CN114236999A - Data protection method, consumable chip, consumable and image forming device - Google Patents
Data protection method, consumable chip, consumable and image forming device Download PDFInfo
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1875—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit provided with identifying means or means for storing process- or use parameters, e.g. lifetime of the cartridge
- G03G21/1878—Electronically readable memory
- G03G21/1889—Electronically readable memory for auto-setting of process parameters, lifetime, usage
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1875—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit provided with identifying means or means for storing process- or use parameters, e.g. lifetime of the cartridge
- G03G21/1878—Electronically readable memory
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Abstract
The embodiment of the application provides a data protection method, a consumable chip, a consumable and an image forming device. The method is applied to a consumable chip which is arranged on a consumable, the consumable is detachably arranged on an image forming device, the image forming device comprises an image forming control unit, the consumable chip comprises a Static Random Access Memory (SRAM), and the method comprises the following steps: receiving request information of the characteristic information stored in the SRAM; transmitting feature information stored in the SRAM to the image formation control unit based on the received request information, the feature information being used to generate key information. The application is used for improving the data security.
Description
Technical Field
The application relates to the technical field of imaging, in particular to a data protection method, a consumable chip, a consumable and an image forming device.
Background
With the popularization of office automation, printing apparatuses have become indispensable in office activities, and consumables such as a main control chip and an ink cartridge of a printer need to be used during printing. At present, consumable chips are generally used as media for recording information and usage amount of the consumables. In the process of using the consumable, the consumable needs to communicate and authenticate with a main control chip of the printer. In the prior art, in order to improve the security of data, the authentication information and other important data can be stored in an encrypted manner. The key used in encryption is usually generated by using fixed data such as the serial number of the consumable chip, so that illegal molecules can more easily acquire the data stored in the chip by illegal means, thereby bringing hidden danger to the security of the data.
A more secure key generation method is urgently needed, so that the security of data stored in the consumable chip is effectively ensured.
Disclosure of Invention
In view of this, the present application provides a data protection method, a consumable chip, a consumable, and an image forming apparatus, so as to solve the problem of poor security of important data stored in the prior art.
In a first aspect, an embodiment of the present application provides a method for data protection, which is applied to a consumable chip, where the consumable chip is installed on a consumable, the consumable is detachably installed on an image forming apparatus, the image forming apparatus includes an image formation control unit, and the consumable chip includes a static random access memory SRAM, and includes:
receiving request information of the characteristic information stored in the SRAM;
transmitting feature information stored in the SRAM to the image formation control unit based on the received request information, the feature information being used to generate key information.
Preferably, the sending, to the image formation control unit, feature information stored in the SRAM based on the received request information, before the feature information is used to generate key information, further includes:
receiving a first control instruction;
and entering an SRAM feature extraction mode according to the first control instruction, and refusing to respond to a data writing instruction for writing data into a storage unit used for storing the feature information in the SRAM when the consumable chip is in the SRAM feature extraction mode.
Preferably, the method further comprises:
and receiving ciphertext data generated based on the key information, and storing the ciphertext data.
Preferably, the method further comprises:
receiving a second control instruction;
and exiting the SRAM feature extraction mode according to the second control instruction.
Preferably, the feature information is specifically used for generating the key information in combination with attribute information of the consumable chip.
In a second aspect, an embodiment of the present application provides a consumable chip, where the consumable chip can be installed on a consumable, the consumable can be detachably installed on an image forming apparatus, and the consumable chip includes:
a Static Random Access Memory (SRAM);
and the chip control unit is used for receiving the request information of the characteristic information stored in the SRAM and sending the characteristic information stored in the SRAM to the image forming control unit based on the received request information, wherein the characteristic information is used for generating key information.
Preferably, the chip control unit is further configured to receive a first control instruction, and enter an SRAM feature extraction mode according to the first control instruction, and when the consumable chip is in the SRAM feature extraction mode, the chip control unit is specifically configured to reject a data write instruction for responding to write data to a storage unit in the SRAM, the storage unit being configured to store the feature information.
Preferably, the chip control unit is further configured to receive ciphertext data generated based on the key information, and store the ciphertext data.
Preferably, the chip control unit is further configured to receive a second control instruction, and exit the SRAM feature extraction mode according to the second control instruction.
Preferably, the characteristic information is used for generating the key information in combination with attribute information of the consumable chip.
In a third aspect, an embodiment of the present application provides a consumable, including: a housing;
a developer accommodating portion, located within the housing, for accommodating a developer; and
the consumable chip of the above embodiment.
Preferably, the consumable further comprises:
a developer conveying member for conveying the developer.
Preferably, the consumable further comprises:
a photosensitive drum;
a charging roller for charging the photosensitive drum.
In a fourth aspect, an embodiment of the present application provides a consumable, comprising:
a photosensitive drum;
a charging roller for charging the photosensitive drum; and
the consumable chip of the above embodiment.
In a fifth aspect, an embodiment of the present application provides an image forming apparatus, including: the system comprises a consumable, a controller and a controller, wherein a consumable chip is installed on the consumable and comprises a chip control unit and a Static Random Access Memory (SRAM);
the image forming control unit is used for sending request information of the characteristic information stored in the SRAM to the consumable chip;
a chip control unit configured to receive request information of the feature information stored in the SRAM, and send the feature information stored in the SRAM to the image formation control unit based on the received request information;
the image forming control unit is further used for receiving the characteristic information sent by the consumable chip and generating key information based on the characteristic information.
By adopting the scheme provided by the embodiment of the application, when the request information of the characteristic information stored in the SRAM is received, the characteristic information stored in the SRAM is sent to the image forming control unit, so that the image forming control unit generates the key information according to the characteristic information. In this way, in the embodiment of the present application, the key information is generated by using the feature information stored in the SRAM. Because the characteristic information stored in the SRAM is related to environmental factors such as voltage, noise and the like, and the specific value of the characteristic information is not a fixed value, the probability that illegal molecules acquire the characteristic information stored in the SRAM and directly generate a correct key is greatly reduced, and the safety and the reliability of data are improved. Moreover, the consumable chip does not need to have the function of generating the key information, so that the cost is saved, and the stability is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a memory circuit of an SRAM memory cell according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a method for protecting data according to an embodiment of the present application;
fig. 4 is a schematic flow chart of another data protection method according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a power circuit of a consumable chip controlled by an image forming control unit according to an embodiment of the present disclosure;
fig. 6 is a schematic flow chart of another data protection method according to an embodiment of the present application;
FIG. 7 is a schematic structural diagram of a consumable chip according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural diagram of a consumable provided in an embodiment of the present application;
FIG. 9 is a schematic structural diagram of another consumable provided in the embodiments of the present application;
FIG. 10 is a schematic structural diagram of another consumable provided in the embodiments of the present application;
fig. 11 is a schematic structural diagram of another image forming apparatus according to an embodiment of the present application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Before specifically describing the embodiments of the present application, terms applied or likely to be applied to the embodiments of the present application will be explained first.
Static Random Access Memory (SRAM): random access memory, which stores data that is constantly maintained as long as it remains powered. The SRAM comprises a plurality of memory cells, and each memory cell is realized by six transistor combinations. As shown in fig. 1, the specific implementation circuit includes: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5 and a sixth transistor T6. The first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 form a latch. The gate of the first transistor T1 is connected to the drain of the second transistor T2, the source of the fourth transistor T4, and the gate of the third transistor T3. The source of the first transistor T1 is connected to the power supply, and the drain of the first transistor T1 is connected to the source of the third transistor T3, the gate of the second transistor T2, and the gate of the fourth transistor T4. The source of the second transistor T2 is connected to a power supply. The drain of the third transistor T3 is grounded. The drain of the fourth transistor T4 is grounded. The first transistor T1 and the third transistor T3 constitute an inverter, the second transistor T2 and the fourth transistor T4 constitute an inverter, and the two inverters constitute a latch. The first output Q1 of the latch is connected to the drain of the first transistor T1 and the source of the third transistor T3, and the second output Q2 of the latch is connected to the drain of the second transistor T2 and the source of the fourth transistor T4. The gate of the fifth transistor T5 is connected to the Word Line (Word Line), the source of the fifth transistor T5 is connected to the Bit Line (Bit Line), and the drain of the fifth transistor T5 is connected to the first output Q1 of the latch. The gate of the sixth transistor T6 is connected to the word line, the source of the sixth transistor T6 is connected to the second output Q2 of the latch, and the drain of the sixth transistor T6 is connected to the bit line. The fifth transistor T5 and the sixth transistor T6 are control switches for reading and writing data of a memory cell of the SRAM.
A non-volatile memory is a memory in which stored data does not disappear when current is turned off.
In the prior art, in order to improve the security of data, the authentication information and other important data can be stored in an encrypted manner. The key used in encryption is usually generated by using fixed data such as the serial number of the consumable chip, so that an illegal molecule can easily acquire the data stored in the chip by an illegal means, thereby bringing hidden danger to the safety of the data.
In view of the above problem, an embodiment of the present application provides a data protection method, which is applied to a consumable chip and sends feature information stored in an SRAM to an image formation control unit when receiving request information of the feature information stored in the SRAM, so that the image formation control unit generates key information according to the feature information. In this way, in the embodiment of the present application, the key information is generated by using the feature information stored in the SRAM. Since the characteristic information stored by the SRAM is related to the chip production process and procedure, the specific values of the characteristic information stored by the SRAM of different consumable chips are different. Meanwhile, due to the influence of environmental factors such as power supply voltage and noise of the consumable chip, the specific value of the consumable chip shows certain randomness after being electrified every time and is not a fixed value, the probability that illegal molecules acquire characteristic information stored by the SRAM and directly generate a correct key is greatly reduced, the key information is not stored in any fixed nonvolatile memory, the illegal molecules cannot directly read data stored in the nonvolatile memory to directly acquire the key information, and the safety and reliability of the data are improved. Moreover, the consumable chip does not need to have the function of generating the key information, so that the cost is saved, and the stability is high. The details will be described below.
In the embodiment of the present application, the image forming apparatus is used to execute image forming jobs such as generating, printing, receiving, and transmitting image data, and examples of the image forming apparatus include: an inkjet printer, a laser printer, an LED (Light Emitting Diode) printer, a copier, a scanner, or a multifunction Peripheral (MFP) that performs the above functions in a single device.
The image forming apparatus includes an image forming control unit for controlling the image forming apparatus as a whole, and an image forming section for forming an image on a sheet of paper conveyed under the control of the image forming control unit based on image data, wherein the image forming control unit may be a System on Chip (SoC) which is a micro System composed of a plurality of System components and configured to control an image forming processing operation of the image forming apparatus, such as processing of linear correction, noise reduction, dead pixel removal, detail enhancement, etc., on the image data, thereby improving the quality of image output, and the image forming control unit may be further configured to perform processing operations related to data transmission and reception, command transmission and reception, engine control of printing an image, such as processing operations related to data transmission and reception through an interface unit (including but not limited to a USB port, and a USB port, and a communication port, and a communication port, and a communication port, and a communication port, and a communication port, and a communication port, and a communication port, a wired network port, a wireless network port, or other interface, etc.) to transmit and receive data, print engine control commands, status, etc. Fig. 2 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present disclosure. As shown in fig. 2, as an example of an image forming apparatus, an image forming section of the image forming apparatus may include: a developer accommodating portion 11, a developing member 12, a developer conveying member 13, a photosensitive member 14, a transfer member 15, a fixing assembly 5 and the like, wherein a paper to be printed moves along a paper feeding direction, sequentially passes through a powder feeding operation of the developer conveying member 13 and a developing operation of the developing member 12, reaches a clamping area between the photosensitive member 14 and the transfer member 15 for transfer, and then passes through the fixing assembly 5 for fixing to complete an image forming operation, wherein the developer accommodating portion 11 is used for accommodating a developer which can be a material such as carbon powder and toner; the photosensitive member 14 includes: a photosensitive drum (OPC), a charging roller for charging the photosensitive drum, and the like; the developing part 12 may include a developing roller or the like for conveying the developer to the photosensitive drum; the developer conveying member 13 may include a powder feeding roller or the like for conveying the developer to the developing part 12, or may be replaced with a member such as a powder feeding screw or the like.
Generally, at least one consumable is detachably installed in the image forming apparatus, and taking the image forming apparatus shown in fig. 2 as an example, the image forming apparatus is detachably installed with 4 consumables (consumable 1, consumable 2, consumable 3 and consumable 4 shown in fig. 1, respectively, and the 4 consumables are respectively used for providing the image forming apparatus with developers of four colors, namely black K, cyan C, magenta M and yellow Y). The application is mainly applied to scenes that the number of consumables installed in the image forming device is greater than or equal to 2.
The chip is specifically a circuit substrate mounted on the consumable, the circuit substrate including a storage device and an electrical contact connected to the storage device, the contact being for electrical connection with an electrical contact on the image forming apparatus side.
Fig. 3 is a schematic flow chart of a method for protecting data according to an embodiment of the present application. The embodiment of the method is applied to the interaction between the consumable chip on the consumable in the image forming device shown in the figure 2 and the image forming control unit. The method comprises the following steps:
step S301, the image formation control unit sends request information of the feature information stored in the SRAM to the consumable chip, and the consumable chip receives the request information of the feature information stored in the SRAM.
It should be noted that, some differences are physically formed in the manufacturing process of the transistors constituting the memory cell due to factors such as processes and materials, which cause different threshold voltages of different transistors, so that a unique electrical fingerprint characteristic is formed when a plurality of transistors constitute the SRAM memory cell, where the fingerprint characteristic is a trend of the storage content of a single SRAM memory cell when the SRAM memory cell is powered on. Embodied as a single SRAM cell tends to three states at power up: the stable tendency "0", the stable tendency "1", and the unstable state, when the single SRAM memory cell is in the unstable state when being powered on, may be represented as "0" or "1" by the influence of the environmental factors.
Based on this, in the embodiment of the present application, the key information may be generated using the electrical fingerprint characteristics of the storage unit of the SRAM. Therefore, key information does not need to be stored in the consumable chip, and the image forming control unit of the image forming device can directly acquire the electrical fingerprint characteristics of the storage unit of the SRAM from the consumable chip to generate the key information, so that the data security is improved. Moreover, the electrical fingerprint characteristics of the storage unit of the SRAM are different due to different environmental factors such as the power supply voltage and noise of the consumable chip after the SRAM is powered on every time, so that the probability that illegal molecules acquire the key information by acquiring the characteristic information is greatly reduced.
In the embodiment of the present application, when the image formation control unit in the image forming apparatus needs to generate the key information, since the key information is generated according to the electrical fingerprint characteristics of the storage unit of the SRAM, the image formation control unit needs to first acquire the electrical fingerprint characteristics of a part of the storage unit from the SRAM. The SRAM is arranged in the consumable chip, and the image forming control unit needs to send request information for acquiring the characteristic information stored in the SRAM to the consumable chip. The consumable chip receives request information for acquiring the characteristic information stored in the SRAM.
Step S302, the consumable chip sends the feature information stored in the SRAM to the image forming control unit based on the received request information, and the image forming control unit receives the feature information sent by the consumable chip and generates key information according to the feature information.
In the embodiment of the application, after the consumable chip receives the request message sent by the image formation control unit for acquiring the feature information stored in the SRAM, the electrical fingerprint features of at least part of the storage units of the SRAM can be determined as the feature information, so that the stored feature information can be acquired from the SRAM and sent to the image formation control unit.
After receiving the feature information sent by the consumable chip, the image formation control unit may generate key information according to the feature information, for example, may perform a hash algorithm on the feature information to obtain the key information. Alternatively, the key information may be formed by performing a combination process or the like on the feature information, and it is needless to say that other processes may be performed to obtain the key information.
As a possible implementation manner, in order to improve the accuracy of the acquired feature information, the generating of the key information by the image formation control unit according to the feature information includes: the image formation control unit generates key information from the at least twice feature information.
That is, the characteristic information stored in the SRAM is related to environmental factors, processes, materials, and the like during the manufacturing process of transistors constituting the memory cells of the SRAM, and the values thereof are not completely the same after each power-on. In order to improve the accuracy and stability of the key information, the image formation control unit may acquire the feature information generation key information at least twice.
As a possible implementation manner, after the image formation control unit obtains the feature information at least twice, the image formation control unit may obtain the target feature information by using a FERNS (Random FERNS) algorithm; and generating key information according to the target characteristic information.
That is, the image formation control unit may acquire the target feature information according to the at least two times of feature information by using the FERNS algorithm after acquiring the at least two times of feature information, and the image formation control unit may generate the key information according to the target feature information after acquiring the target feature information.
As a possible implementation manner, the feature information is specifically used for generating the key information in combination with the attribute information of the consumable chip. That is, when the image formation control unit generates the key information according to the feature information, the key information may be generated by combining the attribute information of the consumable chip, for example, the key information may be generated by combining the feature information with the serial number of the consumable chip, and of course, other attribute information of the consumable chip may also be combined, which is not limited in this application.
In this way, in the embodiment of the present application, the key information is generated by using the feature information stored in the SRAM. Because the characteristic information stored in the SRAM is related to environmental factors, processes, materials and other factors in the production and manufacturing process of transistors forming a storage unit of the SRAM, and the specific value of the characteristic information is not a fixed value, the probability that illegal molecules acquire the characteristic information stored in the SRAM is greatly reduced, correct keys are directly generated, and the safety and the reliability of data are improved. Moreover, the consumable chip does not need to have the function of generating the key information, so that the cost is saved, and the stability is high.
Fig. 4 is a schematic flow chart of another data protection method provided in the embodiment of the present application. The embodiment of the method is applied to the interaction between the consumable chip on the consumable in the image forming device shown in the figure 2 and the image forming control unit. Compared with the embodiment shown in fig. 3, the embodiment of the present application adds relevant steps for making the consumable chip enter the SRAM feature extraction mode, and the method includes:
step S401, the image forming control unit sends a first control instruction to the consumable chip. The consumable chip receives a first control instruction.
The first control instruction is used for instructing the consumable chip to enter an SRAM feature extraction mode. The SRAM feature extraction mode is a mode of the consumable chip that at least prohibits writing of data to a storage unit for storing feature information in the SRAM.
In this embodiment, in order to prevent illegal molecules from tampering with the feature information stored in the SRAM during the process of acquiring the feature information by the image formation control unit, the image formation control unit may send a first control instruction to the consumable chip, so that the consumable chip enters the SRAM feature extraction mode. The consumable chip receives a first control instruction.
And S402, the consumable chip enters an SRAM feature extraction mode according to the first control instruction, and when the consumable chip is in the SRAM feature extraction mode, the consumable chip refuses to respond to a data writing instruction for writing data into a storage unit used for storing feature information in the SRAM.
In the embodiment of the application, the consumable chip enters the SRAM feature extraction mode after receiving the first control instruction, and at this time, when the consumable chip is in the SRAM feature extraction mode, data is prohibited from being written into the storage unit for storing the feature information in the SRAM, so that the feature information stored in the SRAM can be prevented from being tampered. Therefore, the consumable chip rejects the data writing instruction in response to writing data to the storage unit for storing the characteristic information in the SRAM.
In one possible implementation manner, the consumable chip stores the identification information of the SRAM feature extraction mode as the mode information of the SRAM in the nonvolatile memory. Therefore, when the consumable chip is restarted, the mode information of the SRAM stored in the nonvolatile memory can be read to obtain the identification information of the SRAM feature extraction mode, and then the consumable chip enters the SRAM feature extraction mode.
Further, the nonvolatile memory includes a FLASH memory (FLASH).
Step S403, the image forming control unit turns off the power supply of the consumable chip, turns on the power supply of the consumable chip after a preset time interval, and restarts the consumable chip. In the embodiment of the application, in order that the acquired feature information is not tampered, the image formation control unit may restart the consumable chip after sending the first control instruction to the consumable chip to enable the consumable chip to enter the SRAM feature extraction mode. At this moment, the image formation control unit can close the power of consumptive material chip, stops to supply power for the consumptive material chip to after interval preset time, restart the power of consumptive material chip, for the power supply of consumptive material chip again, make the consumptive material chip start. After the consumable chip is restarted, the characteristic information stored in the SRAM in the consumable chip is updated accordingly.
In a possible implementation manner, after the consumable chip is restarted, the mode information of the SRAM may be read from the nonvolatile memory, and if the mode information of the SRAM is the identification information of the SRAM feature extraction mode, the consumable chip enters the SRAM feature extraction mode.
In one possible embodiment, the image formation control unit may control the power supply to the consumable chip by providing a switching circuit between the consumable chip and the power supply, and the image formation control unit controls the switching circuit to be turned on and off so as to control whether the consumable chip is powered. Referring to fig. 5, the circuit for controlling the supply of power to the consumable chip by the image formation control unit includes: a first resistor R1, a second resistor R2, and a seventh transistor T7. The first end of the image forming control unit is connected with the first end of the consumable chip through a Universal Asynchronous Receiver/Transmitter (UART) bus so as to perform data communication. A second terminal of the image formation control unit is connected to one terminal of the first resistor R1, and the other terminal of the first resistor R1 is connected to the gate of the seventh transistor T7. The source of the seventh transistor T7 is connected to the power supply, and the drain of the seventh transistor is connected to the second end of the consumable chip. The drain of the seventh crystal T7 is also connected to one end of a second resistor R2, and the other end of the second resistor R2 is grounded. And the third end of the consumable chip is grounded.
In the embodiment of the present application, through the above-described circuit, the image formation control unit may send a control signal through the first terminal thereof so as to control the turn-off and turn-on of the seventh transistor T7. When the image forming control unit needs to start the power supply of the consumable chip, the control pin of the main control chip outputs a high level signal, at the moment, after the gate of the seventh transistor T7 receives the high level signal, the seventh transistor T7 is conducted, so that a path between the power supply and the power supply pin of the consumable chip is conducted, and the power supply connected with the source electrode of the seventh transistor T7 supplies power to the consumable chip. When the image forming control unit needs to turn off the power supply of the consumable chip, the first end of the image forming control unit outputs a low level signal, at the moment, after the grid of the seventh transistor T7 receives the low level signal, the seventh transistor T7 is disconnected, and then the path between the power supply and the second end of the consumable chip is disconnected, so that the consumable chip is powered off.
Thus, through the circuit, the image forming control unit can control the on and off of the power supply of the consumable chip, so that the characteristic information stored in the SRAM in the consumable chip can be updated.
Generally speaking, a switch circuit is arranged between the power supply and the consumable chip, and the on and off of the switch circuit are controlled according to the control signal output by the image forming control unit, so that the power supply or the power off of the consumable chip are realized.
Fig. 5 shows an embodiment, and those skilled in the art can realize the above functions by using other forms of switch circuits, which are not limited herein.
It should be noted that the preset time is preset according to actual requirements, and is an interval time between stopping supplying power to the consumable chip and re-supplying power to the consumable chip, which is not limited in the present application.
In step S404, the image formation control unit sends request information of the feature information stored in the SRAM to the consumable chip. The consumable chip receives request information of the characteristic information stored in the SRAM.
Specifically, the step S301 may be referred to and will not be described herein again.
Step S405, the consumable chip sends the feature information stored in the SRAM to the image formation control unit based on the received request information. The image forming control unit receives the characteristic information sent by the consumable chip and generates key information according to the characteristic information.
In the embodiment of the application, the image forming control unit can generate the key information according to the characteristic information after receiving the characteristic information sent by the consumable chip. For accuracy of the acquired key information, the image formation control unit may acquire the plural times of the feature information and generate the key information from the acquired plural times of the feature information. Since the feature information of the SRAM can be updated only when the consumable chip is restarted, the image formation control unit may restart the consumable chip before obtaining the feature information each time, that is, re-execute step S403.
For example, the image formation control unit needs to generate key information from the 8-time feature information. At this time, the image formation control unit needs to acquire 8 this feature information. The image forming control unit can turn off the power supply of the consumable chip, turn on the power supply of the consumable chip after 5s, and restart the consumable chip. The consumable chip acquires the mode information of the SRAM from the flash memory, and enters the SRAM feature extraction mode if the mode information of the SRAM is the identification information of the SRAM feature extraction mode. The image formation control unit sends request information of the characteristic information stored in the SRAM to the consumable chip, and the consumable chip receives the request information of the characteristic information stored in the SRAM. The consumable chip transmits the feature information stored in the SRAM to the image formation control unit based on the received request message. The image formation control unit acquires primary feature information. And the image forming control unit executes the power supply for closing the consumable chip again, starts the power supply for the consumable chip after the interval of 5s, and restarts the consumable chip until the characteristic information is acquired for 8 times. After acquiring the 8-time feature information, the image formation control unit may acquire target feature information by using a FERNS algorithm according to the acquired 8-time feature information, and generate key information according to the target feature information.
Fig. 6 is a schematic flow chart of another data protection method provided in the embodiment of the present application. The embodiment of the method is applied to the interaction between the consumable chip on the consumable in the image forming device shown in the figure 2 and the image forming control unit. In the embodiment of the present application, compared to the embodiment shown in fig. 4, the method adds relevant steps of storing ciphertext data and causing the consumable chip to exit the SRAM feature extraction mode, and includes:
step S601, the image forming control unit sends a first control instruction to the consumable chip. The consumable chip receives a first control instruction.
The detailed description of step S401 is omitted here.
And step S602, the consumable chip enters an SRAM feature extraction mode according to the first control instruction, and when the consumable chip is in the SRAM feature extraction mode, data are prohibited to be written into a storage unit used for storing feature information in the SRAM.
The detailed description of step S402 is omitted here.
Step S603, the image formation control unit turns off the power supply of the consumable chip, turns on the power supply of the consumable chip after a preset time interval, and restarts the consumable chip.
The detailed description of step S403 is omitted here.
In step S604, the image formation control unit sends request information of the feature information stored in the SRAM to the consumable chip. The consumable chip receives request information of the characteristic information stored in the SRAM.
The detailed description of step S404 is omitted here.
Step S605, the consumable chip sends the feature information stored in the SRAM to the image formation control unit based on the received request information. The image forming control unit receives the characteristic information sent by the consumable chip and generates key information according to the characteristic information.
The detailed description of step S405 is omitted here.
And step S606, the image forming control unit encrypts the data to be stored based on the key information to generate ciphertext data and sends the ciphertext data to the consumable chip. The consumable chip receives ciphertext data generated based on the key information and stores the ciphertext data.
In this embodiment of the application, after the image formation control unit generates the key information, the image formation control unit may encrypt the data to be stored to generate ciphertext data, and send the ciphertext data to the consumable chip. And after receiving the ciphertext data, the consumable chip stores the ciphertext data. For example, the ciphertext data may be stored in SRAM, or the ciphertext data may be stored in non-volatile memory.
In step S607, the image formation control unit sends a second control command to the consumable chip. And the consumable chip receives a second control instruction.
And the second control instruction is used for indicating the consumable chip to exit the SRAM feature extraction mode.
In this embodiment of the application, after the image formation control unit obtains the feature information, the image formation control unit may send a second control instruction to the consumable chip, so that the consumable chip exits the SRAM feature extraction mode.
And step S608, the consumable chip exits the SRAM feature extraction mode according to the second control instruction.
In this embodiment of the application, after receiving the second control instruction, the consumable chip may exit the SRAM feature extraction mode according to the second control instruction.
In this way, in the embodiment of the present application, the key information is generated by using the feature information stored in the SRAM. Because the characteristic information stored in the SRAM is related to environmental factors, processes, materials and other factors in the production and manufacturing process of transistors forming a storage unit of the SRAM, and the specific value of the characteristic information is not a fixed value, the probability that illegal molecules acquire the characteristic information stored in the SRAM is greatly reduced, correct keys are directly generated, and the safety and the reliability of data are improved. Moreover, the consumable chip does not need to have the function of generating the key information, so that the cost is saved, and the stability is high.
Fig. 7 is a schematic structural diagram of a consumable chip according to an embodiment of the present disclosure. The consumable chip of this application embodiment can install on the consumptive material, the consumptive material can detachably install on image forming device, as shown in FIG. 7, the consumable chip includes:
and the static random access memory SRAM701 is used for storing data.
A chip control unit 702, configured to receive request information of feature information stored in the SRAM701, and send the feature information stored in the SRAM701 to the image formation control unit based on the received request information, where the feature information is used to generate key information.
In a possible implementation manner, the chip control unit 702 is further configured to receive a first control instruction, enter the SRAM701 feature extraction mode according to the first control instruction, and when the consumable chip is in the SRAM701 feature extraction mode, the chip control unit 702 is specifically configured to reject a data write instruction in response to writing data in a storage unit in the SRAM701, the storage unit being used for storing feature information.
In a possible implementation manner, the chip control unit 702 is further configured to receive ciphertext data generated based on the key information, and store the ciphertext data.
In a possible implementation manner, the chip control unit 702 is further configured to receive a second control instruction, and exit the SRAM701 feature extraction mode according to the second control instruction.
In one possible implementation, the characteristic information is used to generate key information in combination with attribute information of the consumable chip.
Referring to fig. 8, a schematic structural diagram of a consumable provided in an embodiment of the present application is shown. As shown in fig. 8, a consumable according to an embodiment of the present application includes:
a housing 801; a developer accommodating portion 802 located inside the housing 801 for accommodating a developer; and the consumable chip 803 of the above embodiments.
It should be noted that, the specific structure of the consumable according to the embodiment of the present application may refer to fig. 2 described above, and is not described herein again.
In one possible implementation, as shown in fig. 9, the consumable further includes: a developer conveying member 804 for conveying the developer.
In a possible implementation manner, as described with reference to fig. 9, the consumable further includes:
a photosensitive drum 805;
a charging roller 806 for charging the photosensitive drum 805.
Referring to fig. 10, a schematic structural diagram of a consumable provided in an embodiment of the present application is shown. As shown in fig. 10, a consumable according to an embodiment of the present application includes:
a photosensitive drum 1001;
a charging roller 1002 for charging 1001 the photosensitive drum; and
the consumable chip 1003 described in the above embodiments.
It should be noted that, the specific structure of the consumable according to the embodiment of the present application may refer to fig. 2 described above, and is not described herein again.
Fig. 11 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present disclosure. As shown in fig. 11, an image forming apparatus according to an embodiment of the present application includes: the consumable 1101 is provided with a consumable chip 1102, and the consumable chip 1102 comprises a chip control unit 1103 and a static random access memory SRAM 1104.
An image formation control unit 1105 for sending request information of the feature information stored in the SRAM1104 to the consumable chip 1103.
A chip control unit 1103 for receiving request information of the feature information stored in the SRAM1103, and sending the feature information stored in the SRAM1104 to the image formation control unit 1105 based on the received request information.
The image formation control unit 1105 is also configured to receive the feature information sent by the consumable chip 1103 and generate key information based on the feature information.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, as for the device embodiment and the terminal embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the description in the method embodiment.
Claims (15)
1. A method for protecting data is applied to a consumable chip, the consumable chip is installed on a consumable, the consumable is detachably installed on an image forming device, the image forming device comprises an image forming control unit, the consumable chip comprises a Static Random Access Memory (SRAM), and the method is characterized by comprising the following steps:
receiving request information of the characteristic information stored in the SRAM;
transmitting feature information stored in the SRAM to the image formation control unit based on the received request information, the feature information being used to generate key information.
2. The method according to claim 1, wherein the transmitting, to the image formation control unit, the feature information stored in the SRAM based on the received request information, before the feature information is used to generate key information, further comprises:
receiving a first control instruction;
and entering an SRAM feature extraction mode according to the first control instruction, and refusing to respond to a data writing instruction for writing data into a storage unit used for storing the feature information in the SRAM when the consumable chip is in the SRAM feature extraction mode.
3. The method of claim 1, further comprising:
and receiving ciphertext data generated based on the key information, and storing the ciphertext data.
4. The method of claim 2, further comprising:
receiving a second control instruction;
and exiting the SRAM feature extraction mode according to the second control instruction.
5. The method according to any of claims 1 to 4, wherein the characteristic information is specifically used for generating the key information in combination with attribute information of the consumable chip.
6. A consumable chip mountable on a consumable detachably mountable on an image forming apparatus, the consumable chip comprising:
a Static Random Access Memory (SRAM);
and the chip control unit is used for receiving the request information of the characteristic information stored in the SRAM and sending the characteristic information stored in the SRAM to the image forming control unit based on the received request information, wherein the characteristic information is used for generating key information.
7. The consumable chip of claim 6,
the chip control unit is further configured to receive a first control instruction, enter an SRAM feature extraction mode according to the first control instruction, and when the consumable chip is in the SRAM feature extraction mode, the chip control unit is specifically configured to reject a data write instruction for responding to write data to a storage unit in the SRAM, where the storage unit is used to store the feature information.
8. The consumable chip of claim 6,
the chip control unit is further configured to receive ciphertext data generated based on the key information, and store the ciphertext data.
9. The consumable chip of claim 7,
and the chip control unit is also used for receiving a second control instruction and exiting the SRAM feature extraction mode according to the second control instruction.
10. The consumable chip of any one of claims 6-9, wherein the characteristic information is used to generate the key information in combination with attribute information of the consumable chip.
11. A consumable, comprising:
a housing;
a developer accommodating portion, located within the housing, for accommodating a developer; and
the consumable chip of any of claims 6-10.
12. The consumable according to claim 11, further comprising:
a developer conveying member for conveying the developer.
13. The consumable according to claim 12, further comprising:
a photosensitive drum;
a charging roller for charging the photosensitive drum.
14. A consumable, characterized in that it comprises:
a photosensitive drum;
a charging roller for charging the photosensitive drum; and
the consumable chip of any of claims 6-10.
15. An image forming apparatus, comprising: the system comprises a consumable, a controller and a controller, wherein a consumable chip is installed on the consumable and comprises a chip control unit and a Static Random Access Memory (SRAM);
the image forming control unit is used for sending request information of the characteristic information stored in the SRAM to the consumable chip;
a chip control unit configured to receive request information of the feature information stored in the SRAM, and send the feature information stored in the SRAM to the image formation control unit based on the received request information;
the image forming control unit is further used for receiving the characteristic information sent by the consumable chip and generating key information based on the characteristic information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111576907.9A CN114236999A (en) | 2021-12-22 | 2021-12-22 | Data protection method, consumable chip, consumable and image forming device |
| PCT/CN2022/140334 WO2023116686A1 (en) | 2021-12-22 | 2022-12-20 | Data protection method, consumable chip, consumable, and image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111576907.9A CN114236999A (en) | 2021-12-22 | 2021-12-22 | Data protection method, consumable chip, consumable and image forming device |
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| CN114236999A true CN114236999A (en) | 2022-03-25 |
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| CN202111576907.9A Pending CN114236999A (en) | 2021-12-22 | 2021-12-22 | Data protection method, consumable chip, consumable and image forming device |
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| WO (1) | WO2023116686A1 (en) |
Cited By (1)
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| WO2023116686A1 (en) * | 2021-12-22 | 2023-06-29 | 珠海奔图电子有限公司 | Data protection method, consumable chip, consumable, and image forming apparatus |
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