CN111639736A - Anti-counterfeiting method of RFID chip - Google Patents
Anti-counterfeiting method of RFID chip Download PDFInfo
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- CN111639736A CN111639736A CN202010484521.4A CN202010484521A CN111639736A CN 111639736 A CN111639736 A CN 111639736A CN 202010484521 A CN202010484521 A CN 202010484521A CN 111639736 A CN111639736 A CN 111639736A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0722—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips comprising an arrangement for testing the record carrier
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
- G06K19/07309—Means for preventing undesired reading or writing from or onto record carriers
- G06K19/07372—Means for preventing undesired reading or writing from or onto record carriers by detecting tampering with the circuit
- G06K19/07381—Means for preventing undesired reading or writing from or onto record carriers by detecting tampering with the circuit with deactivation or otherwise incapacitation of at least a part of the circuit upon detected tampering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07745—Mounting details of integrated circuit chips
Abstract
The invention discloses an anti-counterfeiting method of an RFID chip, which is characterized in that detection pins are detected only by an RFID label working moment under the condition of no continuous external power supply, a nonpolar chip packaging design mode is adopted, a plurality of external detection pins are used, the external connection states are independently detected by the plurality of detection pins, signals of all the detection pins are different, and a plurality of external connecting circuits are designed to enable the external connecting circuits to have different circuit impedances or inductive impedances.
Description
Technical Field
The invention belongs to the field of semiconductor chip design, and particularly relates to an anti-counterfeiting method of an RFID chip.
Background
At present, the electronic product piracy problem in the market is rare, many pirated products use the recovered disassembling chips of the genuine products to produce and assemble again, and common consumers are difficult to distinguish the authenticity of the products from the function.
Most of the current universal chips are polar in design, convenient to distinguish and use, easy to distinguish directions, and each pin has unique function definition and cannot be used in a mixed mode. The chips with the anti-removal function mostly need external power supply, the working state of the chips is maintained, real-time detection can be achieved, and once the chips are removed or attacked, the states of the chips are rewritten or the chips are locked, so that the chips cannot be reused; few of anti-removal detection chips without continuous power supplies are simple in design and single in detection circuit at present, and on the premise that the chips are not destroyed, illegal persons can recover the chips in batches and copy products again, so that the aims of filling with good time and falsely are fulfilled. Typical applications such as RFID anti-counterfeit labels and the like have a large number of chips which are recycled and reused by illegal merchants.
Disclosure of Invention
The invention aims to provide an anti-counterfeiting method of an RFID chip, which can reduce or even prevent the possibility of recycling the chip.
In order to solve the problems, the technical scheme of the invention is as follows:
an anti-counterfeiting method of an RFID chip comprises the following steps:
one or more groups of pins of the RFID chip are used as detection pins for detecting the state of the RFID chip;
setting a pin state register and a safety detection state register corresponding to the detection pin in the RFID chip;
setting a chip initialization logic unit in an RFID chip, when an RFID reader initializes the RFID chip, performing signal matching on a detection pin of the RFID chip according to a pin detection rule preset in the initialization logic unit, and writing a matching result into a pin state register;
in each power-on process after the RFID chip is initialized, firstly, detecting the state of the safety detection state register; and if the detection result is set, the RFID chip enters a destruction state and sends out a destruction prompt signal.
According to an embodiment of the invention, if the detection result of the safety detection state register is not set, the detection pins are detected pair by pair, the detection result is compared with the state stored in the corresponding pin state register, if the detection result is the same as the state stored in the corresponding pin state register, the RFID chip is judged not to be removed or destroyed, and the RFID chip enters a standard mode; and if the two are different, setting the safety detection state register and entering a destruction mode.
According to an embodiment of the present invention, the pin detection rule preset in the initialization logic unit is to sequentially extract one detection pin from the one or more groups of detection pins, compare the detection pins with other detection pins one by one for input signals, determine that the detection pins are matched if the input signals of the two detection pins are the same, and initialize a corresponding pin status register value to be 1;
if the input signals of the two detection pins are different, mismatching is judged, and the corresponding pin state register value is initialized to be 0.
According to an embodiment of the present invention, the pin status register is a one-time programming register.
According to one embodiment of the invention, a plurality of induction lines are connected with the detection pin, and when an RFID reader reads an RFID chip, different induction lines generate induction signals with different energies.
According to an embodiment of the invention, the RFID chip is packaged in a non-polar packaging mode.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) aiming at the piracy problem that the information of the RFID chip is recycled by recycling the RFID chip generally at present, the anti-counterfeiting method of the RFID chip in one embodiment of the invention judges whether the RFID chip is recycled and reused or not by comparing the detection of the mutual connection state of the detection pins with the pin state of the RFID chip during initialization at the working moment of the RFID label without continuous external power supply, thereby greatly reducing the success rate of recycling the chip.
2) The anti-counterfeiting method of the RFID chip in the embodiment of the invention aims at the piracy problem that the information of the RFID chip is recycled by recycling the RFID chip generally at present, and determines whether the RFID chip is destroyed or not by detecting the safety detection state register and judging whether the RFID chip is set or not at the moment of electrifying the RFID label on the premise of not continuously supplying power to the outside, thereby reducing or even preventing the RFID chip from being recycled.
3) In the anti-counterfeiting method of the RFID chip in the embodiment of the invention, aiming at the piracy problem that the information of the RFID chip is recycled and reused by the current common RFID chip, the pin state register in the RFID chip is a one-time programming register, can be burned once, cannot be changed and cannot be recovered once being burned, and the RFID chip is prevented from being recycled and reused.
4) According to the anti-counterfeiting method for the RFID chip, the RFID chip is packaged in a non-polar packaging mode, so that mutual replacement of pins can be realized, the function of the RFID chip is not influenced by the chip mounting direction, the specific mounting direction is not provided, and the success rate of recycling the RFID chip is reduced.
Drawings
FIG. 1 is a schematic diagram of an anti-counterfeit method for an RFID chip according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a front side of a package of a conventional RFID chip according to an embodiment of the invention;
FIG. 3 is a schematic illustration of the reverse side of a conventional package for an RFID chip in an embodiment of the invention;
FIG. 4 is a schematic view of the reverse side of a non-polar multi-inspection pin chip package in an embodiment of the invention;
FIG. 5 is a schematic view of the reverse side of a chip package with multiple detection pins having polarity according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a signal comparison array according to an embodiment of the present invention;
FIG. 7 is a flowchart of the power-on detection of the security detection status register of the RFID chip according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a non-polar multi-detection pin chip sensing circuit according to an embodiment of the invention;
FIG. 9 is a schematic diagram of the external circuit of the chip with multiple detection pins and polarities thereof according to an embodiment of the present invention;
fig. 10 is a schematic diagram of external circuits of a chip with polarity multiple detection pins according to an embodiment of the invention.
Detailed Description
The following describes an anti-counterfeit method of an RFID chip according to the present invention in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
Aiming at the piracy problem that the information of the RFID chip is recycled and reused by the current common RFID chip, the invention provides an anti-counterfeiting method of the RFID chip, which comprises the following steps of:
s1: one or more groups of pins of the RFID chip are used as detection pins for detecting the state of the RFID chip;
s2: setting a pin state register and a safety detection state register corresponding to the detection pin in the RFID chip;
s3: setting a chip initialization logic unit in the RFID chip, when an RFID reader initializes the RFID chip, performing signal matching on a detection pin of the RFID chip according to a pin detection rule preset in the initialization logic unit, and writing a matching result into a pin state register;
s4: in each power-on process after the RFID chip is initialized, firstly, detecting the state of a safety detection state register; and if the detection result is set, the RFID chip enters a destruction state and sends out a destruction prompt signal.
The core idea of the invention is that on the premise of not needing continuous external power supply, only the RFID label works instantly, whether the chip is recycled and reused is judged by comparing the detection of the mutual connection state of the external pins with the pin state of the chip during initialization, and the problem that the chip is recycled and used in batch is avoided from the realization angle of probability.
Specifically, the measures adopted by the invention mainly comprise the following four points:
1. the chip packaging mode is adopted, the chip adopts a rotation compatible design mode, no direction mark is arranged on the chip packaging, and the chip can be pasted in any direction.
A common chip design with polarity is shown in fig. 2 and 3, and generally marks the chip at a certain corner of the chip to distinguish the orientation of the chip. The invention provides a non-polar chip design form, as shown in fig. 4 (taking a 12-pin chip as an example):
the chip pins 1-1, 2-1, 3-1 and 4-1 are defined as interfaces with the same attribute, and the same interfaces 1-2, 2-2, 3-2, 4-2, 1-3, 2-3, 3-3 and 4-3 are also defined as interfaces with the same attribute respectively, so that mutual substitution after rotation can be realized, namely, the chip function is not influenced by the chip mounting direction.
2. A plurality of detection pins are adopted, the more detection pins are used, and the lower the success rate of the chip which is recycled and reused is.
As shown in fig. 4, one or more of the groups (1-1, 2-1, 3-1, 4-1), (1-2, 2-2, 3-2, 4-2), (1-3, 2-3, 3-3, 4-3) are selected as the detection pins for detecting the state of the chip, and the other pins are the functional pins of the chip.
3. The pin state register and the safety detection state register in the chip are designed by one-time programming, and once the chip is burnt, the chip cannot be modified and recovered, so that the success rate of recycling the chip is further reduced.
4. The detection pins are connected by various induction lines, each detection pin can be selected to be suspended, and the pins can be connected in a one-to-one mode, in a one-to-many mode and the like. Different detection pin connections of the same chip can be combined in multiple modes, and each group of connecting wires uses different induction circuit paths.
According to actual needs, one or more combinations of the four measures can be selected to achieve the purpose of preventing the chips from being recycled in batches.
The following takes the RFID chip as an example to explain the principle of the anti-counterfeiting method of the RFID chip of the invention:
the connecting line between the detection pins of the RFID chip on the circuit board is designed into different induction circuit paths, different circuits have different impedances, and when the RFID reader reads the RFID tag, different circuit paths can generate induction signals with different energy sizes in an induction mode. In the process of initializing the RFID chip by the RFID reader, the detection pins of the RFID chip are compared with other detection pins one by one according to a certain sequence, if the input signals of the two detection pins are the same, the two detection pins are considered to be matched, and the corresponding pin state register value is initialized to 1; if the input signals of the two detection pins are different, the two detection pins are considered to be not matched, and the corresponding pin state register value is initialized to be 0. As shown in fig. 6, the comparator array in the chip has pins 1 to (n-1) represented in the longitudinal direction as input signals of the 1 st to the n-1 st detection pins, and pins 2 to n represented in the transverse direction as input signals of the 2 nd to the n th detection pins, and compares the input signals of every two pins in sequence to ensure that signal matching is performed between any two pins. After the chip compares and detects the external detection pins one by one, the matching state of the pins is written into the pin state registers, if the pins are successfully matched, the value of the corresponding pin state register is set to 1, if the pins are not matched, the value of the corresponding pin state register is set to 0, and so on until the RFID chip completes the initialization of all the pin state registers. The status register of the pin is designed by one-time programming, can be burnt once, and cannot be changed or restored after burning. In the subsequent power-on process, the RFID chip firstly detects the value of the safety detection state register, and if the value of the safety detection state register is set, the RFID chip enters a destruction state and sends out a destruction prompt signal. If the value of the safety detection register is not set, detecting the detection pins one by one, wherein the detection process is similar to the initialization detection process, the RFID chip compares whether the detection result is the same as the state stored in the corresponding pin state register, if so, the chip is not removed or destroyed, and the chip enters a standard mode; and if the detection result is different from the state in the corresponding pin state register, setting the safety detection state register, and considering that the safety detection state register is removed or destroyed. When the RFID chip is detected to be removed or destroyed, the RFID chip automatically enters a destruction mode, and then the destruction prompt is sent out every time the RFID chip is powered on. The safety detection state register adopts a one-time programming design, can be burned once, and cannot be changed or restored once being burned. Fig. 7 is a flowchart illustrating the detection of the security detection status register when the chip is powered on.
The following briefly introduces a specific operation process of the anti-counterfeiting method of the RFID chip of the invention:
as shown in fig. 8, a 12-pin non-polar chip package is taken as an example.
1-1, 2-1, 3-1, 4-1, 1-3, 2-3, 3-3 and 4-3 are detection pins of the chip, 1-2, 2-2, 3-2 and 4-2 are different pins with the same function, and in actual use, only one or a plurality of pins need to be connected.
1-1, 2-1, 3-1, 4-1, 1-3, 2-3, 3-3, 4-3 detect the interconnection status of the pins, such as the connection of pins 1-1 and 2-3, pins 1-3 and 3-3 and 4-1 in FIG. 8.
In the process of initializing the RFID chip, the detection pins are compared and detected one by one according to a certain sequence, for example, firstly, the input signal of the 1-1 pin is compared with the input signals of the 2-1, 3-1, 4-1, 1-3, 2-3, 3-3 and 4-3 pins, if the input signals are the same, the matching is successful, and meanwhile, the value of a pin state register in the corresponding chip is set to be 1; if the difference is not, the matching is considered to be failed, and meanwhile, the value of the pin state register in the corresponding chip is set to be 0. By analogy, 2-1, 3-1, 4-1, 1-3, 2-3, 3-3 and 4-3 are respectively matched with other detection pins. Finally, the detection pin matching is completed. The four corresponding pin status register values of 1-1 and 2-3, 1-3 and 3-3, 3-3 and 4-1, 1-3 and 4-1 are set to 1 and the other status register values are set to 0. After the initialization is completed, the value of the pin state register stored in the chip can not be modified.
In the subsequent power-on process, the chip firstly checks the value of the safety detection state register, and if the value of the safety detection state register is set, the chip enters a destruction state and sends a destruction prompt signal; if the value of the security check status register is not set, the connection status of the pin is checked, and the checking process is similar to the above-mentioned initialized checking process. If the connection state of the detection pin is the same as the value of a pin state register stored in the chip, the chip environment is considered to be unchanged, the chip environment is not removed or destroyed, and the chip enters a standard mode; if the connection state of the detection pin is different from the value of the pin state register stored in the chip, the chip sets the safety detection state register, considers that the safety detection state register is attacked or destroyed, enters a destruction mode and provides corresponding prompt information.
Taking the 8 detection pins shown in fig. 5 as an example, for the same kind of inductive connecting circuit, since the RFID chip has four directions, there are four possible actual connection states. To the same chip direction, can have several induction connection mode. By designing various different induction connecting circuits, the success rate of chip batch recycling can be reduced to below 0.01 percent to the maximum.
In addition, the invention also provides an anti-counterfeiting operation process of the RFID chip packaged by the 8-pin polar chip, which comprises the following steps:
as shown in fig. 9 and 10. 1-1 and 1-2 are functional pins of the RFID chip, and 2-1, 2-2, 3-1, 3-2, 4-1 and 4-2 are detection pins of the RFID chip. The dashed lines in the dashed rounded rectangular areas indicate that the inductive connections are hidden or fragile and not directly accessible.
Six pins, 2-1, 2-2, 3-1, 3-2, 4-1, and 4-2, will detect the interconnection status of the pins, as shown in fig. 9, pins 2-1 and 3-1, 2-2 and 4-2, and pins 3-2 and 4-1 are connected; in FIG. 10, pins 2-1 and 3-2, 2-2 and 4-2 are connected, pin 4-1 is floating, and no signal is connected.
In the initialization process of the RFID chip, pairwise comparison detection is carried out on the connection states of the detection pins according to a certain sequence. For example, the input signal of the 2-1 pin is compared with the input signals of the 3-1, 4-1, 2-2, 3-2 and 4-2 pins for detection, if the signals are the same, the matching is considered to be successful, and meanwhile, the value of the corresponding pin state register in the chip is set to be 1; if the difference is not, the matching is considered to be failed, and meanwhile, the value of the pin state register in the corresponding chip is set to be 0. By analogy, 3-1, 4-1, 2-2, 3-2 and 4-2 are respectively matched with other pins. Finally, the detection pin matching is completed. In the connection manner of fig. 9, the values of the pin status registers corresponding to three groups, i.e., 2-1 and 3-1, 2-2 and 4-2, 3-2 and 4-1, are set to 1, and the values of the other pin status registers are set to 0; in the connection scheme of fig. 10, the values of the pin status registers corresponding to the four groups 2-1 and 3-1, 3-1 and 3-2, 2-2 and 4-2 are set to 1, and the values of the other pin status registers are set to 0. After the initialization is completed, the value of the pin state register stored in the chip can not be modified.
In the subsequent power-on process, the chip firstly checks the value of the safety detection state register, and if the value of the safety detection state register is set, the chip enters a destruction state and sends a destruction prompt signal; if the value of the safety detection state register is not set, the connection state of the pin induction line is detected, and the detection process is similar to the detection process of the initialization. If the connection state of the detection pin is the same as the value of a pin state register stored in the chip, the chip environment is considered to be unchanged and is not removed or destroyed, and the chip enters a standard mode; if the connection state of the detection pin is different from the value of the pin state register stored in the chip, the chip sets the safety detection state register, considers that the safety detection state register is attacked or destroyed, enters a destruction mode and provides corresponding prompt information.
By taking 6 detection pins as an example, through designing various different induction connecting circuits, the success rate of recycling the chips can be reduced to 0.32% to the maximum extent, and the success rate of recycling the chips in batches is greatly reduced.
In summary, the invention detects the detection pins only by the working moment of the RFID tag under the condition of no continuous external power supply, and from the perspective of probability, the problem of recycling the chip becomes no longer economic in actual operation by means of a non-polar chip design, multiple detection pins, different detection signals of each pin, and multiple induction connection lines, thereby avoiding the situation that the chip is recycled and reused.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. An anti-counterfeiting method of an RFID chip is characterized by comprising the following steps:
one or more groups of pins of the RFID chip are used as detection pins for detecting the state of the RFID chip;
setting a pin state register and a safety detection state register corresponding to the detection pin in the RFID chip;
setting a chip initialization logic unit in an RFID chip, when an RFID reader initializes the RFID chip, performing signal matching on a detection pin of the RFID chip according to a pin detection rule preset in the initialization logic unit, and writing a matching result into a pin state register;
in each power-on process after the RFID chip is initialized, firstly, detecting the state of the safety detection state register; and if the detection result is set, the RFID chip enters a destruction state and sends out a destruction prompt signal.
2. The anti-counterfeiting method for the RFID chip according to claim 1, wherein if the detection result of the safety detection state register is not set, the detection pins are detected pair by pair, the detection result is compared with the state stored in the corresponding pin state register, and if the detection result is the same as the state stored in the corresponding pin state register, the RFID chip is judged not to be removed or destroyed, and the RFID chip enters a standard mode; and if the two are different, setting the safety detection state register and entering a destruction mode.
3. The anti-counterfeit method for the RFID chip according to claim 1, wherein the pin detection rule preset in the initialization logic unit is to sequentially extract a detection pin from the one or more groups of detection pins, compare the detection pin with other detection pins one by one for input signals, determine that the two detection pins are matched if the input signals of the two detection pins are the same, and initialize the corresponding pin status register value to 1;
if the input signals of the two detection pins are different, mismatching is judged, and the corresponding pin state register value is initialized to be 0.
4. The anti-counterfeiting method for the RFID chip according to any one of claims 1 to 3, wherein the pin status register is a one-time programming register.
5. The anti-counterfeiting method for the RFID chip according to claim 1, wherein a plurality of sensing lines are connected to the detection pin, and when an RFID reader reads the RFID chip, different sensing lines generate sensing signals with different energies.
6. The method of claim 1, wherein the RFID chip is encapsulated in a non-polar encapsulation.
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| CN202010484521.4A CN111639736A (en) | 2020-06-01 | 2020-06-01 | Anti-counterfeiting method of RFID chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113076140A (en) * | 2021-03-26 | 2021-07-06 | 山东英信计算机技术有限公司 | GPIO (general purpose input/output) configuration detection method and device and server |
| CN115577670A (en) * | 2022-12-07 | 2023-01-06 | 北京紫光芯能科技有限公司 | Electronic chip, detection method of electronic chip and electronic equipment |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113076140A (en) * | 2021-03-26 | 2021-07-06 | 山东英信计算机技术有限公司 | GPIO (general purpose input/output) configuration detection method and device and server |
| CN113076140B (en) * | 2021-03-26 | 2023-02-28 | 山东英信计算机技术有限公司 | GPIO (general purpose input/output) configuration detection method and device and server |
| CN115577670A (en) * | 2022-12-07 | 2023-01-06 | 北京紫光芯能科技有限公司 | Electronic chip, detection method of electronic chip and electronic equipment |
| CN115577670B (en) * | 2022-12-07 | 2023-03-10 | 北京紫光芯能科技有限公司 | Electronic chip, detection method of electronic chip and electronic equipment |
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