CN218633969U - NFC encryption device - Google Patents

Abstract

The application relates to the technical field of data security transmission, in particular to an NFC encryption device. The device comprises a microcontroller, an NFC driving circuit, an NFC Bluetooth communication circuit, an encryption/decryption logic circuit, an external keyboard and a USB interface; the input end of the microcontroller is respectively connected with the signal input end of the USB interface and the output end of the external keyboard; the output end of the microcontroller is connected with the signal input end of the NFC driving circuit and the input end of the encryption/decryption logic circuit; the NFC driving circuit is connected with the NFC Bluetooth communication circuit. The NFC encryption device is internally provided with the encryption/decryption logic circuit in a hardware form, and can modify, encode and decode the secret key in an online or offline mode through a USB interface and a keyboard, so that the operability is greatly improved.

Description

NFC encryption device

Technical Field

The application relates to the technical field of data security transmission, in particular to an NFC encryption device.

Background

Near Field Communication (NFC), which is a short-range high-frequency wireless Communication technology, devices using the NFC technology can exchange data when they are close to each other, and is integrated and evolved from a non-contact radio frequency identification and interconnection technology, and by integrating functions of an induction card reader, an induction card and point-to-point Communication on a single chip, applications such as mobile payment, electronic ticketing, door access control, mobile identity identification, anti-counterfeiting and the like are implemented by using a mobile terminal.

At present, the traditional NFC has the defects of single and fixed secret key, incapability of customizing modification and offline change, poor operability, inconvenience in use and incapability of meeting different product requirements.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present application is to provide an NFC encryption device, which can modify, encode and decode a secret key online or offline through a USB interface and a keyboard, thereby greatly improving operability.

In a first aspect, an embodiment of the present application provides an NFC encryption device, where the device includes a microcontroller, an NFC driving circuit, an NFC bluetooth communication circuit, an encryption/decryption logic circuit, an external keyboard, and a USB interface; the input end of the microcontroller is respectively connected with the signal input end of the USB interface and the output end of the external keyboard; the output end of the microcontroller is connected with the signal input end of the NFC driving circuit and the input end of the encryption/decryption logic circuit; the NFC driving circuit is connected with the NFC Bluetooth communication circuit.

Therefore, the NFC encryption device provided in the embodiment of the present application, because the encryption/decryption logic circuit is provided in a hardware form, can greatly reduce transmission delay caused by software encryption and decryption, thereby improving data transmission efficiency. In addition, the NFC encryption device provided by the embodiment of the application is also provided with a USB interface and an external keyboard, so that the keys can be modified, coded and decoded online or offline in two modes of the USB interface and the keyboard, and the operability is greatly improved.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, where the apparatus further includes an NFC antenna; the NFC antenna is connected with the output end of the NFC driving circuit.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, where the NFC antenna includes a low-frequency antenna and a medium-frequency antenna; the NFC antenna is composed of a high-precision antenna and an amplifying circuit.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, and the apparatus further includes a battery pack; the battery pack supplies power to the USB interface and the microcontroller.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, and the apparatus further includes an LED lamp; the LED lamp is connected with the output end of the microcontroller.

In combination with the first aspect, the present application provides a possible implementation manner of the first aspect, where the microcontroller includes an M032SE3AE chip and a peripheral circuit of the M032SE3AE chip.

With reference to the first aspect, this embodiment provides a possible implementation manner of the first aspect, where the NFC driving circuit includes an ST25R3912 chip and a peripheral circuit of the ST25R3912 chip.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, where the encryption/decryption logic circuit includes an M251LE3AE chip and a peripheral circuit of the M251LE3AE chip.

Therefore, the standby time of the NFC encryption device can be prolonged by selecting the M251LE3AE chip with low power consumption.

With reference to the first aspect, an embodiment of the present application provides a possible implementation manner of the first aspect, where the NFC bluetooth communication circuit includes a TLSR8251 chip and a peripheral circuit of the TLSR8251 chip.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an NFC encryption device according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of an NFC encryption device according to an embodiment of the present invention.

Icon: 10-NFC encryption means; 100-a microcontroller; 200-an NFC driver circuit; 300-NFC bluetooth communications circuitry; 400-encryption/decryption logic; 500-external keyboard; 600-a USB interface; 700-a battery pack; 800-LED lamp.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and for simplicity of description, and do not indicate or imply that the equipment or components that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The key of the traditional NFC is single and fixed, cannot be customized to modify and offline to change, is poor in operability, is inconvenient to use, and cannot meet different product requirements.

The embodiment of the application provides an NFC encryption device. The device comprises a microcontroller, an NFC driving circuit, an NFC Bluetooth communication circuit, an encryption/decryption logic circuit, an external keyboard and a USB interface; the input end of the microcontroller is respectively connected with the signal input end of the USB interface and the output end of the external keyboard; the output end of the microcontroller is connected with the signal input end of the NFC driving circuit and the input end of the encryption/decryption logic circuit; the NFC driving circuit is connected with the NFC Bluetooth communication circuit. The NFC encryption device is internally provided with the encryption/decryption logic circuit in a hardware form, and can modify, encode and decode the secret key in an online or offline mode through a USB interface and a keyboard, so that the operability is greatly improved.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an NFC encryption device 10 according to the present embodiment; as shown in fig. 1, the present embodiment provides an NFC encryption device 10 including: microcontroller 100, NFC drive circuit 200, NFC bluetooth communication circuit 300, encryption/decryption logic circuit 400, external keyboard 500, USB interface 600. Wherein, the input end of the microcontroller 100 is respectively connected with the signal input end of the USB interface 600 and the output end of the external keyboard 500; the output end of the microcontroller 100 is connected to the signal input end of the NFC driving circuit 200 and the input end of the encryption/decryption logic circuit 400; the NFC driving circuit 200 is connected to the NFC bluetooth communication circuit 300.

It should be noted that the NFC encryption device 10 provided in the embodiment of the present application may be used for authenticating a user or a transaction in an electronic banking business. The NFC encryption device 10 may have a simple user interface, and may be connected to a personal computer typically through the USB interface 600, or the NFC encryption device 10 may be powered through the USB interface 600.

It should be noted that, a Microcontroller 100 (MCU), also called a single-chip microcomputer or a single-chip microcomputer, properly reduces the frequency and specification of a CPU, and integrates a memory, a counter, a USB, an a/D conversion, a UART, a PLC, a DMA, and other peripheral interfaces, even an LCD driving circuit, into a single chip to form a chip-level computer, which is used for different applications and is controlled in different combinations.

Here, for the present embodiment, the microcontroller 100 is a host controller of the NFC encryption device 10, and is provided in the NFC encryption device 10 in the form of an MCU control board. Specifically, the microcontroller 100 is connected to the USB interface 600 and the NFC driving circuit 200 in a communication bridge form, the microcontroller 100 may receive data information read by the NFC driving circuit 200 from an external device, process the data information, and send the processed data information to the encryption/decryption logic circuit 400, and after the encryption/decryption logic circuit 400 decodes the data information in real time, the microcontroller 100 transmits the decoded data information to the PC through the USB interface 600, so that the data information may be stored, modified, and copied.

In an alternative embodiment, the microcontroller 100 includes an M032SE3AE chip and peripheral circuits of the M032SE3AE chip.

The M032SE3AE chip is based on

A low operating voltage microcontroller 100 of the M0 core with a 32-bit hardware multiplier/divider. The operating frequency is up to 48MHz, the working voltage is 1.8-3.6V, and a 128KB Flash and a 16KB SRAM are provided. By virtue of the specially designed performance of the universal serial bus interface, such as 2MSPS ADC,96MHz PWM,24MHz SPI and 6MHz UART. It can be used in industrial control and consumer applications to allow for fast and accurate conversion of voltage, current and sensor data, and fast response and control of external modules, such as current or voltage feedback from motor control or sensing devices. The M032SE3AE also provides a large number of peripheral devices, namely peripheral circuits, which comprise 1 group of Universal Serial Control Interfaces (USCI), 3 groups of UARTs, 1 group of SPI/I2S, 2 groups of I2C, 16 paths of 12-bit ADCs, 12 paths of 16-bit PWMs and the like, and can meet various application requirements. It can work in a wide temperature range of-40 deg.C to +105 deg.C. The full family of identical packages Pin to Pin are compatible. The device can be applied to various fields, such as laser range finders, air detectors/cleaners, liquid crystal panel controllers, micro printers, WPC wireless chargers and the like.

Here, in the embodiment of the present application, an M032SE3AE chip with low power consumption and high performance is selected as the host controller (i.e., the microcontroller 100) of the NFC encryption device 10, so that the standby time of the NFC encryption device 10 can be greatly prolonged.

It should be noted that the NFC driving circuit 200 in this embodiment is an NFC reader, and the NFC driving circuit 200 is connected to the microcontroller 100 and the NFC bluetooth communication circuit 300 respectively. The NFC reader communicates with an external device through the NFC bluetooth communication circuit 300, and can be connected to a card (payment card ) through a mobile terminal, so as to quickly read information in the card, help a user to backup data, prevent the card from being lost, and perform decryption of the card and protection and read-write work of the data anytime and anywhere.

In addition, the scanning mode of the NFC driving circuit 200 is uninterrupted polling, when an NFC device (for example, a mobile terminal) approaches, the NFC driving circuit 200 reads basic information of the NFC device through polling, including a device ID and the like, and then transmits the read ID data to the microcontroller 100 for processing, and determines the device type and the encryption mode through the device ID, and tries to communicate through a preset general key. In order to ensure the power consumption of the device, after the long polling is not answered, the chip automatically enters a sleep state, and after the sleep state, the NFC encryption device 10 may be accessed through the external keyboard 500 or the USB interface 600 to wake up again to enter a normal working state.

In an alternative embodiment, the NFC driver circuit 200 includes an ST25R3912 chip and peripheral circuits of the ST25R3912 chip.

Here, the ST25R3912 chip (NFC/HF RFID reader IC) is a highly integrated NFC initiator/HF reader IC, including an Analog Front End (AFE) and a highly integrated data frame system for ISO 18092 (NFCIP-1) initiator, ISO 18092, NFCIP-2 active target, ISO 14443A and B readers (including high bit rates), ISO 15693 reader, and FeliCa reader IC ^TM Readers implement other standard and custom protocols, e.g. MIFARE ^TM Classic, low power chips can be implemented using AFE and implementing frames (streaming and transparent modes) in external microcontroller 100. According to the NFC encryption device, the ST25R3912 chip with the low power consumption property is selected to serve as the NFC driving circuit 200, the low power consumption chip is benefited, the power consumption in the sleep state is extremely low, and the long-time standby of the NFC encryption device 10 is guaranteed.

It should be noted that the NFC bluetooth communication circuit 300 is connected to the NFC driving circuit 200, and the NFC bluetooth communication circuit 300 can ensure that the NFC driving circuit 200 communicates with an NFC device (for example, a mobile terminal with an NFC function).

In an optional embodiment, the NFC bluetooth communication circuit 300 includes a TLSR8251 chip and peripheral circuits of the TLSR8251 chip.

Here, the first and second liquid crystal display panels are,the TLSR8251 chip is a Bluetooth low-power chip and can be configured through software. Bluetooth Low Energy (BLE), also known as BLUETOOTH

Smart, TLSR8251 chip is Bluetooth LE + IEEE802.15.4 multi-standard wireless SoC solution developed by Telink with built-in flash memory and audio support. It completely meets RoHS standard and is 100% lead-free. The TLSR8251 combines Radio Frequency (RF), digital processing, protocol stack software and profiles of the bluetooth low energy (bluetooth 5.0), BLE Mesh and 2.4GHz proprietary standards into a single SoC.

It should be noted that the encryption/decryption logic circuit 400 is connected to the microcontroller 100, and is used for encoding/decoding, i.e., encrypting/decrypting, data information output by the microcontroller 100. The NFC encryption device 10 provided in the embodiment of the present application is provided with the encryption/decryption logic circuit 400 in a hardware form, so that transmission delay caused by software encryption and decryption can be greatly reduced, and thus data transmission efficiency is improved.

In an alternative embodiment, the encryption/decryption logic 400 includes an M251LE3AE chip and peripheral circuitry of the M251LE3AE chip.

Here, the M252LE3AE chip is a Secure Element (Secure Element), and is generally provided in a chip form. In order to prevent external malicious analysis attacks and protect data security, an encryption/decryption logic circuit 400 is arranged in a chip. The M251LE3AE chip is particularly low in power consumption and hardware encryption support, transmission delay caused by software encryption and decryption is reduced, transmitted data are communicated with the microcontroller 100M032SE3AE chip through a serial port, the NFC driving circuit 200 is driven to generate corresponding signals, and the signals are communicated with external equipment.

Here, an external keyboard 500 provided on the NFC encryption device 10 is connected to the microcontroller 100, wherein different keyboard inputs may correspond to predefined different commands. The keys of the external keyboard 500 can be designed and arranged to be 4*6, so that the functions of digital input and partial English input can be provided, the hexadecimal requirement of the NFC key is met, and the diversity of key setting is improved. The key can be changed through the external keyboard 500, and the operability of the user is greatly improved.

It should be further noted that, the NFC encryption device 10 provided in the embodiment of the present application includes the USB interface 600, one end of the USB interface 600 is connected to the input end of the microcontroller, and the other end of the USB is connected to the PC end, so that NFC encryption control based on USB communication can be implemented. In addition, the USB interface 600 may be connected to a power supply device, so that the NFC encryption device 10 may be powered through the USB interface 600.

Here, the NFC encryption device 10 provided in the embodiment of the present application can modify and encode and decode the secret key online or offline through the USB interface 600 and the keyboard by setting the USB interface 600 and the external keyboard 500, so that the operability and convenience are greatly improved, and various product requirements can be met.

The working principle of the NFC encryption device 10 provided in the embodiment of the present application is explained below, specifically, the NFC driving circuit 200 is responsible for performing read communication on an external device having an NFC function, and transmitting data to the microcontroller 100 through a serial port for processing, the encryption/decryption logic circuit 400 may implement real-time decoding on the data, and the decoded data may be transmitted to a PC terminal through the USB interface 600 to provide functions such as storage, modification, and copying.

The NFC encryption device 10 provided in the embodiment of the present application includes a microcontroller 100, an NFC driving circuit 200, an NFC bluetooth communication circuit 300, an encryption/decryption logic circuit 400, an external keyboard 500, and a USB interface 600; wherein, the input end of the microcontroller 100 is respectively connected with the signal input end of the USB interface 600 and the output end of the external keyboard 500; the output end of the microcontroller 100 is connected to the signal input end of the NFC driving circuit 200 and the input end of the encryption/decryption logic circuit 400; the NFC driving circuit 200 is connected to the NFC bluetooth communication circuit 300. The NFC encryption device 10 provided by the present application is internally provided with the encryption/decryption logic circuit 400 in a hardware form, and can modify, encode and decode the secret key in an online or offline manner through the USB interface 600 and the keyboard, thereby greatly improving operability.

Referring to fig. 2, fig. 2 is a second schematic structural diagram of an NFC encryption device 10 according to the present embodiment; as shown in fig. 2, the NFC encryption device 10 includes a microcontroller 100, an NFC driving circuit 200, an NFC bluetooth communication circuit 300, an encryption/decryption logic circuit 400, an external keyboard 500, a USB interface 600, and an NFC antenna (not shown in the figure); wherein, the input end of the microcontroller 100 is respectively connected with the signal input end of the USB interface 600 and the output end of the external keyboard 500; the output end of the microcontroller 100 is connected to the signal input end of the NFC driving circuit 200 and the input end of the encryption/decryption logic circuit 400; the NFC driving circuit 200 is connected to the NFC bluetooth communication circuit 300; the NFC antenna is connected to an output terminal of the NFC driving circuit 200.

It should be noted that the NFC antenna is designed and manufactured successfully by using an RFID radio frequency identification technology, using transformer co-coupling matching as a hardware processing scheme for communication, completing verification of a data transmission process through a communication instruction of a processor, performing RFID modulation processing on a software and hardware environment, and adjusting a matching circuit.

In one possible embodiment, the NFC antenna comprises a low frequency antenna and a medium frequency antenna; the NFC antenna is composed of a high-precision antenna and an amplifying circuit.

Preferably, the NFC radio frequency is arranged to be a low-frequency antenna and an intermediate-frequency antenna, wherein the antenna is composed of a high-precision antenna and an amplifying circuit.

In a preferred embodiment, as shown in fig. 2, the NFC encryption device 10 further includes a battery pack 700; wherein the battery pack 700 supplies power to the USB interface 600 and the microcontroller 100.

It should be noted that the NFC encryption device 10 provided in the embodiment of the present application further includes a battery pack 700, and the battery pack 700 is connected to the microcontroller 100 and the USB interface 600 respectively.

Here, the power supply circuit, the switch key and the Micro USB charging wire of the M032SE3AE chip integrated battery Low Dropout Regulator (LDO) system are integrated into one.

In addition, NFC encryption device 10 that this application provided passes through serial ports connection M251LE3AE chip serial ports communication port and passes through the unified power supply of LDO, and for guaranteeing waterproofly, the mainboard dress of battery and M251LE3AE chip is in plastic housing and is beaten and glue the processing.

In a preferred embodiment, as shown in fig. 2, the NFC encryption device 10 further includes an LED lamp 800, and the LED lamp 800 is connected to an output terminal of the microcontroller 100.

The LED lamp 800 may be a light-emitting diode (LED). Specifically, the scanning mode of the NFC driving circuit 200 is uninterrupted polling, when an NFC device approaches, the NFC driving circuit 200 reads device basic information including a device ID and the like by polling, and then transmits the read ID data to the microcontroller 100, such as an M032SE3AE chip, for processing, and determines the device type and the encryption mode by the device ID, and tries communication by a preset general key, the key is correct, the LED lamp 800 displays green and the key is wrong, and the LED lamp 800 displays red to prompt a user to input a correct key by a keyboard.

The working principle of the NFC encryption device 10 provided in the embodiment of the present application is explained below, specifically, the NFC driving circuit 200 is responsible for reading and communicating external devices with NFC function, and transmitting data to the M032SE3AE chip for processing through a serial port, the M251LE3AE chip can realize real-time decoding of data, and the decoded data can be transmitted to a PC end through the USB interface 600, so as to provide functions of storage, modification, copy, and the like.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An NFC encryption device is characterized by comprising a microcontroller, an NFC driving circuit, an NFC Bluetooth communication circuit, an encryption/decryption logic circuit, an external keyboard and a USB interface; the input end of the microcontroller is respectively connected with the signal input end of the USB interface and the output end of the external keyboard; the output end of the microcontroller is connected with the signal input end of the NFC driving circuit and the input end of the encryption/decryption logic circuit; the NFC driving circuit is connected with the NFC Bluetooth communication circuit.

2. The NFC encryption device of claim 1, wherein the device further comprises an NFC antenna; the NFC antenna is connected with the output end of the NFC driving circuit.

3. The NFC encryption device of claim 2 wherein the NFC antenna comprises a low frequency antenna and a medium frequency antenna; the NFC antenna is composed of a high-precision antenna and an amplifying circuit.

4. The NFC encryption device of claim 1 wherein the device further comprises a battery pack; the battery pack supplies power to the USB interface and the microcontroller.

5. The NFC encryption device of claim 1 further comprising an LED light; the LED lamp is connected with the output end of the microcontroller.

6. The NFC encryption device of claim 1, wherein the microcontroller comprises an M032SE3AE chip and peripheral circuits of the M032SE3AE chip.

7. The NFC encryption device according to claim 1, wherein the NFC driving circuit includes an ST25R3912 chip and a peripheral circuit of the ST25R3912 chip.

8. The NFC encryption device of claim 1 wherein the encryption/decryption logic includes an M251LE3AE chip and peripheral circuitry of the M251LE3AE chip.

9. The NFC encryption device of claim 1 wherein the NFC bluetooth communication circuitry comprises a TLSR8251 chip and peripheral circuitry of the TLSR8251 chip.

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