also can trigger system alarm signal, reach the object of anti-detection.
The above-mentioned anti-detection method of random current type, can further be specially:
By adopting the anti-sniffer of random current type of output type current source and the anti-sniffer of random current type of the imported current source of employing, form mutual exclusion combination between the two;
Set inflow or flow out electric current at imported current source or output type current source respectively simultaneously, detecting voltage by voltage detection module simultaneously;
If connection short-circuit between conductors, also can cause and the difference of the super scope that detects voltage and setting voltage can trigger equally system alarm signal, reach the object of anti-detection.
The anti-sniffer of random current type and anti-detection method that the present invention adopts, because being exports by the random different electric currents that produce of randomizer, be applied to metal grill or touch switch, can prevent from attacking by physical methods such as dismounting, boring, laser, effectively protection chip internal information or end product internal information, can greatly improve the safety of information security kind equipment or E-Payment kind equipment, avoid the leakage of sensitive data.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of the anti-sniffer of random current type of employing output type current source of the present invention.
Fig. 2 is the schematic diagram of the anti-sniffer of random current type of the imported current source of employing of the present invention.
Fig. 3 is the imported current source of employing of the present invention and the schematic diagram that adopts the anti-sniffer of output type current source composition mutual exclusion combining random current mode.
Detailed description of the invention
Embodiment mono-:
Refer to Fig. 1, it is the schematic diagram of a kind of anti-sniffer of random current type that adopts output type current source of the present invention, current source, voltage detection module, randomizer, current source control module, time setting module, detection judge module and resistance, described randomizer is connected respectively current source control module and surveys judge module with time setting module, current source control module connects current source, survey judge module and connect voltage detection module, current source and voltage detection module arrive power supply ground again by connecting line contact resistance.
Wherein the effect of each part is as follows: current source, for exporting or input different currents; Voltage detection module, in the time that triggering signal is inputted, detects its voltage; Randomizer, produces not isotopic number random number for introducing ambient parameter; Current source control module according to input numerical value, is exported or is inputted the size of current of this module, and can maintain a period of time in the time that triggering signal is inputted; Time setting module, can set different time numerical value as required, is allowed to condition at generation triggering signal in the stipulated time; Survey judge module, in the time that triggering signal is inputted, voltage and setting voltage comparison detected, if the higher certain numerical value of voltage detected or reduce certain numerical value, all can triggering system alarm signal export; Resistance: be the fixed value resistance in chip exterior link, because replacing, series winding the Lian Douhui of this resistance cause, voltage change occur in the time that fixed current is inputted.
Its operation principle is as follows:
First the fixing random number numerical value producing by randomizer, inputs to current source control module simultaneously and surveys judge module; Current source control module, according to above-mentioned random number numerical value, is set the output of current source or inputs different electric currents, surveys judge module according to above-mentioned random number numerical value, sets relevant voltage; Current source arrives resistance according to setting current values by connecting line, then to power supply ground, the connecting line of contact resistance will produce relevant voltage; In the time meeting with outside detection, replacing, series winding the Lian Douhui that can cause producing this resistance causes voltage change occurs in the time that fixed current is inputted, survey judge module and just can obtain the difference of the super scope that detects voltage and setting voltage by voltage detection module, thereby triggered system alarm signal; Meanwhile, when connecting line is disconnected, can cause equally the difference of the super scope that detects voltage and setting voltage, also can trigger system alarm signal, reach the object of anti-detection.
Embodiment bis-:
As Fig. 2, it is the schematic diagram of a kind of anti-sniffer of random current type that adopts imported current source of the present invention, output type current source in embodiment mono-is replaced to imported current source, can realize equally the goal of the invention of above-mentioned anti-detection, its operation principle is also similar to embodiment mono-, does not repeat them here.
Embodiment tri-:
As Fig. 3, the imported current source of employing of the present invention and the schematic diagram that adopts the anti-sniffer of output type current source composition mutual exclusion combining random current mode, comprise one group of anti-sniffer of random current type that adopts the anti-sniffer of random current type of output type current source and adopt imported current source, form mutual exclusion combination between the two, can, simultaneously respectively adopting imported current source or employing output type current source to set inflow or flowing out electric current, adopt imported current source or employing output type current source detection voltage simultaneously; If connect in addition short-circuit between conductors, also can cause the difference of the super scope that detects voltage and setting voltage, can trigger equally system alarm signal, like this except above-mentioned replacing, series winding and connect etc. situation, also can be used for surveying the situation that it connects short-circuit between conductors, can reach better anti-Effect on Detecting.
Claims (3)
1. the anti-sniffer of random current type, it is characterized in that comprising: current source, voltage detection module, randomizer, current source control module, time setting module, detection judge module and resistance, described randomizer is connected respectively current source control module and surveys judge module with time setting module, current source control module connects current source, survey judge module and connect voltage detection module, current source and voltage detection module are by arriving power supply or power supply ground again after connecting line contact resistance; The anti-sniffer of described random current type adopts two groups, adopts respectively the anti-sniffer of random current type of imported current source and adopts the anti-sniffer composition of the random current type mutual exclusion of output type current source to combine.
2. the anti-detection method of random current type, is characterized in that comprising following steps:
A. the fixing random number numerical value that randomizer produces, inputs to current source control module simultaneously and surveys judge module;
B. current source control module, according to above-mentioned random number numerical value, is set current source output or inputs different electric currents, surveys judge module according to above-mentioned random number numerical value, sets relevant voltage;
C. current source arrives resistance according to setting current values by connecting line, then arrives power supply or arrive power supply ground, and the connecting line of contact resistance will produce relevant voltage;
D. in the time meeting with outside detection, can cause producing this resistance replacing, series winding or and connect, the replacing of this resistance, series winding or and Lian Douhui cause voltage change occur in the time that fixed current is inputted, survey judge module and just can obtain the difference of the super scope that detects voltage and setting voltage by voltage detection module, thereby triggered system alarm signal; When connecting line is disconnected, can cause equally the difference of the super scope that detects voltage and setting voltage, also can trigger system alarm signal, reach the object of anti-detection.
3. the anti-detection method of random current type according to claim 2, is characterized in that: be further specially:
E. will adopt the anti-sniffer of random current type of output type current source and adopt the anti-sniffer composition of the random current type mutual exclusion of imported current source to combine; Wherein, the anti-sniffer of described random current type, comprise: current source, voltage detection module, randomizer, current source control module, time setting module, detection judge module and resistance, described randomizer is connected respectively current source control module and surveys judge module with time setting module, current source control module connects current source, survey judge module and connect voltage detection module, current source and voltage detection module are by arriving power supply or power supply ground again after connecting line contact resistance;
F. set inflow and flow out electric current at imported current source and output type current source respectively simultaneously, the voltage detection module that adopts the anti-sniffer of random current type of output type current source and adopt the anti-sniffer of random current type of imported current source to pass through separately simultaneously detects voltage;
If g. connect short-circuit between conductors, also can cause and adopt the anti-sniffer of random current type of output type current source or adopt detection voltage that the anti-sniffer of random current type of imported current source obtains by voltage detection module separately and the difference of the super scope of setting voltage, can trigger equally system alarm signal, reach the object of anti-detection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210192323.6A CN102735985B (en) | 2012-06-12 | 2012-06-12 | The anti-sniffer of random current type and anti-detection method |
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| CN201210192323.6A CN102735985B (en) | 2012-06-12 | 2012-06-12 | The anti-sniffer of random current type and anti-detection method |
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| CN102735985A CN102735985A (en) | 2012-10-17 |
| CN102735985B true CN102735985B (en) | 2016-05-25 |
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| CN107403798B (en) * | 2017-08-11 | 2019-02-19 | 北京兆易创新科技股份有限公司 | A kind of chip and its detection method |
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