CN107045617B - Device and method for identifying authenticity of IC card - Google Patents
Device and method for identifying authenticity of IC card Download PDFInfo
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- CN107045617B CN107045617B CN201710127621.XA CN201710127621A CN107045617B CN 107045617 B CN107045617 B CN 107045617B CN 201710127621 A CN201710127621 A CN 201710127621A CN 107045617 B CN107045617 B CN 107045617B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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Abstract
A device and method for distinguishing the true and false of IC card, couple IC card reader-writer with main control board, take charge of the information interaction between main control board and IC card, namely the card is swiped; the micro voltage amplifier is connected with an antenna receiving end of the IC card reader-writer and amplifies alternating voltage signals received by the antenna; the bridge rectifier circuit is responsible for converting the amplified alternating signals into direct-current voltage signals; when a new card is swiped for the first time, the main control board collects direct-current voltage signals output by the bridge rectifier circuit and carries out AD conversion, the obtained numerical value is processed to remove common-mode interference, the common-mode interference is marked as dimensionless IC card excitation voltage and is associated with an IC card number, and the dimensionless IC card excitation voltage is stored in a background database through a network; when the card is later swiped, if the card number is not matched with the excitation voltage and the database storage information, the card is judged to be a false card.
Description
Technical Field
The invention belongs to the technical field of electronic security and radio frequency identification, and particularly relates to a device and a method for identifying the authenticity of an IC card.
Background
The IC card is widely applied to various industries of society, such as campus card, entrance guard card, elevator card and bank card. However, now, some lawbreakers copy the IC card by special means and use the copied card to perform illegal activities, which creates huge potential safety hazards for the safety of life and property of people.
Disclosure of Invention
In order to overcome the disadvantages of the prior art, the present invention provides an apparatus and method for identifying the authenticity of an IC card, which can identify an original card and a copy card, and has the characteristics of high reliability and wide application range.
In order to achieve the purpose, the invention adopts the technical scheme that:
an apparatus for authenticating an IC card, comprising:
an IC card reader/writer 5 with an antenna for reading an IC card;
the input end of the micro voltage amplifier 1 is connected with an antenna of the IC card reader-writer 5, receives an excitation voltage signal at the antenna end when reading the card and amplifies the excitation voltage signal;
the input end of the bridge rectifier circuit 2 is connected with the output end of the tiny voltage amplifier 1, and the alternating voltage signal is converted into a direct current voltage signal;
the main control board 3 is connected with the output end of the bridge rectifier circuit 2, receives the direct-current voltage signal, carries out AD conversion to obtain an excitation voltage V, associates the excitation voltage V with the card number, compares the excitation voltage V with the stored signal, and identifies the card as a true card if the excitation voltage V is consistent with the card number, or identifies the card as a false card if the excitation voltage V is inconsistent with the card number;
and the LCD display screen 4 is connected with the main control panel 3 and displays the identification result.
The IC card reader-writer 5 is provided with a card slot at the position of the antenna, so that the relative position of the IC card reader-writer and the IC card is fixed when the card is swiped every time.
The antenna of the IC card reader-writer 5 is connected with a 3296W-10010 ohm potentiometer in series to calibrate the IC card reader-writer.
The IC card reader/writer 5 is model RC 522.
The core device of the micro voltage amplifier 1 adopts AD620, and can amplify millivolt-level alternating current and direct current signals by 1000 times.
The main control board 3 communicates with the background database 6 through a network interface, stores the collected IC card excitation voltage V and the card number into the database, and performs information query in the background database 6 through the card number during identification.
The invention also provides a method for identifying the authenticity of the IC card by using the device for identifying the authenticity of the IC card, which comprises the following steps:
before use, the initial voltage values of the antennas of the reader-writer 5 are calibrated through the potentiometer, and the initial voltage values of the antennas of all the card readers 5 are ensured to be consistent;
the method comprises the steps that a tiny voltage amplifier 1 is used for receiving an excitation voltage signal at the antenna end of an IC card reader-writer 5, the excitation voltage signal is amplified, a bridge rectifier circuit 2 is used for converting the excitation voltage signal from an alternating signal into a direct current signal, a main control board 3 carries out AD conversion on the direct current signal to obtain a dimensionless signal u, the value of the signal u obtained before card swiping is recorded as u0, the value of the signal u obtained during card swiping is recorded as u1, common mode interference caused by differences of acquisition devices is removed through u1-u0, the result is recorded as V, the V is the excitation voltage of the IC card to an antenna, the V value is not influenced by hardware differences of the IC card reader-writer 5, the tiny voltage amplifier 1 and the bridge rectifier circuit 2, and is independent of an acquisition platform and only related to the differences of the IC card;
recording an excitation voltage V obtained by a main control board when a new card is swiped for the first time as V0, associating the excitation voltage V with the card number, and storing the excitation voltage V into a background database 6;
when the card is swiped again, the obtained excitation voltage V is marked as V1 and is associated with the card number, the obtained excitation voltage V is compared with the excitation voltage V0 of the card in the background database 6, if the obtained data are consistent, the card is identified as a true card, and if the obtained data are inconsistent, the card is identified as a false card.
Compared with the prior art, the invention has the beneficial effects that: the invention collects the excitation voltage generated on the antenna of the IC card reader when the IC card is swiped to judge the authenticity of the IC card, and the excitation voltage V obtained by each IC card is different due to various factors such as production process and the like, and the values of the excitation voltage V are randomly distributed, so the reliability is high, the cracking difficulty is high, the identification of the copied card is effectively realized, and the safety of the IC card is improved.
Drawings
Fig. 1 is a block diagram of the hardware configuration of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, a device for identifying the authenticity of an IC card comprises an IC card reader/writer 5, wherein the IC card reader/writer 5 is connected with a main control board 3; the input end of the micro voltage amplifier 1 is connected with an antenna of the IC card reader-writer 5, the input end of the bridge rectifier circuit 2 is connected with the output end of the micro voltage amplifier 1, and the output end of the bridge rectifier circuit 2 is connected with the main control panel 3. The main control board 3 is connected with the LCD display screen 4, and displays the true and false result of the IC card when the card is swiped. The IC card reader-writer 5 is provided with a card slot at the position of the antenna, so that the relative position between the IC card and the card reader is fixed when the card is read each time. The main control board 3 can perform AD conversion on the voltage signal output by the bridge rectifier circuit 2 to obtain the excitation voltage V and associate the excitation voltage V with the card number. The main control board 3 can communicate with the background database 6 through a network interface, store the collected IC card excitation voltage V and the card number to the database, and can query information in the background database through the card number.
The IC card reader/writer 5 is model RC522, and its antenna is connected in series with 3296W-10010 ohm potentiometer, which can be calibrated.
The core device of the micro voltage amplifier 1 adopts AD620, and can amplify millivolt-level alternating current and direct current signals by 1000 times.
As shown in fig. 2: a method for identifying the authenticity of an IC card, when IC cards of different manufacturers, different batches and different types are subjected to card swiping operation by an IC card reader-writer 5, the amplitude of voltage signals excited at an antenna receiving end is different, the voltage signals at the antenna receiving end of the IC card reader-writer 5 are collected and amplified through a tiny voltage amplifier 1, and the amplified signals are output to a bridge rectifier circuit 2;
the bridge rectifier circuit 2 is responsible for converting the received alternating signals into direct-current voltage signals and outputting the direct-current voltage signals to the main control board 3.
The main control board 3 performs AD conversion on the direct current signal to obtain a dimensionless signal u, the value of the signal u obtained before card swiping is recorded as u0, the value of the signal u obtained during card swiping is recorded as u1, common mode interference caused by the difference of the acquisition devices is removed through u1-u0, the obtained result is recorded as V, the V is the excitation voltage of the IC card to the antenna, the V value is not influenced by the hardware difference of the IC card reader-writer 5, the tiny voltage amplifier 1 and the bridge rectifier circuit 2, and is independent of the acquisition platform and only related to the difference of the IC card.
Recording an excitation voltage V obtained by a main control board when a new card is swiped for the first time as V0, associating the excitation voltage V with the card number, and storing the excitation voltage V into a background database 6;
when the card is swiped again, the obtained excitation voltage V is marked as V1 and is associated with the card number, the obtained excitation voltage V is compared with the excitation voltage V0 of the card in the background database (6), if the obtained excitation voltage V is consistent with the card number, the card is identified as a true card, and if the obtained excitation voltage V is inconsistent with the card number, the card is identified as a false card and is displayed on the LCD display screen 4.
The main control board 3 stores the card number read by the IC card reader and the excitation voltage V in association with each other in order to ensure that the IC card is also the original card while the information in the card is correct.
Referring to fig. 2, the working flow of the present invention is as follows: collecting and amplifying voltage signals at an antenna receiving end of an IC card reader-writer 5 in a card swiping process through a tiny voltage amplifier 1, and outputting the amplified signals to a bridge type rectifying circuit 2; the bridge rectifier circuit 2 is responsible for converting the received alternating signals into direct-current voltage signals and outputting the direct-current voltage signals to the main control panel 3;
the main control board 3 acquires the direct-current voltage signal output by the bridge rectifier circuit 2 and performs AD conversion to obtain a dimensionless signal u, the value of the signal u obtained before card swiping is recorded as u0, the value of the signal u obtained during card swiping is recorded as u1, common mode interference caused by the difference of the acquisition devices is removed through u1-u0, and the obtained result is recorded as V.
Recording an excitation voltage V obtained by a main control board when a new card is swiped for the first time as V0, associating the excitation voltage V with the card number, and storing the excitation voltage V into a background database 6;
when the card is swiped again, the obtained excitation voltage V is marked as V1 and is associated with the card number, the obtained excitation voltage V is compared with the excitation voltage V0 of the card in the background database (6), if the obtained excitation voltage V is consistent with the card number, the card is identified as a true card, and if the obtained excitation voltage V is inconsistent with the card number, the card is identified as a false card and is displayed on the LCD display screen 4.
Claims (7)
1. An apparatus for authenticating an IC card, comprising:
an IC card reader/writer (5) with an antenna for reading an IC card;
the input end of the micro voltage amplifier (1) is connected with an antenna of the IC card reader-writer (5), receives an excitation voltage signal at the antenna end when reading the card and amplifies the excitation voltage signal;
the input end of the bridge rectifier circuit (2) is connected with the output end of the tiny voltage amplifier (1) and converts the alternating voltage signal into a direct current voltage signal;
the main control board (3) is connected with the output end of the bridge rectifier circuit (2), receives the direct-current voltage signal and carries out AD conversion to obtain a dimensionless signal u, the value of the signal u obtained before card swiping is recorded as u0, the value of the signal u obtained during card swiping is recorded as u1, common mode interference caused by the difference of the acquisition devices is removed through u1-u0, the result is recorded as V, the V is the excitation voltage of the IC card to the antenna, the excitation voltage V is associated with the card number and is compared with the stored signal, if the signal is consistent, the card is identified as a true card, and if the signal is inconsistent, the card is identified as a false card;
and the LCD display screen (4) is connected with the main control panel (3) and displays the identification result.
2. The apparatus for authenticating the authenticity of an IC card according to claim 1, wherein the IC card reader/writer (5) is provided with a card slot at the position of the antenna to ensure that the position relative to the IC card is fixed every time the card is swiped.
3. The apparatus for authenticating the authenticity of an IC card according to claim 1, wherein the antenna of the IC card reader/writer (5) is calibrated by connecting in series a 3296W-10010 ohm potentiometer.
4. The apparatus for authenticating an IC card according to claim 1, wherein the IC card reader/writer (5) has a model number RC 522.
5. The apparatus for authenticating the authenticity of an IC card according to claim 1, wherein the core device of the micro voltage amplifier (1) is AD620 capable of amplifying millivolt level ac/dc signals by 1000 times.
6. The apparatus for authenticating the authenticity of an IC card according to claim 1, wherein the main control board (3) communicates with the background database (6) through a network interface, stores the collected excitation voltage V of the IC card and the card number in the database, and performs information inquiry in the background database (6) through the card number during authentication.
7. A method for discriminating authenticity of an IC card using the apparatus for discriminating authenticity of an IC card according to claim 1, characterized in that:
before the card reader is used, the initial voltage values of the antennas of the reader-writer (5) are calibrated through a potentiometer, and the initial voltage values of the antennas of all the card readers (5) are ensured to be consistent;
the method comprises the steps that an excitation voltage signal at the antenna end of an IC card reader-writer (5) is received by a tiny voltage amplifier (1) and amplified, the excitation voltage signal is converted into a direct current signal from an alternating signal by a bridge rectifier circuit (2), the direct current signal is subjected to AD conversion by a main control board (3) to obtain a dimensionless signal u, the value of the signal u obtained before card swiping is recorded as u0, the value of the signal u obtained during card swiping is recorded as u1, common mode interference caused by differences of acquisition devices is removed through u1-u0, the result is recorded as V, the V is the excitation voltage of the IC card to an antenna, the V value is not influenced by hardware differences of the IC card reader-writer (5), the tiny voltage amplifier (1) and the bridge rectifier circuit (2), and is independent of an acquisition platform and only related to the differences of the IC card;
marking an excitation voltage V obtained by a main control board when a new card is swiped for the first time as V0, associating the excitation voltage V with the card number, and storing the excitation voltage V into a background database (6);
when the card is swiped again, the obtained excitation voltage V is marked as V1 and is associated with the card number, the obtained excitation voltage V is compared with the excitation voltage V0 of the card in the background database (6), if the data are consistent, the card is identified as a true card, and if the data are inconsistent, the card is identified as a false card.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710127621.XA CN107045617B (en) | 2017-03-06 | 2017-03-06 | Device and method for identifying authenticity of IC card |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710127621.XA CN107045617B (en) | 2017-03-06 | 2017-03-06 | Device and method for identifying authenticity of IC card |
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| CN107045617A CN107045617A (en) | 2017-08-15 |
| CN107045617B true CN107045617B (en) | 2020-01-21 |
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| CN201710127621.XA Active CN107045617B (en) | 2017-03-06 | 2017-03-06 | Device and method for identifying authenticity of IC card |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288546A (en) * | 1998-01-23 | 2001-03-21 | 艾普－特普格霍尔德科公司 | Device and method for recognizing authentic electronic integrated circuit cards |
| CN1971579A (en) * | 2005-11-24 | 2007-05-30 | 上海华虹集成电路有限责任公司 | Method for judging validity of non-contact intelligent card |
| CN102073838A (en) * | 2010-12-24 | 2011-05-25 | 兆日科技（深圳）有限公司 | Method and system for preventing counterfeit by using differentiation of electromagnetic signals of RFID |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090201133A1 (en) * | 2007-12-03 | 2009-08-13 | Skyetek, Inc. | Method For Enhancing Anti-Cloning Protection of RFID Tags |
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- 2017-03-06 CN CN201710127621.XA patent/CN107045617B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288546A (en) * | 1998-01-23 | 2001-03-21 | 艾普－特普格霍尔德科公司 | Device and method for recognizing authentic electronic integrated circuit cards |
| CN1971579A (en) * | 2005-11-24 | 2007-05-30 | 上海华虹集成电路有限责任公司 | Method for judging validity of non-contact intelligent card |
| CN102073838A (en) * | 2010-12-24 | 2011-05-25 | 兆日科技（深圳）有限公司 | Method and system for preventing counterfeit by using differentiation of electromagnetic signals of RFID |
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| CN107045617A (en) | 2017-08-15 |
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