A universal interface adaptive method and security authentication system based on magnetic attraction connection

Abstract

The present application relates to computer peripheral technology field, and disclose a kind of general interface adaptive method based on magnetic attraction connection, the adaptive method includes the following steps: S1, base interface standardization mapping;S2, no direction magnetic attraction coupling conduction;S3, single protocol analysis and device enumeration;S4, magnetic attraction disconnect and power-off self-clearing zero protection;S5, magnetic field isolation protection.The present application is by adapter base USB-A or USB-C interface signal pin is uniformly mapped to VCC, GND, D+, D- four standardization lines, and in USB-C base inside by pull-down resistance processing CC pin configuration, so that the electrical signal received by safety main body always complies with standard USB 2.0 electrical specification, using USB-C to USB 2.0 native compatibility, without identifying base type can complete device enumeration and data interaction, reaches without identifying base interface type can be compatible USB-A / USB-C terminal, realizes the beneficial effects of single safety main body full-scene adaptation.

Description

Technical Field

[0001] This invention relates to the field of computer peripheral technology, specifically to a universal interface adaptive method and security authentication system based on magnetic connection. Background Technology

[0002] Existing hardware encryption devices such as USB keys, U-shields, and dongles are widely used in high-security scenarios such as finance, government affairs, and enterprise offices, but they have the following drawbacks: Interface compatibility limitations: It uses a single fixed interface (USB-A, USB-C, etc.), and multiple devices or adapters are required for cross-terminal use, which is costly and cumbersome to manage.

[0003] Insufficient physical connection reliability: Traditional plug-in structures are prone to solder joint detachment, interface deformation, and device breakage when subjected to external force; repeated plugging and unplugging over a long period of time will continuously wear down the metal contacts, shortening the service life of the device and host port.

[0004] Poor connection experience: Traditional interfaces have directional limitations, making blind insertion difficult and resulting in low operating efficiency in dim, narrow, and cable-intensive environments. Summary of the Invention

[0005] Technical problems to be solved: To address the shortcomings of existing technologies, this invention provides a universal interface adaptive method and security authentication system based on magnetic connection. It has the advantages of being compatible with USB-A / USB-C terminals without needing to identify the base interface type, achieving full-scenario adaptation of a single security subject, optimizing the magnetic disconnection security protection logic, and eliminating the magnetic security risks of magnetic encryption devices, thus solving the aforementioned technical problems.

[0006] Technical solution: To achieve the above objectives, the present invention provides the following technical solution: a universal interface adaptive method based on magnetic connection, comprising an adapter base and a security body, wherein one end of the adapter base is configured as a USB-A or USB-C male connector, and the other end is provided with magnetic contacts; the security body has a built-in security chip and storage module, and the mating end is provided with magnetic contacts that match the base; the adaptive method includes the following steps: S1, Standardized Mapping of Base Interface: The signal pins of the USB-A or USB-C interface on the adapter base are uniformly mapped to the four standardized lines inside the base: VCC, GND, D+ and D-. S2, Non-directional magnetic coupling conduction: When the safety body is brought close to the adapter base, it automatically adsorbs and aligns using the vertical symmetrical magnetic attraction structure set on the mating surface between the base and the safety body; S3, Single Protocol Parsing and Device Enumeration: After the security subject is powered on, its internal main control unit uses the USB-A standard protocol to parse and process the D+ and D- differential signals. It does not interact with the adapter base in terms of interface type and does not switch the communication protocol. S4. Magnetic disconnection and power failure self-clearing protection: During data transmission or encryption operations, when the security subject is magnetically separated from the adapter base due to external force, a hardware-level security protection mechanism is triggered. S5. Magnetic field isolation protection: During the operation of the above steps, a physical isolation mechanism is used to prevent magnetic fields from interfering with data storage.

[0007] VCC is the power supply line, GND is the ground line, D+ is the positive data line, and D- is the negative data line.

[0008] A universal interface security authentication system based on magnetic connection, the system includes an adapter base and a security body, wherein the adapter base and the security body are physically separate and detachable structures; The adapter base includes: A universal interface module; the universal interface module is configured with a USB-A male connector or a USB-C male connector to adapt to the corresponding interface of the host terminal. Base contact module; the base contact module is located on the mating end face of the adapter base and includes four conductive contacts: VCC power supply contact, GND ground contact, D+ data contact, and D- data contact, which are vertically symmetrically distributed. Magnetic coupling module; The magnetic coupling module is embedded around the base contact module and uses soft magnetic material with a ring-shaped symmetrical layout. It is used to magnetically align with the safety body and provide an attraction force of 2~3kg. When the external force exceeds the tripping threshold, it automatically separates from the safety body. Internal wiring of the base: The internal wiring of the base only includes four standardized lines, VCC, GND, D+, and D-, which connect the general interface module and the base contact module. There are no interface type identification circuits, coding resistors, or additional characteristic signal lines. The security entity includes: Main contact module; The main contact module is located on the docking end face of the safety body and matches one by one with the four contacts of the base contact module to establish a physical path for power and data after magnetic adsorption. Main control unit; The main control unit is electrically connected to the security chip, and uses the USB-A standard protocol to analyze and process the D+ and D- differential signals. It does not interact with the adapter base through the interface type and does not switch the communication protocol. Security chip; The security chip has a built-in encryption operation engine and non-volatile flash memory storage. The non-volatile flash memory storage is used to store permanent keys, digital certificates and firmware. The security chip is equipped with hardware session locking logic to block incomplete signing, encryption or authentication sessions when power is off. Volatile storage module; The volatile storage module is implemented using RAM and is used to store session cache, temporary session keys and intermediate values ​​for encryption operations. After power failure, the stored charge dissipates instantly and completes automatic zeroing and initialization. When the security unit and the adapter base are magnetically attached, the four wires VCC, GND, D+, and D- are conductive, and the main control unit reports a standard USB encrypted device descriptor to the host to complete identity authentication, digital signature, or encryption operations. When the magnetic attachment is removed, the security unit is momentarily powered off, the volatile storage module data is automatically lost, the security chip triggers a hardware session lock, and the RAM completes a zeroing initialization. The adapter base is a passive component, which contains only physical wiring and magnetic components, and does not contain any protocol conversion chip, identification circuit or security chip. The security entity is an independent security container, which integrates a security chip and RAM. The security chip is equipped with a hardware session latch triggered by a power-down edge.

[0009] Compared with existing technologies, this invention provides a universal interface adaptive method and security authentication system based on magnetic connection, which has the following advantages: 1. This invention maps the signal pins of USB-A or USB-C interfaces to four standardized lines—VCC, GND, D+, and D-—through an adapter base. The CC pin configuration is handled by pull-down resistors within the USB-C base, ensuring that the electrical signals received by the security subject always conform to the standard USB 2.0 electrical specifications. Furthermore, the security subject's main control unit consistently uses the USB-A standard protocol to parse data. Leveraging USB-C's native compatibility with USB 2.0, device enumeration and data interaction can be completed without identifying the base type. This achieves the beneficial effect of being compatible with both USB-A and USB-C terminals without needing to identify the base interface type, enabling a single security subject to adapt to all scenarios.

[0010] 2. This invention transforms the magnetic separation action between the security subject and the adapter base into a physical event of power failure across the entire security subject domain. This causes the volatile stored charge on which the temporary sensitive data depends to dissipate naturally as the power supply disappears. Simultaneously, the security chip hardware circuit directly locks the incomplete session on the power failure edge. Under this mechanism, the loss of sensitive data and the termination of the session are physical consequences of the power failure rather than subsequent software responses. Therefore, there are no firmware delays, code vulnerabilities, or residual extraction windows. This achieves passive and unavoidable disconnection self-protection at the semiconductor physical level, thus achieving the beneficial effect of optimizing the magnetic disconnection security protection logic.

[0011] 3. This invention stores the permanent key within the secure core in non-volatile flash memory based on the floating gate charge principle. It is not a magnetic storage medium, and external static magnetic fields cannot change its charge storage state. By encapsulating all magnets in a replaceable adapter base and using low-attraction soft magnetic materials, the magnetic induction intensity is far below the chip's antimagnetic threshold, blocking the penetration of magnetic lines of force and further suppressing residual magnetic fields. After testing and verification under full-machine conditions, the magnetic attraction magnetic field will not cause any tampering, loss, or damage to the key data, thus achieving the beneficial effect of eliminating the magnetic security risks of magnetic attraction encryption devices. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the adapter base and safety main structure of the present invention; Figure 2 This is a schematic diagram of the adapter base structure of the present invention; Figure 3 This is a schematic diagram of the main safety structure of the present invention; Figure 4 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figure 1-4 A universal interface adaptive method based on magnetic connection includes an adapter base and a security body. One end of the adapter base is configured as a USB-A or USB-C male connector, and the other end is provided with magnetic contacts. The security body has a built-in security chip and storage module, and its mating end is provided with magnetic contacts that match the adapter base. The adaptive method includes the following steps: S1, Standardized Mapping of Base Interface: The signal pins of the USB-A or USB-C interface on the adapter base are uniformly mapped to the four standardized lines inside the base: VCC, GND, D+ and D-. S2, Non-directional magnetic coupling conduction: When the safety body is brought close to the adapter base, it automatically adsorbs and aligns using the vertical symmetrical magnetic attraction structure set on the mating surface between the base and the safety body; S3. Single Protocol Parsing and Device Enumeration: After the security subject is powered on, its internal main control unit uses the USB-A standard protocol to parse and process the D+ and D- differential signals. S4. Magnetic disconnection and power failure self-clearing protection: During data transmission or encryption operations, when the security subject is magnetically separated from the adapter base due to external force, a hardware-level security protection mechanism is triggered. S5. Magnetic field isolation protection: During the operation of the above steps, a physical isolation mechanism is used to prevent magnetic fields from interfering with data storage.

[0015] VCC is the power supply line, GND is the ground line, D+ is the positive data line, and D- is the negative data line.

[0016] It is worth noting that the physical layer adaptation of the interface protocol is completed inside the adapter base in S1, omitting the traditional interface type identification circuit, encoding resistor and additional characteristic signal lines, so that the signal output through the base conforms to the standard USB 2.0 electrical specification, regardless of whether the external terminal is USB-A or USB-C.

[0017] It is worth noting that the vertically symmetrical magnetic attraction structure in S2 consists of four vertically symmetrically distributed contacts. The physical connection between power and data is achieved through the vertically symmetrical magnetic attraction structure. This structure is used for attraction at any angle in both forward and reverse directions to ensure reliable contact of the four lines VCC, GND, D+, and D-.

[0018] It is worth noting that in S3, the security subject does not identify the type of the currently connected adapter base: USB-A or USB-C, nor does it switch the communication protocol. Instead, it directly performs handshake communication with the terminal based on the unified USB-A protocol logic and reports the standard USB encrypted device descriptor to the host to complete driver matching and device enumeration.

[0019] It is worth noting that the hardware-level security protection mechanism in S4 includes: S4.1 Instantaneous power failure: The VCC power supply link is cut off, and the entire safety body is powered off; S4.2, Volatile Data Loss: Utilizing the volatile nature of RAM (Random Access Memory), the session cache, temporary keys, and intermediate values ​​stored in it are automatically lost instantly as the charge dissipates; S4.3 Hardware Session Lock: The security chip synchronously triggers hardware-level session lock to block currently incomplete signing, encryption, or authentication sessions and prohibits breakpoint recovery; S4.4 Memory Unit Initialization: The RAM is automatically initialized to zero after a complete power failure, leaving no trace of computation; authentication and key loading must be performed again upon power-up.

[0020] It is worth noting that the physical isolation mechanism in S5 includes: Media selection: Store the permanent key and certificate in non-volatile flash memory based on the floating gate charge principle; Magnetic source isolation: The magnetic magnet is encapsulated in a replaceable adapter base, physically separated from the core storage module.

[0021] A universal interface security authentication system based on magnetic connection, the security authentication system using the adaptive method of claim 6, the system including an adapter base and a security body, wherein the adapter base and the security body are physically separate and detachable structures; The adapter base includes: A universal interface module; the universal interface module is configured with a USB-A male connector or a USB-C male connector to adapt to the corresponding interface of the host terminal. Base contact module; the base contact module is located on the mating end face of the adapter base and includes four conductive contacts: VCC power supply contact, GND ground contact, D+ data contact, and D- data contact, which are vertically symmetrically distributed. Magnetic coupling module; The magnetic coupling module is embedded around the base contact module and uses soft magnetic material with a ring-shaped symmetrical layout. It is used to magnetically align with the safety body and provide an attraction force of 2~3kg. When the external force exceeds the tripping threshold, it automatically separates from the safety body. Internal wiring of the base: The internal wiring of the base only includes four standardized lines, VCC, GND, D+, and D-, which connect the general interface module and the base contact module. There are no interface type identification circuits, coding resistors, or additional characteristic signal lines. The security entity includes: Main contact module; The main contact module is located on the docking end face of the safety body and matches one by one with the four contacts of the base contact module to establish a physical path for power and data after magnetic adsorption. Main control unit; The main control unit is electrically connected to the security chip, and uses the USB-A standard protocol to analyze and process the D+ and D- differential signals. It does not interact with the adapter base through the interface type and does not switch the communication protocol. Security chip; The security chip has a built-in encryption operation engine and non-volatile flash memory storage. The non-volatile flash memory storage is used to store permanent keys, digital certificates and firmware. The security chip is equipped with hardware session locking logic to block incomplete signing, encryption or authentication sessions when power is off. Volatile storage module; The volatile storage module is implemented using RAM and is used to store session cache, temporary session keys and intermediate values ​​for encryption operations. After power failure, the stored charge dissipates instantly and completes automatic zeroing and initialization. When the security body and the adapter base are magnetically attached, the four wires VCC, GND, D+, and D- are connected, and the main control unit reports the standard USB encrypted device descriptor to the host to complete identity authentication, digital signature, or encryption calculation; when the magnetic attachment is separated, the security body is momentarily powered off, the volatile storage module data is automatically lost, the security chip triggers hardware session lock, and the RAM completes zeroing initialization.

[0022] It is worth noting that the magnetic induction intensity of the magnetic contact surface of the magnetic coupling module is lower than the antimagnetic critical threshold of the security chip and non-volatile flash memory storage, and the magnets are all encapsulated inside the adapter base and do not extend to the security body.

[0023] It is worth noting that the four vertically symmetrically distributed conductive contacts can fully conduct the four signals VCC, GND, D+, and D- in both forward and reverse adsorption states, which is used for omnidirectional blind insertion.

[0024] It is worth noting that the magnet used in the magnetic coupling module is a soft magnetic material with low attraction force, and the magnetic induction intensity of the magnetic contact surface is lower than the antimagnetic critical threshold of the security chip and non-volatile flash memory storage.

[0025] It is worth noting that the reversible magnetic connection adopts a vertically symmetrical four-wire contact + ring symmetrical magnetic structure. Both forward and reverse adsorption can fully conduct four signals: VCC, GND, D+, and D-. It can achieve blind insertion connection at all angles without the need for direction recognition. The magnetic overload tripping structure actively separates the device when pulled by external force, protecting the host port and the device contacts.

[0026] The four-wire unified transmission multi-interface adaptive method specifically involves: eliminating the interface feature identification circuit and uniformly using VCC / GND / D+ / D- as the sole transmission channel; standardizing the mapping of USB-A and USB-C dock electrical signals to the four-wire link; and using the USB-A protocol to parse all transmitted data, relying on the universal USB electrical specification for inherent compatibility with both types of interfaces, eliminating the need to switch protocols or identify dock types, thus achieving extremely simplified hardware and software adaptation logic.

[0027] The magnetic disconnection and power-off self-clearing security protection principle utilizes the physical characteristic of charge dissipation when the RAM volatile storage medium is powered off. The entire machine is powered off the instant the magnetic disconnection occurs, and the cache, temporary keys, and intermediate values ​​of the operation are automatically lost. At the same time, a hardware session lock is triggered to block the business process. After the power failure, the RAM is automatically initialized and cleared. When the power is restored, a new session space is generated. It relies on the physical characteristics of the hardware to achieve passive high-level security protection without software clearing of residual vulnerabilities.

[0028] The magnetic field non-destructive storage protection principle is to form a complete magnetic protection system from four dimensions: the underlying principle of the storage medium, the magnetic induction intensity of the magnet, and the aging test of the whole machine. It distinguishes the characteristics of flash memory and magnetic storage media, isolates all magnetic sources in a replaceable base, and blocks magnetic penetration through multiple layers of shielding. Through actual testing, it is verified that the magnetic field cannot tamper with or damage the key storage data inside the device, thus eliminating the security risks of magnetic interference from the magnetic structure.

[0029] The described separate hardware isolation principle integrates the core security chip and key flash memory storage into the security unit; vulnerable components such as magnetic contacts, magnets, and universal USB interfaces are all located on a low-cost, replaceable adapter base, achieving physical isolation between the core security area and vulnerable interfaces. Once the adapter base is damaged, only low-cost parts need to be replaced, and the security unit can be reused long-term, balancing security and economy. Example 1 The adapter base has a USB-A or USB-C male connector. The mating face has four vertically symmetrical contacts (VCC, GND, D+, D-) and a ring-shaped magnetic soft magnet. The safety body has symmetrical four-wire contacts and a magnetic positioning groove on the mating end. It has a built-in safety chip and flash memory storage module. The magnetic attraction force is 2-3kg, and it will not fall off under normal grip and movement. It can be smoothly separated with a pulling force greater than the threshold. The base has only four standard USB wires inside, without additional resistors or identification circuits.

[0030] Insert the corresponding USB-A / USB-C adapter into the interface of a computer or other terminal host, and the adapter will power on. The handheld safety device can be brought close to the docking end face of the base at any forward or reverse angle, and it will automatically be magnetically attracted and aligned. With vertically symmetrical four-wire contacts fully engaged and conducting, power and differential data links are established, and the host directly recognizes it as a standard USB encrypted device, requiring no additional configuration for normal use.

[0031] The adapter base is inserted into the terminal interface to complete the power-on process, and the four-wire link is connected for power supply.

[0032] The main body is magnetically attached to the base, and the four wires VCC, GND, D+, and D- establish a complete transmission channel.

[0033] The main control unit for security uses the USB-A protocol to parse D+ / D- differential signals, does not recognize the interface type of the base terminal, and processes data uniformly according to the standard USB-A communication logic.

[0034] The main controller reports the standard USB encrypted device descriptor to the terminal, and the terminal automatically matches the driver to complete functions such as identity authentication, digital signature, and encryption calculation. Both USB-A and USB-C docks can work normally without difference.

[0035] The device is in a sensitive computational session such as digital signature, key encryption / decryption, and identity authentication. The security subject is accidentally pulled or maliciously removed, causing it to be magnetically separated from the base.

[0036] The VCC power supply line was instantly and completely cut off, and all hardware modules of the machine were simultaneously powered down. The session cache, temporary session keys, and intermediate values ​​for encryption operations stored in RAM are automatically lost due to the dissipation of charge; The security chip hardware circuit synchronously locks the currently incomplete session and prohibits session breakpoint recovery; after the RAM is powered off, it automatically completes the initialization and zeroing of the storage unit, leaving no trace of extractable temporary data.

[0037] Once the security unit is magnetically attached to the base and powered on again, the RAM will automatically allocate new blank operating space, and all encrypted services will restart from scratch, preventing the leakage of sensitive data during the disconnection process.

[0038] The device key storage is a semiconductor non-volatile flash memory that relies on charge to store data. It is not a magnetic storage medium, and a magnetic field cannot change the data state of the storage unit. The magnetic magnet is a soft magnetic material with low attraction force. Its magnetic induction intensity is far below the critical value of the antimagnetic barrier of the chip storage medium, which is insufficient to interfere with the storage cell.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal interface adaptive method based on magnetic connection, characterized in that, The device includes an adapter base and a security body. One end of the adapter base is configured with a USB-A or USB-C male connector, and the other end has a magnetic contact. The security body has a built-in security chip and storage module, and its mating end has a magnetic contact that matches the adapter base. The adaptive method includes the following steps: S1, Standardized Mapping of Base Interface: The signal pins of the USB-A or USB-C interface on the adapter base are uniformly mapped to the four standardized lines inside the base: VCC, GND, D+ and D-. S2, Non-directional magnetic coupling conduction: When the safety body is brought close to the adapter base, it automatically adsorbs and aligns using the vertical symmetrical magnetic attraction structure set on the mating surface between the base and the safety body; S3, Single Protocol Parsing and Device Enumeration: After the security subject is powered on, its internal main control unit uses the USB-A standard protocol to parse the D+ / D- signals, does not interact with the base in any interface type, and does not switch protocols; S4. Magnetic disconnection and power failure self-clearing protection: During data transmission or encryption operations, when the security subject is magnetically separated from the adapter base due to external force, a hardware-level security protection mechanism is triggered. S5. Magnetic field isolation protection: During the operation of the above steps, a physical isolation mechanism is used to prevent magnetic fields from interfering with data storage. VCC is the power supply line, GND is the ground line, D+ is the positive data line, and D- is the negative data line.

2. The universal interface adaptive method based on magnetic connection according to claim 1, characterized in that: In S1, the physical layer adaptation of the interface protocol is completed inside the adapter base, omitting the traditional interface type identification circuit, encoding resistor and additional characteristic signal lines, so that the signal output through the base conforms to the standard USB 2.0 electrical specification, regardless of whether the external terminal is USB-A or USB-C.

3. The universal interface adaptive method based on magnetic connection according to claim 2, characterized in that: The vertically symmetrical magnetic attraction structure in S2 consists of four vertically symmetrically distributed contacts. The physical connection between power and data is achieved through the vertically symmetrical magnetic attraction structure. This structure is used for attraction at any angle in both forward and reverse directions to ensure reliable contact of the four wires VCC, GND, D+, and D-.

4. The universal interface adaptive method based on magnetic connection according to claim 3, characterized in that: In S3, the security subject does not identify the type of the currently connected adapter base: USB-A or USB-C, nor does it switch the communication protocol. Instead, it directly performs handshake communication with the terminal based on the unified USB-A protocol logic and reports the standard USB encrypted device descriptor to the host to complete driver matching and device enumeration.

5. The universal interface adaptive method based on magnetic connection according to claim 4, characterized in that: The hardware-level security protection mechanism in S4 includes: S4.1 Instantaneous power failure: The VCC power supply link is cut off, and the entire safety body is powered off; S4.2, Volatile Data Loss: Utilizing the volatile nature of RAM (Random Access Memory), the session cache, temporary keys, and intermediate values ​​stored in it are automatically lost instantly as the charge dissipates; S4.3 Hardware Session Lock: The security chip synchronously triggers hardware-level session lock to block currently incomplete signing, encryption, or authentication sessions and prohibits breakpoint recovery; S4.4 Memory Unit Initialization: The RAM is automatically initialized to zero after a complete power failure, leaving no trace of computation; authentication and key loading must be performed again upon power-up.

6. The universal interface adaptive method and security authentication system based on magnetic connection according to claim 5, characterized in that: The physical isolation mechanism in S5 includes: Media selection: Store the permanent key and certificate in non-volatile flash memory based on the floating gate charge principle; Magnetic source isolation: The magnetic magnet is encapsulated in a replaceable adapter base, physically separated from the core storage module.

7. A universal interface security authentication system based on magnetic connection, characterized in that, The security authentication system uses the adaptive method described in claim 6. The system includes an adapter base and a security body, and the adapter base and the security body are physically separate and detachable structures. The adapter base includes: A universal interface module; the universal interface module is configured with a USB-A male connector or a USB-C male connector to adapt to the corresponding interface of the host terminal. Base contact module; the base contact module is located on the mating end face of the adapter base and includes four conductive contacts: VCC power supply contact, GND ground contact, D+ data contact, and D- data contact, which are vertically symmetrically distributed. Magnetic coupling module; The magnetic coupling module is embedded around the base contact module and uses soft magnetic material with a ring-shaped symmetrical layout. It is used to magnetically align with the safety body and provide an attraction force of 2~3kg. When the external force exceeds the tripping threshold, it automatically separates from the safety body. Internal wiring of the base: The internal wiring of the base only includes four standardized lines, VCC, GND, D+, and D-, which connect the general interface module and the base contact module. There are no interface type identification circuits, coding resistors, or additional characteristic signal lines. The security entity includes: Main contact module; The main contact module is located on the docking end face of the safety body and matches one by one with the four contacts of the base contact module to establish a physical path for power and data after magnetic adsorption. Main control unit; The main control unit is electrically connected to the security chip, and uses the USB-A standard protocol to analyze and process the D+ and D- differential signals. It does not interact with the adapter base through the interface type and does not switch the communication protocol. Security chip; The security chip has a built-in encryption operation engine and non-volatile flash memory storage. The non-volatile flash memory storage is used to store permanent keys, digital certificates and firmware. The security chip is equipped with hardware session locking logic to block incomplete signing, encryption or authentication sessions when power is off. Volatile storage module; The volatile storage module is implemented using RAM and is used to store session cache, temporary session keys and intermediate values ​​for encryption operations. After power failure, the stored charge dissipates instantly and completes automatic zeroing and initialization. When the security body and the adapter base are magnetically attached, the four wires VCC, GND, D+, and D- are connected, and the main control unit reports the standard USB encrypted device descriptor to the host to complete identity authentication, digital signature, or encryption operation; when the magnetic attachment is separated, the security body is momentarily powered off, the volatile storage module data is automatically lost, the security chip triggers hardware session lock, and the RAM completes zeroing initialization. The adapter base is a passive component, which contains only physical wiring and magnetic components, and does not contain any protocol conversion chip, identification circuit or security chip. The security entity is an independent security container, which integrates a security chip and RAM. The security chip is equipped with a hardware session latch triggered by a power-down edge.

8. The universal interface adaptive method and security authentication system based on magnetic connection according to claim 7, characterized in that: The magnetic induction intensity of the magnetic contact surface of the magnetic coupling module is lower than the antimagnetic critical threshold of the security chip and non-volatile flash memory storage, and the magnets are all encapsulated inside the adapter base and do not extend to the security body.

9. The universal interface adaptive method and security authentication system based on magnetic connection according to claim 8, characterized in that: The four vertically symmetrically distributed conductive contacts can fully conduct the four signals VCC, GND, D+, and D- in both forward and reverse adsorption states, enabling omnidirectional blind insertion.

10. The universal interface adaptive method and security authentication system based on magnetic connection according to claim 9, characterized in that: The magnetic coupling module uses a low-attraction soft magnetic material as its magnet, and the magnetic induction intensity of the magnetic contact surface is lower than the antimagnetic critical threshold of security chips and non-volatile flash memory storage.

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