Radio frequency signal intelligent card with key switch control and control method thereof

Abstract

The invention discloses a radio frequency signal smart card with key switch control and a control method thereof, and belongs to the field of smart cards, the device comprises a smart card body, the smart card body is internally provided with an outer ring radio frequency antenna, a radio frequency chip, a key switch, an LED lamp pole chip and an inner ring radio frequency antenna, and the outer ring radio frequency antenna is arranged at the edge in the intelligent card body. The key switch is pressed to enable the radio frequency chip and the LED lamp pole chip to form an access through the outer ring radio frequency antenna and the inner ring radio frequency antenna, and power is supplied to the radio frequency chip and the LED lamp pole chip through cooperation of a radio frequency field, the outer ring radio frequency antenna and the inner ring radio frequency antenna near a card reader. An algorithm is pre-stored in the key switch to generate a one-time password and transmit the one-time password to the card reader, unauthorized scanning is prevented, relay attacks are resisted, an LED indicating lamp on the LED lamp pole chip indicates the transaction state, using is more visual, experience is better, active safety control is achieved through a simple structure, and the encryption scheme is simple, convenient and superior to a pure software encryption scheme.

Description

Technical Field

[0001] The present invention belongs to the technical field of smart cards, and in particular relates to a radio frequency signal smart card with key switch control and a control method thereof. Background Art

[0002] Traditional RFID cards are often in a passive response state, making it easy for illegal card readers to steal data (such as NFC sniffing); there is no user-active control mechanism, which cannot prevent unauthorized scanning (such as a transportation card being swiped in a wallet); dynamic password cards (such as bank OPT cards) require an external display, which is expensive and relies on battery power; the current solution to these defects generally relies entirely on chip encryption, which cannot prevent interruption attacks; some cards block the card by blocking the antenna or adding an external frequency; the card prevents scanning, but the user experience is poor. Therefore, we designed a radio frequency signal smart card with key switch control and its control method, which controls the on and off of the radio frequency signal of the smart card chip through the switch, improves security, and is passively powered. Summary of the Invention

[0003] The purpose of the present invention is to provide a radio frequency signal smart card with key switch control and a control method thereof, which has the advantages of controlling the on and off of the radio frequency signal of the smart card chip through the switch, improving safety, and passive power supply, so as to solve the above-mentioned background technical problems.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A radio frequency signal smart card with key switch control includes a smart card body, wherein the smart card body is provided with an outer ring radio frequency antenna, a radio frequency chip, a key switch, an LED lamp post chip and an inner ring radio frequency antenna, the outer ring radio frequency antenna is arranged at the edge of the smart card body, the radio frequency chip is arranged in the upper middle position of the smart card body, the key switch is arranged in the lower right corner of the smart card body, the LED lamp post chip is arranged in the right middle position of the smart card body, the inner ring radio frequency antenna surrounds the outer side of the LED lamp post chip and is located on the inner side of the outer ring radio frequency antenna, four GPIO pins are provided on the key switch, the radio frequency chip is connected to the two GPIO pins on the right side of the key switch through the outer ring radio frequency antenna, and the LED lamp post chip is connected to the two GPIO pins on the left side of the key switch through the inner ring radio frequency antenna.

[0005] Preferably, the radio frequency chip is an NFC chip.

[0006] Preferably, the key switch is a machine key, a membrane key, or a combined tympanic membrane key switch.

[0007] Preferably, the radio frequency chip on the smart card body and the LED lamp post chip are powered by the outer ring radio frequency antenna, the inner ring radio frequency antenna and the radio frequency field on the card reader.

[0008] Preferably, the key switch is directly connected in series to the inner ring radio frequency antenna and the outer ring radio frequency antenna.

[0009] Preferably, the key switch triggers the chip to generate a dynamic one-time password.

[0010] Preferably, an algorithm for implementing specific control logic and operation is pre-set in the key switch.

[0011] A control method for a radio frequency signal smart card with key switch control, the control method is as follows:

[0012] The user presses the button switch to connect the RF chip and the LED lamp post chip through the outer ring RF antenna and the inner ring RF antenna respectively, and then approaches the card reader. The RF chip and the LED lamp post chip are powered by the cooperation of the card reader's RF field and the outer ring RF antenna and the inner ring RF antenna. The RF chip and the LED lamp post chip generate a one-time password through the pre-stored algorithm in the button switch, and send the one-time password to the card reader through the outer ring RF antenna and the inner ring RF antenna; during this period, the card responds to the card reader signal to make the LED indicator on the LED lamp post chip light up. During use, security is improved, unauthorized scanning is prevented, and relay attacks are resisted. No screen and complex circuits are required, the cost is low, one-button operation is required, and it is compatible with existing RFID card reading equipment.

[0013] The beneficial effects of the present invention are:

[0014] The present invention forms a path between the RF chip and the LED lamp post chip by pressing a button switch through the outer ring RF antenna and the inner ring RF antenna. The RF chip and the LED lamp post chip are powered by the RF field and the cooperation of the outer ring RF antenna and the inner ring RF antenna when close to the card reader. The pre-stored algorithm in the button switch generates a one-time password and transmits it to the card reader to prevent unauthorized scanning and combat relay attacks. The LED indicator light on the LED lamp post chip indicates the transaction status, which is more intuitive to use and provides a better experience. Active security control is achieved through a simple structure, which is concise and convenient, superior to pure software encryption solutions, and compatible with the ISO14443 protocol. There is no need to modify the existing card reader equipment to achieve the purpose of controlling the on and off of the RF signal of the smart card chip through the switch, thereby improving security, and passive power supply is achieved through the RF power supply of the card reader. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or other advantages of the present invention will become more clear and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0016] Figure 1 This is a schematic structural diagram of an embodiment of the present invention;

[0017] Figure 2 A schematic cross-sectional view of an embodiment of the present invention;

[0018] Figure 3 The figure is a circuit diagram of an embodiment of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1. Smart card body, 2. Outer ring RF antenna, 3. RF chip, 4. Push button switch, 5. LED lamp column chip, 6. Inner ring RF antenna. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of a radio frequency signal smart card with key switch control and a control method thereof according to the present invention will be described with reference to the accompanying drawings.

[0022] The embodiments described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are illustrative and exemplary and should not be construed as limiting the embodiments and scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the disclosure of the specification, including technical solutions that adopt any obvious substitutions and modifications to the embodiments described herein.

[0023] The drawings in this specification are schematic diagrams that assist in illustrating the concepts of the present invention and schematically illustrate the shapes of the various components and their interrelationships. Please note that to clearly illustrate the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0024] Example 1: Figure 1-3 An embodiment of the present invention shows a radio frequency signal smart card with key switch control, including a smart card body 1, in which an outer ring radio frequency antenna 2, a radio frequency chip 3, a key switch 4, an LED lamp post chip 5 and an inner ring radio frequency antenna 6 are arranged. The outer ring radio frequency antenna 2 is arranged at the edge of the smart card body 1, the radio frequency chip 3 is an NFC chip, and the radio frequency chip 3 is arranged in the upper middle position of the smart card body 1. The key switch 4 is arranged in the lower right corner of the smart card body 1, and the LED lamp post chip 5 is arranged in the middle right position of the smart card body 1. The inner ring radio frequency antenna 6 surrounds the outside of the LED lamp post chip 5 and is located on the inside of the outer ring radio frequency antenna 2. Four GPIO pins are arranged on the key switch 4. The radio frequency chip 3 is connected to the two GPIO pins on the right side of the key switch 4 through the outer ring radio frequency antenna 2, and the LED lamp post chip 5 is connected to the two GPIO pins on the left side of the key switch 4 through the inner ring radio frequency antenna 6.

[0025] Example 2: Figure 1-3An embodiment of the present invention shows a radio frequency signal smart card with key switch control, including a smart card body 1, in which an outer ring radio frequency antenna 2, a radio frequency chip 3, a key switch 4, an LED lamp post chip 5 and an inner ring radio frequency antenna 6 are arranged. The outer ring radio frequency antenna 2 is arranged at the edge of the smart card body 1, the radio frequency chip 3 is arranged in the middle and upper position of the smart card body 1, the key switch 4 is arranged in the lower right corner of the smart card body 1, the key switch 4 is a machine key, a membrane key, or a combined tympanic membrane key switch, the LED lamp post chip 5 is arranged in the middle and right position of the smart card body 1, the inner ring radio frequency antenna 6 surrounds the outside of the LED lamp post chip 5 and is located on the inside of the outer ring radio frequency antenna 2, four GPIO pins are arranged on the key switch 4, the radio frequency chip 3 is connected to the two GPIO pins on the right side of the key switch 4 through the outer ring radio frequency antenna 2, and the LED lamp post chip 5 is connected to the two GPIO pins on the left side of the key switch 4 through the inner ring radio frequency antenna 6.

[0026] Example 3: Figure 1-3 The present invention shows an embodiment of a radio frequency signal smart card with key switch control, including a smart card body 1, in which an outer ring radio frequency antenna 2, a radio frequency chip 3, a key switch 4, an LED lamp post chip 5 and an inner ring radio frequency antenna 6 are arranged. The outer ring radio frequency antenna 2 is arranged at the edge of the smart card body 1, the radio frequency chip 3 is arranged in the middle and upper part of the smart card body 1, and the key switch 4 is arranged in the lower right corner of the smart card body 1. The radio frequency chip 3 and the LED lamp post chip 5 on the smart card body 1 are powered by the radio frequency field on the card reader through the outer ring radio frequency antenna 2 and the inner ring radio frequency antenna 6. The ED lamp post chip 5 is arranged in the middle right position of the smart card body 1, the inner ring RF antenna 6 surrounds the outside of the LED lamp post chip 5 and is located on the inner side of the outer ring RF antenna 2, and four GPIO pins are arranged on the key switch 4. The RF chip 3 is connected to the two GPIO pins on the right side of the key switch 4 through the outer ring RF antenna 2, and the LED lamp post chip 5 is connected to the two GPIO pins on the left side of the key switch 4 through the inner ring RF antenna 6. Different types of LED lamp post chips may differ in terms of luminous color, brightness, efficiency, etc. to meet the needs of various application scenarios.

[0027] Example 4: Figure 1-3An embodiment of the present invention shows a radio frequency signal smart card with key switch control, including a smart card body 1, in which an outer ring radio frequency antenna 2, a radio frequency chip 3, a key switch 4, an LED lamp post chip 5 and an inner ring radio frequency antenna 6 are arranged. The outer ring radio frequency antenna 2 is arranged at the edge of the smart card body 1, the radio frequency chip 3 is arranged in the middle and upper part of the smart card body 1, the key switch 4 is arranged in the lower right corner of the smart card body 1, the key switch 4 is directly connected in series to the inner ring radio frequency antenna 6 and the outer ring radio frequency antenna 2, the LED lamp post chip 5 is arranged in the middle and right part of the smart card body 1, the inner ring radio frequency antenna 6 surrounds the outside of the LED lamp post chip 5 and is located on the inside of the outer ring radio frequency antenna 2, four GPIO pins are arranged on the key switch 4, the radio frequency chip 3 is connected to the two GPIO pins on the right side of the key switch 4 through the outer ring radio frequency antenna 2, and the LED lamp post chip 5 is connected to the two GPIO pins on the left side of the key switch 4 through the inner ring radio frequency antenna 6.

[0028] Embodiment 5: Figure 1-3 An embodiment of the present invention shows a radio frequency signal smart card with key switch control, including a smart card body 1, in which an outer ring radio frequency antenna 2, a radio frequency chip 3, a key switch 4, an LED lamp post chip 5 and an inner ring radio frequency antenna 6 are arranged. The outer ring radio frequency antenna 2 is arranged at the edge of the smart card body 1, the radio frequency chip 3 is arranged in the middle and upper part of the smart card body 1, the key switch 4 is arranged in the lower right corner of the smart card body 1, the key switch 4 is directly connected in series to the inner ring radio frequency antenna 6 and the outer ring radio frequency antenna 2, the LED lamp post chip 5 is arranged in the middle and right part of the smart card body 1, the inner ring radio frequency antenna 6 surrounds the outside of the LED lamp post chip 5 and is located on the inside of the outer ring radio frequency antenna 2, four GPIO pins are provided on the key switch 4, the radio frequency chip 3 is connected to the two GPIO pins on the right side of the key switch 4 through the outer ring radio frequency antenna 2, the LED lamp post chip 5 is connected to the two GPIO pins on the left side of the key switch 4 through the inner ring radio frequency antenna 6, the key switch 4 triggers the chip to generate a dynamic one-time password, and the key switch 4 is pre-set with an algorithm for implementing specific control logic and operations.

[0029] A control method for a radio frequency signal smart card with key switch control, the control method is as follows:

[0030] The user presses the button switch 4, so that the RF chip 3 and the LED lamp post chip 5 are connected through the outer ring RF antenna 2 and the inner ring RF antenna 6 respectively, and then approaches the card reader, and the RF chip 3 and the LED lamp post chip 5 are powered by the cooperation of the card reader's RF field and the outer ring RF antenna 2 and the inner ring RF antenna 6. The RF chip 3 and the LED lamp post chip 5 generate a one-time password through the pre-stored algorithm in the button switch 4, and send the one-time password to the card reader through the outer ring RF antenna 2 and the inner ring RF antenna 6; during this period, the card responds to the card reader signal to make the LED indicator on the LED lamp post chip 5 light up. During use, security is improved, unauthorized scanning is prevented, and relay attacks are resisted. No screen and complex circuits are required, the cost is low, one-button operation is required, and it is compatible with existing RFID card reading equipment.

[0031] It should be noted that the ISO14443 protocol is an international standard for contactless smart cards, which is commonly used in various short-range wireless communication application scenarios such as bus cards and access cards. Card reader design: To be compatible with this protocol, the card reader must have a radio frequency communication module that complies with the ISO14443 standard. Its operating frequency is usually 13.56MHz, and it can generate a suitable alternating magnetic field to achieve energy transfer and data interaction with the card. For example, when designing a bus card reader, it is necessary to precisely adjust parameters such as RF power and modulation mode, such as using ASK (Amplitude Shift Keying) modulation to encode the transmitted data, to ensure that the signal can be accurately sent to the card and the response signal returned by the card can be received; card manufacturing: the chip and antenna design in the card must also comply with the ISO14443 standard. The antenna must be able to effectively receive the RF energy emitted by the reader at a frequency of 13.56MHz and convert it into electrical energy for the chip to operate. At the same time, the chip must be able to send and receive data with the reader in accordance with the frame format and communication process specified in the protocol. Common Mifare series cards are manufactured strictly in accordance with the ISO14443 standard and are widely used in identity recognition, payment and other scenarios in many fields.

[0032] A one-time password, commonly known as an OTP, is generated based on time synchronization. This method generates a dynamically changing password based on time. The server and client (such as the mobile app used by the user) share a key and set the same time step (for example, 30 seconds or 60 seconds) and time synchronization mechanism in advance. The server generates a new OTP every time step based on the current time, key, and a specific algorithm. The client also generates the same OTP at the corresponding time based on the local time, shared key, and corresponding algorithm. As long as the client and server times remain basically synchronized, the OTP entered by the user can be verified by the server.

[0033] GPIO pins, or general-purpose input and output pins, are a very important type of interface pin in microcontrollers or embedded systems. GPIO pins offer flexible configuration capabilities. They can be configured as input pins to receive electrical signals from external devices or sensors, such as a level change signal generated by a button press or an analog or digital signal corresponding to the light intensity detected by an ambient light sensor. They can also be configured as output pins, outputting electrical signals to control other external devices, such as turning an LED on and off or driving a small motor. Through appropriate software programming, key characteristics of the GPIO pins, such as the operating mode (input / output mode, pull-up / pull-down resistor mode) and the level state (high or low), can be precisely set. Based on specific application requirements, programmers can use programming languages (such as C or Python, depending on the development platform used) combined with corresponding library functions or driver programs to operate the GPIO pins and make them function according to predetermined logic.

[0034] A radio frequency chip is an integrated circuit specifically used to process radio frequency signals. It plays a key role in modern wireless communication systems, providing devices with efficient wireless connection and data transmission functions. It is mainly responsible for receiving, amplifying, modulating or demodulating radio frequency signals; specifically, it modulates digital signals into analog radio frequency signals suitable for transmission in wireless channels, and demodulates received radio frequency signals into digital signals. At the same time, it also amplifies the signals to enhance signal quality and transmission distance. In the receiving mode, the antenna of the radio frequency chip receives the radio frequency signal and converts it into an electrical signal. After a series of filtering, amplification and other processing, the demodulator demodulates the radio frequency signal into a digital signal for subsequent digital signal processing units to process. In the transmitting mode, the modulator first modulates the digital signal into an analog radio frequency signal, then amplifies the signal through the power amplifier, and finally transmits the radio frequency signal through the antenna.

[0035] To sum up: the radio frequency signal smart card with key switch control and its control method, by pressing the key switch 4, the radio frequency chip 3 and the LED lamp post chip 5 form a path through the outer ring radio frequency antenna 2 and the inner ring radio frequency antenna 6, and the radio frequency chip 3 and the LED lamp post chip 5 are powered by the radio frequency field and the cooperation of the outer ring radio frequency antenna 2 and the inner ring radio frequency antenna 6 near the card reader. The pre-stored algorithm in the key switch 4 generates a one-time password and transmits it to the card reader to prevent unauthorized scanning; to combat relay attacks, the LED indicator light on the LED lamp post chip 5 indicates the transaction status, which is more intuitive to use and has a better experience. Active security control is achieved through a simple structure, which is simple and convenient, better than pure software encryption solutions, and compatible with the ISO14443 protocol. There is no need to modify the existing card reader equipment to achieve the purpose of controlling the on and off of the radio frequency signal of the smart card chip through the switch, thereby improving security, and passive power supply is achieved through the radio frequency power supply of the card reader.

[0036] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A radio frequency signal smart card with key switch control, characterized in that: The invention comprises a smart card body (1), wherein an outer ring radio frequency antenna (2), a radio frequency chip (3), a key switch (4), an LED lamp post chip (5) and an inner ring radio frequency antenna (6) are arranged in the smart card body (1); the outer ring radio frequency antenna (2) is arranged at the edge of the smart card body (1); the radio frequency chip (3) is arranged at a position slightly above the middle of the smart card body (1); the key switch (4) is arranged at the lower right corner of the smart card body (1); the LED lamp post chip (5) is arranged at a position slightly right in the middle of the smart card body (1); the inner ring radio frequency antenna (6) surrounds the outer side of the LED lamp post chip (5) and is located on the inner side of the outer ring radio frequency antenna (2); four GPIO pins are arranged on the key switch (4); the radio frequency chip (3) is connected to two GPIO pins on the right side of the key switch (4) through the outer ring radio frequency antenna (2); and the LED lamp post chip (5) is connected to two GPIO pins on the left side of the key switch (4) through the inner ring radio frequency antenna (6).

2. The radio frequency signal smart card with key switch control according to claim 1, characterized in that: The radio frequency chip (3) is an NFC chip.

3. The radio frequency signal smart card with key switch control according to claim 2, characterized in that: The key switch (4) is a type of machine key, membrane key, or combined tympanic membrane key switch.

4. The radio frequency signal smart card with key switch control according to claim 3, characterized in that: The radio frequency chip (3) and the LED lamp post chip (5) on the smart card body (1) are powered by the radio frequency field on the card reader via the outer ring radio frequency antenna (2) and the inner ring radio frequency antenna (6).

5. The radio frequency signal smart card with key switch control according to claim 4, characterized in that: The key switch (4) is directly connected in series to the inner ring radio frequency antenna (6) and the outer ring radio frequency antenna (2).

6. The radio frequency signal smart card with key switch control according to claim 5, characterized in that: The key switch (4) triggers the chip to generate a dynamic one-time password.

7. The radio frequency signal smart card with key switch control and the control method thereof according to claim 6, characterized in that: The key switch (4) is pre-set with an algorithm for implementing specific control logic and operation.

8. A control method for a radio frequency signal smart card with key switch control, applied to the radio frequency signal smart card with key switch control according to claim 7, characterized in that: The control method is as follows: The user presses the key switch (4), so that the radio frequency chip (3) and the LED lamp post chip (5) are connected through the outer ring radio frequency antenna (2) and the inner ring radio frequency antenna (6), respectively. Then the user approaches the card reader, and the radio frequency chip (3) and the LED lamp post chip (5) are powered by the cooperation of the radio frequency field of the card reader and the outer ring radio frequency antenna (2) and the inner ring radio frequency antenna (6). The radio frequency chip (3) and the LED lamp post chip (5) generate a one-time password through the pre-stored algorithm in the key switch (4), and send the one-time password to the card reader through the outer ring radio frequency antenna (2) and the inner ring radio frequency antenna (6); during this period, the card responds to the card reader signal so that the LED indicator on the LED lamp post chip (5) lights up. During use, security is improved, unauthorized scanning is prevented, and relay attacks are resisted. No screen and complex circuits are required, the cost is low, one-button operation is carried out, and it is compatible with existing RFID card reading equipment.

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