CN217543839U - External software login verification encryption circuit - Google Patents

Abstract

The utility model provides an encryption circuit is verified in external software login. The encryption circuit uses a USB interface to carry out data communication with a computer and provides 5V power supply for a system, the 5V power enters a voltage reduction chip AMS1117-3.3 from the USB interface, 3.3V of the voltage is supplied to a main control chip STM32U575CI and an encryption chip ATSHA204A, and the ATSHA204A communicates with the main control chip through an IIC interface. The method comprises the following steps: the system comprises a main control chip, a crystal oscillator driving capacitor, a crystal oscillator circuit resistor, a reset circuit capacitor, a reset circuit resistor, an IIC bus pull-up resistor, an ATSHA204A encryption chip, an LED current-limiting resistor, a system LED lamp, an AMS1117-3.3 voltage reduction chip, a USB interface protection chip, a pull-up resistor, a USB interface, a power supply filter capacitor and a BOOT0 pull-down resistor. The login authentication of common software can be realized, the internal important data of the software can be effectively protected, and whether the software runs on an authenticated computer or not can be confirmed.

Description

An external software login verification encryption circuit

technical field

The utility model relates to an external software login verification and encryption circuit, which belongs to the technical field of modern software data security protection.

Background technique

With the increasing number and complexity of software functions and their application scenarios, many softwares involve some data with higher security levels. Accounts and may be sniffed or intercepted at any time. In order to prevent account theft and software data theft incidents, a hardware encryption device is used for login verification. Even if the account data is stolen, it is difficult to achieve remote software login and operate the current machine in the background without a hardware encryption device. Log in. The traditional software account login verification has the risk of account loss or theft, resulting in the loss of important data or property. The external encryption device can play an authentication role in the software login process. After the login authentication is completed, the encryption device will not be repeated. Work.

Utility model content

The purpose of the utility model is to provide an external software login verification encryption circuit, which can realize the login authentication of common software, effectively protect the important data inside the software and confirm whether the software is running on an authenticated computer.

In order to realize the above-mentioned purpose, the present utility model realizes through the following technical solutions:

An external software login verification encryption circuit is characterized in that it includes a main control chip, a crystal oscillator drive capacitor, a crystal oscillator, a crystal oscillator circuit resistor, a reset circuit capacitor, a reset circuit resistor, an IIC bus pull-up resistor, an encryption chip, and an LED current limiting resistor. , System LED lights, step-down chip, USB interface protection chip, pull-up resistor, USB interface, power filter capacitor, BOOT pull-down resistor;

The VDD power pins in the main control chip are all connected to the capacitor and then grounded. The PA11 and PA12 pins of the main control chip are connected to the USB interface through the USB interface protection chip, and the PB15 pin is connected to the system function indicator LED light, BOOT0 The pin is grounded through the BOOT0 pull-down resistor;

The pin NRST pin of the main control chip is connected with one end of the reset circuit capacitor and the reset circuit resistor, and the other end of the reset circuit capacitor is grounded;

The OSC_IN and OSC_OUT pins of the main control chip are connected with the crystal oscillator circuit, the OSC_IN pin is connected with the No. 2 pin of the crystal oscillator, the OSC_OUT pin is connected with one end of the crystal oscillator circuit resistance, and the other end of the resistance is connected with the crystal oscillator, The No. 1 and No. 2 pins of the crystal oscillator are also connected to the ground after the crystal oscillator drive capacitor; connect;

The encryption chip performs data communication with the main control chip through the IIC bus, the SDA pin of the encryption chip is connected with the PB9 pin of the main control chip, the SCL pin is connected with the PB8 pin of the main control chip, and two lines of the IIC are connected. There are also pull-up resistors connected.

Preferably, the number pin and the number pin of the USB interface protection chip are respectively connected to the PA11 and PA12 pins of the main control chip, wherein the model of the USB protection chip is USBLC6_2SC6.

Preferably, one end of the system indicating LED light is grounded, and the other end is connected to the PA15 pin of the main control chip through the LED current limiting resistor.

Preferably, the model of the encryption chip is ATSHA204A, and the model of the main control chip is STM32U575CI.

The utility model has the advantages that the application can realize the login authentication of common software through the secure main control chip and the encryption chip, effectively protect the important data in the software and confirm whether the software runs on the authenticated computer. It provides effective solutions for intellectual property protection and data security.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention.

FIG. 1 is a schematic diagram of the circuit structure of the utility model.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

This patent provides an external software login verification encryption circuit.

The encryption circuit uses the USB interface for data communication with the computer, and provides 5V power supply for the system. The 5V power supply enters the step-down chip AMS1117-3.3 from the USB interface, and the voltage will be 3.3V for the main control chip STM32U575CI and encryption chip ATSHA204A use, and ATSHA204A communicates with the main control chip through the IIC interface.

As shown in the attached drawings: an external software login verification encryption circuit, including: main control chip 1, crystal oscillator drive capacitor 2, crystal oscillator 3, crystal oscillator circuit resistor 4, reset circuit capacitor 5, reset circuit resistor 6, IIC bus pull-up Resistor 7, ATSHA204A encryption chip 8, LED current limiting resistor 9, system LED light 10, AMS1117-3.3 step-down chip 11, USB interface protection chip 12, pull-up resistor 13, USB interface 14, power filter capacitor 15, BOOT0 pull-down resistor 16.

1) Power circuit design:

The encryption circuit uses the USB interface 14 to provide 5V power supply for the system, the 1 pin of the USB interface 14 is the input pin of the 5V power supply, and the 1 pin is connected to the power input 3 pin of the AMS1117-3.3 step-down chip 11 through the drop. After pressing the chip, output 3.3V voltage at pin 2, pin 1 of AMS1117-3.3 step-down chip 11 is connected to the system power GND, and the voltage input and output terminals of AMS1117-3.3 step-down chip 11 are connected to power supply filter capacitors 15 pairs of power high-frequency interference signals in the filter.

2) The connection method between the main control chip and each functional module:

The model of the main control chip 1 is STM32U575CI, which can realize the low power consumption of the system and the security management of the program. All the VDD power pins in the main control chip 1 use 104 capacitors for decoupling. The 32nd and 33rd pins of the main control chip 1 are connected to the USB interface through the USB interface protection chip, and the 28th pin PA15 is connected to the system function indicator LED. This circuit uses an external 8M crystal oscillator to provide a clock source for the system, and the seventh pin of the main control chip 1 is connected to the system power-on reset circuit. The 44th pin of the main control chip 1 is the boot mode selection pin of the BOOT0 microcontroller. It is connected to GND through the BOOT0 pull-down resistor 16 to ensure that the system starts from FLASH.

3) Reset circuit:

Considering the function and size of the encryption circuit PCB board, the power-on reset circuit is selected, and the common button reset circuit is cancelled. The 7-pin NRST of the main control chip 1 is connected to one end of the reset circuit capacitor 5 and the reset circuit resistor 6. , the reset circuit resistor 6 ensures that the NRST pin is at a high level during normal operation of the system, and the reset circuit capacitor 5 ensures that the NRST pin is at a low level when the system is powered on, triggering a system reset.

4) External crystal oscillator circuit:

The encryption circuit uses an 8M passive crystal oscillator to provide a clock source for the system, the 5th and 6th pins of the main control chip 1 are connected to the crystal oscillator circuit, the 5th pin is connected to the 2nd pin of the crystal oscillator 3, and the 6th pin is connected to the crystal oscillator. One end of the circuit resistor 4 is connected to the crystal oscillator 3, and the other end of the resistor 4 is connected to the crystal oscillator 3 to prevent over-driving of the crystal oscillator. The crystal oscillator drive capacitor 2 is used to drive the crystal oscillator 3 to start vibrating.

5) USB interface circuit:

The encryption circuit communicates data with the computer through the USB interface 14. The 2-pin and the 3-pin of the USB interface 14 are respectively connected to the 4-pin and the 6-pin of the USB electrostatic protection chip 12. The USB interface protection chip 12 The 1 and 3 pins of the main control chip 1 are respectively connected to the 33-pin USB_DP and 34-pin USB_DM of the main control chip 1. The model of the USB protection chip 12 is USBLC6_2SC6, which is a dedicated protection chip for the USB interface.

6) System indicator circuit:

The system indicating LED light 10 is used to indicate the normal working state of the system.

The system indicates that one end of the LED10 is connected to GND, and the other end is connected to the 28th pin PA15 of the main control chip 1 through the LED current limiting resistor 9 .

7) Encryption chip circuit:

The encryption chip model of the encryption circuit is ATSHA204A, the encryption chip 8 carries out data communication with the main control chip 1 through the IIC bus, and the 5th and 6th pins of the encryption chip 8 are respectively on the 46th and 45th pins of the main control chip 1. Connect, and need to achieve high level in the communication process through pull-up resistor 7 on the two lines of IIC.

Claims (4)

1. An external software login verification encryption circuit is characterized by comprising a main control chip (1), a crystal oscillator driving capacitor (2), a crystal oscillator (3), a crystal oscillator circuit resistor (4), a reset circuit capacitor (5), a reset circuit resistor (6), an IIC bus pull-up resistor (7), an encryption chip (8), an LED current-limiting resistor (9), a system indication LED lamp (10), a voltage reduction chip (11), a USB interface protection chip (12), a pull-up resistor (13), a USB interface (14), a power supply filtering capacitor (15) and a BOOT0 pull-down resistor (16);

VDD power supply pins in the main control chip (1) are all grounded after being connected to a 104 capacitor, pins PA11 and PA12 of the main control chip (1) are connected with a USB interface through a USB interface protection chip, a PB15 pin is connected to a system function indication LED lamp, and a BOOT0 pin is grounded through a BOOT0 pull-down resistor (16);

a pin NRST of the main control chip (1) is connected with one end of a reset circuit capacitor (5) and one end of a reset circuit resistor (6), and the other end of the reset circuit capacitor (5) is grounded;

OSC _ IN and OSC _ OUT pins of the main control chip (1) are connected with a crystal oscillator circuit, the OSC _ IN pin is connected with a No. 2 pin of a crystal oscillator (3), the OSC _ OUT pin is connected with one end of a resistor (4) of the crystal oscillator circuit, the other end of the resistor (4) is connected with the crystal oscillator (3), and the No. 1 and No. 2 pins of the crystal oscillator (3) are grounded after being connected with a crystal oscillator driving capacitor (2); a D-pin and a D + pin of the USB interface (14) are respectively connected with an I/O2 pin and an I/O1 pin of the USB interface protection chip (12);

encrypt chip (8) and carry out data communication through IIC bus and main control chip (1), the SDA pin of encrypting chip (8) is connected with the PB9 pin of main control chip (1), and the SCL pin is connected with the PB8 pin of main control chip (1) to still be connected with IIC bus pull-up resistance (7) at two lines of IIC.

2. The external software login authentication encryption circuit according to claim 1, wherein the pin 1 and the pin 3 of the USB interface protection chip (12) are respectively connected to the pins PA11 and PA12 of the main control chip (1), and the USB interface protection chip (12) has a model number of USBLC6_2SC6.

3. The external software login verification encryption circuit as claimed in claim 1, wherein one end of the system indication LED lamp (10) is grounded, and the other end is connected with a PA15 pin of the main control chip (1) through an LED current limiting resistor (9).

4. The external software login authentication encryption circuit of claim 1, wherein the type of the encryption chip (8) is ATSHA204A, and the type of the main control chip (1) is STM32U575CI.

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