CN107818259B - Printing authorization control circuit and control method - Google Patents
Printing authorization control circuit and control method Download PDFInfo
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- CN107818259B CN107818259B CN201711220903.0A CN201711220903A CN107818259B CN 107818259 B CN107818259 B CN 107818259B CN 201711220903 A CN201711220903 A CN 201711220903A CN 107818259 B CN107818259 B CN 107818259B
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- 238000013475 authorization Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000012795 verification Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 4
- PBGKNXWGYQPUJK-UHFFFAOYSA-N 4-chloro-2-nitroaniline Chemical compound NC1=CC=C(Cl)C=C1[N+]([O-])=O PBGKNXWGYQPUJK-UHFFFAOYSA-N 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
- G06F21/44—Program or device authentication
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1238—Secure printing, e.g. user identification, user rights for device usage, unallowed content, blanking portions or fields of a page, releasing held jobs
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1278—Dedicated interfaces to print systems specifically adapted to adopt a particular infrastructure
- G06F3/1279—Controller construction, e.g. aspects of the interface hardware
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Security & Cryptography (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Software Systems (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Power Sources (AREA)
Abstract
The invention discloses a printing authorization control circuit and a control method, wherein the circuit comprises a power supply module, an interface connection and protection module, a main control module, a storage module and a level conversion module; the input end of the power supply module is connected with a USB5V power supply, and the output end of the power supply module is connected with the storage module, the main control module and the level conversion module; the interface connection and protection module comprises a first USB interface, a USB control chip and a second USB interface which are sequentially connected in series, wherein the first USB interface is connected with the computer end, and the second USB interface is connected with the printer end; the grid electrode of the PMOS tube of the main control module is connected with the main control MCU, the source electrode is connected with a USB5V power supply, and the drain electrode is grounded; the main control MCU is connected with the USB control chip; the level conversion module is connected with the serial port of the computer, the storage module stores the secret key, and the verification unit of the main control MCU is used for authenticating with the computer. The circuit ensures that the printing operation is performed in an application authorization environment.
Description
Technical Field
The invention belongs to the field of printer and printing content safety management, and particularly relates to a printing authorization control circuit and a control method.
Background
Along with popularization of electronic certificates in a printing form, many documents needing handwriting are presented in a printing mode, and the existing solutions on the market are often to manage printing and calling of a printer through application software, but due to universality of printing protocols and printer control methods, the situation that the printer or a printing module is directly called for printing due to authorization management of the application software is skipped, and further the electronic certificates can be falsified and forged, inconvenience is brought to management, and therefore printing authorization is required to be controlled, and protective measures in printing safety are increased.
Disclosure of Invention
The invention aims to provide a printing authorization control circuit and a control method, which are used for performing authorization control on a USB printer and a printing module and controlling printing security authorization so as to ensure secure printing.
In one aspect, the invention provides a printing authorization control circuit, which comprises a power supply module, an interface connection and protection module, a main control module, a storage module and a level conversion module;
the input end of the power supply module is connected with a USB5V power supply, and the storage module, the main control module and the level conversion module are all connected with the output end of the power supply module;
the interface connection and protection module comprises a first USB interface, a USB control chip and a second USB interface which are sequentially connected in series, wherein the first USB interface is connected with a computer end, and the second USB interface is connected with a printer end;
the main control module comprises a main control MCU and a PMOS tube, wherein the grid electrode of the PMOS tube is connected with the PCON end of the main control MCU, the source electrode is connected with a USB5V power supply, and the drain electrode is grounded; the enabling end of the main control MCU is connected with the enabling end of the USB control chip, the main control MCU is connected with the storage module and the level conversion module, the level conversion module is connected with the serial port of the computer, and the storage module stores the secret key;
the main control MCU comprises a verification unit, and the verification unit is used for carrying out identity authentication with the computer through the secret key.
The main control MCU is communicated with the computer through a serial port of the level conversion module, so that identity authentication is realized through key verification, and if the authentication is passed, the authorization control circuit works normally; if verification fails and the verification fails to be over the preset times, the master control MCU in the authorization control circuit operates the PMOS tube to conduct so that the USB5V power supply is conducted to the ground, and then the computer to the first USB interface part enters an overcurrent protection state, at the moment, the operating system of the computer turns off the USB port from the computer to the printing authorization control circuit according to the standard USB protocol, the master control MCU sends a control instruction to the USB control chip through the enabling end, and the USB control chip cuts off the hardware power supply connection of the first USB interface, so that hardware damage is avoided.
Preferably, the interface connection and protection module further comprises a USB protection chip, and the first USB interface, the USB protection chip and the second USB interface are sequentially connected in series.
The USB protection chip is used for realizing the USB interference resistance function.
Preferably, the power supply module comprises a linear voltage stabilizing chip and three capacitors, wherein the voltage input end of the linear voltage stabilizing chip is connected with a USB5V power supply, and the three capacitors are connected in parallel between the voltage input end and the voltage output end of the linear voltage stabilizing chip.
The power supply module outputs 3.3V voltage.
Preferably, a 4.7K resistor is connected in series between the master MCU and the grid electrode of the PMOS tube, and a 10K resistor is connected in series between the grid electrode of the PMOS tube and the USB5V power supply.
Preferably, the storage module is connected with an SPI pin of the main control MCU.
Preferably, the TX and RX pins of the master MCU are correspondingly connected with the RX and TX pins of the level conversion module.
On the other hand, the invention provides a control method based on the circuit, which comprises the following steps:
step 1: the main control MCU and the computer perform identity authentication through the secret key stored by the storage module, if the identity authentication is passed, printing is authorized, if the secret key verification fails to exceed the preset times, the identity authentication fails and the step 2 is executed;
step 2: the main control module controls the PMOS tube to be conducted so as to conduct the USB5V power supply to the ground, and sends a control instruction to the USB control chip through the enabling end;
after the USB5V power supply is conducted to the ground, the first USB interface part enters an overcurrent protection state;
step 3: and the USB control chip disconnects the hardware power supply of the first USB interface.
Preferably, the method further comprises: and after the main control MCU detects the re-power-on or abnormal power-off, the key stored in the storage module is erased.
The security performance is improved, and the memory module is prevented from being disassembled to be used for reversely reading confidential information.
Advantageous effects
The invention provides a printing authorization control circuit and a control method, wherein the control of printing operation between a printer and a computer is realized through connection among a power supply module, an interface connection and protection module, a main control module, a storage module and a level conversion module, wherein after the key verification of the main control module fails to exceed preset times, a main control MCU of the main control module conducts a USB5V power supply to the ground through a PMOS tube of the main control module, so that the computer and a first USB interface in the interface connection and protection module enter an overcurrent protection state, a USB control chip in the interface connection and protection module is caused to disconnect a hardware power supply of the first USB interface, hardware damage is prevented, the whole printing authorization control circuit belongs to a power-off state, printing cannot be performed on the premise of failed authentication, the printing safety is improved, and printing content is ensured to be printed in an authorized application environment; meanwhile, after the main control MCU detects the re-power-on or abnormal power-off, the key stored in the storage module is erased, so that the storage module is prevented from being disassembled and used for reversely reading confidential information.
Drawings
FIG. 1 is a circuit diagram of an interface connection and protection module provided by an embodiment of the present invention;
fig. 2 is a circuit diagram of a power supply module according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a master control module according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a memory module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a level shift module according to an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to examples.
As shown in fig. 1-5, the invention provides a print authorization control circuit, which comprises a power supply module, an interface connection and protection module, a main control module, a storage module and a level conversion module. Fig. 1 is a circuit diagram of an interface connection and protection module, fig. 2 is a circuit diagram of a power supply module, fig. 3 is a circuit diagram of a main control module, fig. 4 is a circuit diagram of a memory module, and fig. 5 is a circuit diagram of a level conversion module.
As shown in fig. 1, the interface connection and protection module includes a first USB interface J1, a USB control chip U3, a second USB interface J2, and a USB protection chip U4, where the first USB interface J1, the USB control chip U3, and the second USB interface J2 are sequentially connected in series, the first USB interface J1, the USB protection chip U4, and the second USB interface J2 are sequentially connected in series, the first USB interface J1 is connected with the computer end, and the second USB interface J2 is connected with the printer end. Specifically, the 5V voltage interface of the first USB interface J1 is connected to the power input IN of the USB control chip U3, the output end of the USB control chip U3 is connected to the 5V voltage interface of the second USB interface J2, and the first USB interface J1, the second USB interface J2 and the GND terminal of the USB control chip U3 are grounded; the D+ and D-data wires of the first USB interface J1 and the second USB interface J2 are connected in series with a USB protection chip U4. In this embodiment, the USB control chip U3 is a chip with model LM3525M-H of Texas instruments, and the USB protection chip U4 is a chip with model IP4234CZ 6.
As shown in fig. 2, the input end of the power supply module is connected with a USB5V power supply, the output end outputs a 3.3V power supply, and the storage module, the main control module and the level conversion module are all connected with the output end. The power supply module includes a linear voltage stabilizing chip U1 and three capacitors, which are respectively a capacitor C4, a capacitor C5 and a capacitor C6 as shown in the figure. The voltage input end of the linear voltage stabilizing chip U1 is connected with a USB5V power supply, and the three capacitors are connected in parallel between the voltage input end and the voltage output end of the linear voltage stabilizing chip U1, wherein the capacitor C5 and the capacitor C6 are used for filtering. In this embodiment, the linear voltage stabilizing chip U1 is a chip with a model number of ASM 117.
As shown in fig. 3-5, the main control module comprises a main control MCU U2 and a PMOS transistor Q6, wherein the gate of the PMOS transistor Q6 is connected with the PCON end of the main control MCU U2, the source is connected with a USB5V power supply, and the drain is grounded; A4.7K resistor is connected in series between the main control MCU U2 and the grid electrode of the PMOS tube Q6, and a 10K resistor is connected in series between the grid electrode of the PMOS tube Q6 and the USB5V power supply. When the PMOS tube Q6 is conducted, the USB5V power supply is conducted to the ground, so that the computer to the first USB interface part enters an overcurrent protection state, and at the moment, the USB port from the computer to the printing authorization control circuit is closed by an operating system of the computer according to a standard USB protocol. In addition, the enable end EN of the main control MCU U2 is connected to the enable end EN of the USB control chip U3, and is used for transmitting control commands. When the computer enters an overcurrent protection state to the first USB interface part, the main control MCU U2 sends an instruction to the USB control chip U3 through the enabling end EN, so that the USB control chip U3 is caused to disconnect the hardware power supply connection of the first USB interface, the hardware damage is avoided, the whole printing authorization control circuit is further powered off, and printing cannot be detected and called. In addition, as shown in fig. 3 and 4, the main control MCU U2 is connected to the storage module U5, and is configured to update or delete information stored in the storage module, such as a key; the memory module U5 is connected with an SPI pin of the main control MCU U2. In addition, the main control MCU U2 is connected with the level conversion module U6, and the level conversion module U6 is connected with a serial port of a computer and is used for realizing the level conversion between the main control MCU U2 and the computer; the TX and RX pins of the main control MCU U2 are correspondingly connected with the RX and TX pins of the level conversion module U6, and the level conversion module U6 is connected with an RS232 serial port of the computer. In this embodiment, the master control MCU U2 should have a serial port, a power failure detection function and an SPI interface, for example, an MCU with the model number MSP430 of texas instruments may be selected; an MCU of model STM32 and an MCU of model DA 14580; the memory module U5 is a chip with the model of W25X 20; the level conversion module U6 is a chip with the model number of MAX232 CSE.
When the printing authorization circuit works normally, the key check between the main control module and the computer is normal, and the modules are communicated normally; when the key verification failure between the main control module and the computer exceeds the preset times, for example, 3 times, under the action of the main control MCU U2 controlling the conduction of the PMOS tube Q6, the first USB interface in the printing authorization circuit and the computer part enter an overcurrent protection state, the USB control chip U3 disconnects the hardware power supply of the first USB interface, and the printing cannot be detected and called; and if the printing authorization control circuit is recovered to a normal state from the authorization abnormal state, the modules of the printing authorization control circuit are in normal communication.
The invention also provides a control method based on the circuit, which comprises the following steps:
step 1: the main control MCU and the computer carry out identity authentication through key verification, if the identity authentication is passed, printing is authorized, if the key verification fails to exceed the preset times, the identity authentication fails and the step 2 is executed;
step 2: the main control module controls the PMOS tube to be conducted so as to conduct the USB5V power supply to the ground, and sends a control instruction to the USB control chip through the enabling end;
after the USB5V power supply is conducted to the ground, the first USB interface part enters an overcurrent protection state;
step 3: and the USB control chip disconnects the hardware power supply of the first USB interface.
Further, the method further comprises the step that after the main control MCU detects that the power is turned on again or the power is abnormally turned off, the secret key stored in the storage module is erased. The chip for preventing the occurrence of the storage key is detached and used for reversely reading the confidential information. Wherein the key stored by the storage module is sent by the computer and updated. The generation process of the secret key stored by the storage module comprises the following steps: the computer sends the key to the main control MCU in the form of instruction+initial key, and the main control MCU sends the key to the storage module for storage. In addition, after the master control MCU receives the secret key, the master control MCU randomly generates a new secret key and sends the new secret key to the computer for the verification process of the step 1. The invention provides a printing authorization control circuit and a control method, which belong to a safeguard measure in the aspect of printing safety, and are particularly important for authorizing and authenticating printing operation, especially printing sensitive content or certificates such as finance, medical treatment and the like.
It should be emphasized that the examples described herein are illustrative rather than limiting, and that this invention is not limited to the examples described in the specific embodiments, but is capable of other embodiments in accordance with the teachings of the present invention, as long as they do not depart from the spirit and scope of the invention, whether modified or substituted, and still fall within the scope of the invention.
Claims (8)
1. A print authorization control circuit, characterized by: the device comprises a power supply module, an interface connection and protection module, a main control module, a storage module and a level conversion module;
the input end of the power supply module is connected with a USB5V power supply, and the storage module, the main control module and the level conversion module are all connected with the output end of the power supply module;
the interface connection and protection module comprises a first USB interface, a USB control chip and a second USB interface which are sequentially connected in series, wherein the first USB interface is connected with a computer end, and the second USB interface is connected with a printer end;
the main control module comprises a main control MCU and a PMOS tube, wherein the grid electrode of the PMOS tube is connected with the PCON end of the main control MCU, the source electrode is connected with a USB5V power supply, and the drain electrode is grounded; the enabling end of the main control MCU is connected with the enabling end of the USB control chip, the main control MCU is connected with the storage module and the level conversion module, the level conversion module is connected with the serial port of the computer, and the storage module stores the secret key;
the main control MCU comprises a verification unit which is used for carrying out identity authentication with the computer through the secret key;
the main control module is used for: after identity authentication fails, the PMOS tube is controlled to be conducted to enable the USB5V power supply to be conducted to the ground, and a control instruction is sent to the USB control chip through the enabling end to enable the USB control chip to disconnect the hardware power supply of the first USB interface; after the USB5V power supply is conducted to the ground, the first USB interface part enters an overcurrent protection state.
2. The circuit of claim 1, wherein: the interface connection and protection module further comprises a USB protection chip, and the first USB interface, the USB protection chip and the second USB interface are sequentially connected in series.
3. The circuit of claim 1, wherein: the power supply module comprises a linear voltage stabilizing chip and three capacitors, wherein the voltage input end of the linear voltage stabilizing chip is connected with a USB5V power supply, and the three capacitors are connected in parallel between the voltage input end and the voltage output end of the linear voltage stabilizing chip.
4. The circuit of claim 1, wherein: and a 4.7K resistor is connected in series between the master control MCU and the grid electrode of the PMOS tube, and a 10K resistor is connected in series between the grid electrode of the PMOS tube and the USB5V power supply.
5. The circuit of claim 1, wherein: and the storage module is connected with an SPI pin of the main control MCU.
6. The circuit of claim 1, wherein: and the TX and RX pins of the master control MCU are correspondingly connected with the RX and TX pins of the level conversion module.
7. A control method based on a circuit according to any of the preceding claims 1-6, characterized in that: the method comprises the following steps:
step 1: the main control MCU and the computer perform identity authentication through the secret key stored by the storage module, if the identity authentication is passed, printing is authorized, if the secret key verification fails to exceed the preset times, the identity authentication fails and the step 2 is executed;
step 2: the main control module controls the PMOS tube to be conducted so as to conduct the USB5V power supply to the ground, and sends a control instruction to the USB control chip through the enabling end;
after the USB5V power supply is conducted to the ground, the first USB interface part enters an overcurrent protection state;
step 3: and the USB control chip disconnects the hardware power supply of the first USB interface.
8. The method according to claim 7, wherein: further comprises: and after the main control MCU detects the re-power-on or abnormal power-off, the key stored in the storage module is erased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711220903.0A CN107818259B (en) | 2017-11-29 | 2017-11-29 | Printing authorization control circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711220903.0A CN107818259B (en) | 2017-11-29 | 2017-11-29 | Printing authorization control circuit and control method |
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| CN107818259B true CN107818259B (en) | 2024-02-09 |
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| CN109766685A (en) * | 2019-01-21 | 2019-05-17 | 安徽养和医疗器械设备有限公司 | A kind of hardware digital authorization module and its authorization method realized by USB interface |
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| 移动产品USB电源接口保护解决方案;罗勇进;;集成电路应用(11);42-43+47 * |
| 集成电路芯片安全隐患检测技术;罗宏伟;;半导体技术(12);1094-1097 * |
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| CN107818259A (en) | 2018-03-20 |
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