Patent Publication Number: US-2023135115-A1

Title: Consumable chip and consumable chip response method, consumable cartridge, and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Patent Application PCT/CN2021/115131, filed on Aug. 27, 2021, which claims priority to Chinese Patent Application No. 202010615229.1, filed with the China National Intellectual Property Administration on Jun. 30, 2020, and entitled “CONSUMABLE CHIP AND RESPONDING METHOD FOR CONSUMABLE CHIP”, all of which is incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     Embodiments of this application relate to the field of office consumables, and in particular, to a consumable chip, a responding method for a consumable chip, a consumable cartridge, and a storage medium. 
     BACKGROUND 
     A printing device is an indispensable device in modern life. In a printing process, a consumable cartridge such as an ink cartridge and a toner cartridge is required. To record use of a consumable cartridge installed to the printing device, a removable consumable chip, such as a toner cartridge chip, is installed on the ink cartridge or the toner cartridge. The toner cartridge chip is configured to store data related to the toner cartridge, such as a toner color, a remaining toner quantity, a page output (a maximum value of a quantity of pages that can be printed), a quantity of printed pages, a manufacturer, and a production date. 
     When the consumable chip communicates with the printing device, the printing device needs to verify whether the consumable chip is authentic and trustworthy. Therefore, a digital signature is generally stored in the consumable chip. When the digital signature is verified, it can indicate that the consumable chip is authentic and trustworthy. In some cases, when the consumable chip does not store a digital signature, the printing device also needs to communicate with the consumable chip. For example, a consumable chip on an original consumable cartridge is used, and a digital signature stored in the consumable chip is used to indicate that the consumable cartridge is produced by a preset manufacturer. If the consumable chip on the consumable cartridge is produced by a third party, there is usually no digital signature information in the consumable chip. In this case, the printing device still needs to allow the consumable cartridge produced by the third party that does not have a digital signature to be used. Therefore, the printing device needs to be able to determine whether the consumable chip has digital signature information. If there is digital signature information, the printing device verifies the digital signature, so as to determine authenticity of the consumable chip. If there is no digital signature information in the consumable chip, the printing device does not verify the digital signature information. 
     Currently, when a digital signature and unsigned data of a consumable chip are stored, two parts are generally stored, and the first part stores an indicator. This indicator can tell the printing device a data type stored in the consumable chip, such as a signed data type or an unsigned data type, and the other part stores indicated signature data or unsigned data. The printing device can determine, by using this indicator, whether a digital signature exists in the consumable chip, so as to determine whether the digital signature needs to be verified. However, in this manner, a part needs to be specially disposed in the consumable chip to store an indicator, and the indicator is easily obtained by another third party. After this indicator is obtained, the another third party easily learns of a signature status of data in the consumable chip, thereby reducing chip security. 
     SUMMARY 
     Embodiments of this application provide a consumable chip, a responding method for a consumable chip, a consumable cartridge, and a storage medium, to resolve a technical problem in the prior art that another third party easily learns of a signature status of data in the consumable chip, thereby reducing chip security. 
     According to a first aspect, an embodiment of this application provides a responding method for a consumable chip, where the consumable chip stores target data and an indicator used to indicate a type of the target data in the consumable chip, and at least a part of data in the target data is used as the indicator; and the target data is a digital signature or unsigned data; and the method includes: 
     receiving an access request of a printing device; 
     selecting at least a part of data in the target data according to the access request; and 
     sending the at least a part of data to the printing device in response to the access request of the printing device. 
     Optionally, according to the foregoing method, the entire indicator is included in the target data. 
     Optionally, according to the foregoing method, the indicator is data of a fixed address in the target data. 
     Optionally, according to the foregoing method, the indicator is data of multiple different addresses in the target data or common information of data of the multiple different addresses. 
     Optionally, according to the foregoing method, the indicator is data selected from any address whose value is a preset value in the target data. 
     Optionally, according to the foregoing method, at least a part of data in the target data and data outside the target data are jointly used as the indicator of the type of the target data to respond to the access request of the printing device. 
     Optionally, according to the foregoing method, the method further includes: 
     receiving an access request of the printing device for the target data; and 
     sending the target data to the printing device to respond to the access request of the printing device for the target data. 
     According to a second aspect, an embodiment of this application provides a consumable chip, including: 
     a storage module, configured to store target data and an indicator used to indicate a type of the target data in the consumable chip, where at least a part of data in the target data is used as the indicator; and the target data is a digital signature or unsigned data. 
     Optionally, the foregoing consumable chip further includes: 
     a receiving module, configured to receive an access request of a printing device; 
     a selection module, configured to select at least a part of data in the target data according to the access request; and 
     a sending module, configured to send the at least a part of data to the printing device in response to the access request of the printing device. 
     Optionally, according to the foregoing consumable chip, the entire indicator is included in the target data. 
     Optionally, according to the foregoing consumable chip, the indicator is data of a fixed address in the target data. 
     Optionally, according to the foregoing consumable chip, the indicator is data of multiple different addresses in the target data or common information of data of the multiple different addresses. 
     Optionally, according to the foregoing consumable chip, the indicator is data randomly selected from different addresses whose values are a preset value in the target data. 
     Optionally, according to the foregoing consumable chip, at least a part of data in the target data and data outside the target data are jointly used as the indicator. 
     Optionally, according to the foregoing consumable chip, 
     the receiving module is further configured to receive an access request of the printing device for the target data; and 
     the sending module is further configured to send the target data to the printing device to respond to the access request of the printing device for the target data. 
     According to a third aspect, an embodiment of this application provides a consumable chip, including: 
     a memory, a processor, and a computer program; 
     where the computer program is stored in the memory, and is configured to be executed by the processor to implement the method according to any one of the disclosed responding methods. 
     According to a fourth aspect, an embodiment of this application provides a computer readable storage medium, where a computer program is stored thereon, and the computer program is executed by a processor to implement the method according to any one of the disclosed responding methods. 
     According to a fifth aspect, an embodiment of this application provides a consumable cartridge, where the consumable cartridge includes the consumable chip disclosed herein, and the consumable chip is detachably mounted on the consumable cartridge. 
     According to a sixth aspect, an embodiment of this application provides a chip for running an instruction, where the chip includes a memory and a processor, the memory stores code and data, the memory is coupled to the processor, and the processor runs the code in the memory, so that the chip is configured to perform the responding method for a consumable chip according to the disclosed responding methods. 
     According to a seventh aspect, an embodiment of this application provides a program product including an instruction, where when the program product runs on a computer, the computer performs the responding method for a consumable chip according to the disclosed responding methods. 
     According to an eighth aspect, an embodiment of this application provides a computer program, where when the computer program is executed by a processor, the computer program is configured to perform the responding method for a consumable chip according to the disclosed responding methods. 
     Embodiments of this application provide a consumable chip, a responding method for a consumable chip, a consumable cartridge, and a storage medium. Target data and an indicator used to indicate a type of the target data in the consumable chip are stored, where at least a part of data in the target data is used as the indicator. The target data is a digital signature or unsigned data. An access request of a printing device for the indicator is received; at least a part of data in the target data is selected according to the access request; and the at least a part of data is sent to the printing device to respond to the access request of the printing device for the indicator. Because a part of data in the digital signature or the unsigned data represents an indicator of a type of the target data in the chip, there is no need to separately set a storage part to store the indicator and fixedly store a position of the indicator. Therefore, when the printing device obtains the indicator of the type of the target data, it is difficult for another third party to learn of a signature status of data in the consumable chip, thereby increasing chip security. 
     It should be understood that content described in the summary part of the present invention is not intended to limit a key or important feature of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application are easily understood by using the following descriptions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of this application or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of this application, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. 
         FIG.  1    is a schematic flowchart of a responding method for a consumable chip according to an embodiment of this application; 
         FIG.  2    is a schematic diagram of data stored in a consumable chip in the prior art; 
         FIG.  3    is a schematic diagram of data stored in a consumable chip according to an embodiment of this application; 
         FIG.  4    is a schematic flowchart of another responding method for a consumable chip according to an embodiment of this application; 
         FIG.  5    is a schematic diagram of data stored in another consumable chip according to an embodiment of this application; 
         FIG.  6    is a schematic diagram of data stored in still another consumable chip according to an embodiment of this application; 
         FIG.  7    is a schematic structural diagram of a consumable chip according to an embodiment of this application; and 
         FIG.  8    is a schematic structural diagram of another consumable chip according to an embodiment of this application. 
     
    
    
     DETAILED DESCRIPTION 
     The following clearly and completely describes the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are merely some but not all of the embodiments of this application. The components of the embodiments of this application, which are generally described and illustrated in the accompanying drawings herein, may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application, but merely represents the selected embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the protection scope of this application. 
     It should be noted that similar reference numerals and letters denote similar items in the following accompanying drawings, and therefore, once a particular item is defined in one of the accompanying drawings, no further definition or interpretation is required in the subsequent accompanying drawings. 
     The following specifically describes the embodiments of this application with reference to the accompanying drawings. 
     Embodiment 1 
       FIG.  1    is a schematic flowchart of a responding method for a consumable chip according to an embodiment of this application. As shown in  FIG.  1   , an execution body of this embodiment of this application is a consumable chip, which may be specifically a responding apparatus for a consumable chip. The responding apparatus for a consumable chip may be integrated into the consumable chip. The consumable chip stores target data and an indicator (indicator) that is used to indicate a type of target data in the consumable chip. At least a part of data in the target data is used as the indicator. The target data is a digital signature or unsigned data; The responding method for a consumable chip provided in this embodiment includes the following several steps. 
     Step  101 : Store target data and an indicator used to indicate a type of the target data in the consumable chip, where at least a part of data in the target data is used as the indicator; and the target data is a digital signature or unsigned data. In this embodiment, the consumable chip may store the digital signature or the unsigned data in a memory. 
     The definition and generation method of the digital signature are disclosed in U.S. Pat. No. 5,231,668, and details are not described herein again. 
     In this embodiment, if the digital signature is stored in the consumable chip, in addition to the digital signature, the indicator used to indicate that the digital signature is stored in the consumable chip, that is, the indicator indicating that the type of the target data is a digital signature is stored, and at least a part of data in the digital signature is used as the indicator indicating that a digital signature is stored. If the consumable chip stores the unsigned data, in addition to the unsigned data, an indicator indicating that the consumable chip does not store the digital signature is stored, that is, an indicator indicating that the type of the target data is the unsigned data is stored, and at least a part of the unsigned data is used as an indicator indicating that the digital signature is not stored. It can be learned that the indicator used to indicate that the digital signature is stored in the consumable chip and the indicator used to indicate that the digital signature is not stored in the consumable chip are indicators used to indicate the type of the target data, and the type of the target data includes the type of the digital signature or the type of the unsigned data. 
     The indicator used to indicate the type of the target data in the consumable chip may be one byte (byte) or more bytes of data, or may be one bit (bit) or more bits of data. 
     It may be understood that values of the indicator used to indicate that the digital signature is stored in the consumable chip and the indicator used to indicate that the digital signature is not stored in the consumable chip indicate indicators of types of different target data are different. For example, in a consumable chip that stores a digital signature, that is, when it indicates that a type of target data is a digital signature, a value of an indicator is 0x11. In a consumable chip that does not store a digital signature, that is, when it indicates that a type of target data is unsigned data, a value of an indicator is 0x22. 
     An example in which the target data is a digital signature, that is, a digital signature is stored is used to describe an indicator that is used to indicate that a digital signature is stored in a consumable chip and that indicates that the target data is a digital signature. 
     For example,  FIG.  2    shows a consumable chip including a digital signature and an indicator thereof in the prior art, and the digital signature includes 8 bytes, and is denoted by a hexadecimal digit in the figure. The indicator is one byte, a value in the figure is “11”, and it can be learned that the digital signature and the indicator are separately stored in different positions/addresses of the consumable chip. In this embodiment, as shown in  FIG.  3   , instead of separately storing data used as an indicator, when a printing device requests to access the indicator, the consumable chip selects, from the digital signature, a value “11” that may indicate that the consumable chip stores a digital signature, for example, a seventh byte of the digital signature in  FIG.  3   , and send the value to the printing device as a response to the access request. 
     Step  102 : Receive an access request of a printing device for the indicator. 
     In this embodiment, the printing device communicates with the consumable chip. A specific communication manner is not limited in this embodiment. 
     Specifically, in this embodiment, when the printing device needs to determine whether the consumable chip has digital signature information, if the consumable chip has the digital signature information, the printing device verifies the digital signature to determine authenticity of the consumable chip. If there is no digital signature information in the consumable chip, that is, the consumable chip stores unsigned data, the printing device does not verify the digital signature. Therefore, the printing device sends the access request for the indicator to the consumable chip, and the consumable chip receives the access request for the indicator. 
     The printing device may send an access request for a specific address (for example, an address for storing the indicator) to the consumable chip, or may send an access request for continuously accessing multiple addresses, where the multiple addresses may include the address of the indicator. Therefore, the access request sent by the printing device does not necessarily directly indicate that the indicator needs to be accessed. The consumable chip may return the value of the indicator when receiving another access request of the printing device. 
     Step  103 : Select at least a part of data in the target data according to the access request. 
     In this embodiment, because the consumable chip pre-stores the indicator used to indicate the type of the target data in the consumable chip, at least a part of data in the target data is used as the indicator during storage, a storage manner of the indicator in the target data is determined according to the access request, and a corresponding at least a part of data in the target data is selected according to the storage manner of the indicator as the indicator. 
     Step  104 : Send the at least a part of data to the printing device to respond to the access request of the printing device for the indicator. 
     Specifically, in this embodiment, the consumable chip sends at least a part of the target data to the printing device. After obtaining the part of data, the printing device may learn of the type of the target data in the consumable chip, that is, whether digital signature data is stored. Therefore, the consumable chip may select and send at least a part of data in the target data to the printing device to respond to the access request of the printing device. 
     Therefore, with reference to step  101  to step  104 , in this embodiment, when the consumable chip stores the digital signature, a part of data in the digital signature is used as the indicator, so as to indicate that the consumable chip stores the digital signature. When the printing device sends the access request, and requires the consumable chip to send an indicator indicating whether the consumable chip includes digital signature information, the consumable chip sends a part of data in the digital signature to the printing device in response to the access request of the printing device. After obtaining the part of data, the printing device may learn that the consumable chip stores the digital signature data. 
     When no digital signature is stored in the consumable chip, the consumable chip stores unsigned data. When the printing device sends the access request, and requires the consumable chip to send an indicator indicating whether the consumable chip includes digital signature information, that is, an indicator indicating the type of the target data, the consumable chip responds to the access request of the printing device, and sends at least a part of data in the unsigned data to the printing device. After obtaining the part of data, the printing device learns that there is no digital signature data stored in the consumable chip, and the printing device no longer verifies the data signature. 
     In the responding method for a consumable chip provided in this embodiment, target data and an indicator used to indicate a type of the target data in the consumable chip are stored, where at least a part of data in the target data is used as the indicator. The target data is a digital signature or unsigned data. An access request of a printing device for the indicator is received; at least a part of data in the target data is selected according to the access request; and the at least a part of data is sent to the printing device to respond to the access request of the printing device for the indicator. Because a part of data in the digital signature or the unsigned data represents an indicator of a type of the target data in the chip, there is no need to separately set a storage part to store the indicator and fixedly store a position/address of the indicator. Therefore, when the printing device obtains the indicator of the type of the target data, it is difficult for another third party to learn of a signature status of data in the consumable chip, thereby increasing chip security. 
       FIG.  4    is a schematic flowchart of another responding method for a consumable chip according to an embodiment of this application. As shown in  FIG.  4   , the responding method for a consumable chip provided in this embodiment further refines step  101  on the basis of the responding method for a consumable chip provided in Embodiment 1 of this application, and further includes a step of receiving an access request of a printing device for target data, and sending the target data to the printing device, so as to respond to the access request of the printing device for the target data. The responding method for a consumable chip provided in this embodiment includes the following steps: 
     Step  201 : Store target data and an indicator used to indicate a type of the target data in the consumable chip, where at least a part of data in the target data is used as the indicator; and the target data is a digital signature or unsigned data. 
     Optionally, in this embodiment, the entire indicator used to indicate the type of the target data in the consumable chip is included in the target data. 
     In an optional implementation, the indicator used to indicate the type of the target data in the consumable chip is data at a fixed address in the target data. For example, the indicator may be data at an initial address (the first address) in the digital signature or the unsigned data. In this way, when the consumable chip responds to the access request of the printing device, that is, queries whether the indicator of digital signature information is included, the consumable chip may fixedly send the data at the initial address of the digital signature or the unsigned data to the printing device. 
     It should be noted that when the indicator used to indicate the type of the target data in the consumable chip is stored at fixed addresses in the digital signature or unsigned data of the consumable chip, the printing device may also not need to separately send an access request for the indicator used to indicate the type of the target data. The printing device may directly access these fixed addresses and read the data from these addresses. After the printing device reads the data at these addresses, data that is at specific addresses in these addresses and that is used as the indicator is preset in a control program of the printing device. Therefore, the printing device obtains the data used as the indicator at the address, and further knows whether a digital signature is stored in the consumable chip. In this way, the printing device does not send an access request for reading the indicator indicating whether the consumable chip includes digital signature information, but the printing device can also find data representing the indicator in the data. In this way, a third party cannot learn of a digital signature status of the consumable chip by collecting a communication process between the printing device and the consumable chip. 
     In another optional implementation, to enhance security of the consumable chip, the indicator used to indicate the type of the target data in the consumable chip may be data at multiple different addresses in the target data or common information of data at multiple different addresses. 
     Specifically, in this embodiment, data at multiple different addresses in the digital signature or the unsigned data may be separately used as an indicator, and data at these different addresses may have some common information. Therefore, the indicator used to indicate the type of the target data in the consumable chip may be common information of data at multiple different addresses. For example, the highest bits of the data at the different addresses in the digital signature are 1, and the highest bits of the data at the different addresses in the unsigned data are 0. It is assumed that when the indicator is “1”, it indicates that the digital signature exists, and when the indicator is “0”, it indicates that the digital signature does not exist. Therefore, the highest bit may be obtained from any address and used as the indicator. When responding to the printing device&#39;s request about whether digital signature information is included, the consumable chip randomly selects an address from multiple addresses in the digital signature or the unsigned data, and sends data at the selected address to the printing device. After receiving the data, the printing device determines that the highest bit of the data is 1, indicating that the consumable chip stores a digital signature, and further requests digital signature data of the consumable chip. It is determined that the highest bit of the data is 0, indicating that no digital signature is stored in the consumable chip, and digital signature data of the consumable chip is not requested, or a signature/unsigned data read from the consumable chip is not to be verified. 
     Specifically, in this embodiment, the indicator used to indicate the type of the target data in the consumable chip is a combination of data at multiple different addresses in the target data.  FIG.  5    shows a case in which multiple different addresses in a digital signature are used together as an indicator. Because the highest four bits of the second byte of the digital signature in  FIG.  5    are hexadecimal digits  1  and the lowest four bits of the third byte are hexadecimal digits  1 , the consumable chip may combine data from these two different bytes together to form a value “11” to respond to an access request of the printing device. 
     In still another optional implementation, in this embodiment, to further enhance security of the consumable chip, the indicator used to indicate the type of the target data in the consumable chip is data selected from any address whose value is a preset value in the target data. 
     In this optional implementation, for a consumable chip that stores a digital signature and an indicator indicating that a digital signature is stored, the preset value is first determined, for example, the preset value is “1”. Then, a value of the digital signature is determined byte by byte. As shown in  FIG.  5   , after the value of the digital signature is determined byte by byte or by using a randomly selected byte, the highest four bits of the second byte of the digital signature are hexadecimal digits  1 , which are the preset value “1”. Therefore, when it is determined that the value is equal to “1”, it is determined that data at this address is selected as the indicator. Because an address at which the preset value “1” is determined is uncertain, the indicator is obtained by randomly selecting data at any address from the target data. For a consumable chip that stores unsigned data and an indicator indicating that no digital signature is stored (that is, indicates that the type of the target data is unsigned data), a suitable value may be randomly selected from the unsigned data as the indicator in a similar manner, so that a position/address of data used as the indicator does not need to be fixed. Because the value indicating the indicator may be any address in the digital signature or the unsigned data (provided that the value at the address meets a requirement of the indicator, that is, the foregoing preset value), it is difficult for a third party to determine the position of the indicator in the digital signature or the unsigned data, thereby further improving data security. 
     Optionally, in this embodiment, at least a part of data in the target data and data outside the target data are jointly used as the indicator of the type of the target data to respond to the access request of the printing device. 
     Specifically, a person skilled in the art may understand that, in addition to the digital signature and the indicator used to indicate that a digital signature is stored in the consumable chip, other data, such as a color, a remaining quantity, a page output (a maximum value of a quantity of pages that can be printed), a quantity of printed pages, a manufacturer, a production date, and a serial number, may be stored in the consumable chip. Therefore, in another embodiment, a part of data in the digital signature and other data than the digital signature are jointly used as the indicator indicating that a digital signature is stored in the consumable chip. When responding to the printing device&#39;s request whether digital signature information is included, the consumable chip sends the data outside the digital signature and a part of data in the signature to the printing device. For example, as shown in  FIG.  6   , the value “11” of the indicator may be formed by using the lowest-four-digit hexadecimal digits  1  of the third byte in the digital signature and the highest-four-digit hexadecimal digits  1  of data “10” other than the digital signature, and the consumable chip extracts a value from these two places and sends the value to the printing device. 
     Step  202 : Receive an access request of a printing device for the indicator. 
     Step  203 : Select at least a part of data in the target data according to the access request. 
     Step  204 : Send the at least a part of data to the printing device to respond to the access request of the printing device for the indicator. 
     In this embodiment, an implementation of step  202  to step  204  is the same as an implementation of step  102  to step  104  in Embodiment 1 of this application, and details are not described herein again. 
     Step  205 : Receive an access request of the printing device for the target data. 
     If the target data stored in the consumable chip is a digital signature, after obtaining, from the consumable chip, an indicator used to indicate that the consumable chip stores a digital signature, the printing device sends an access request for the digital signature to the consumable chip. 
     Similarly, if the target data stored in the consumable chip is unsigned data, after obtaining an indicator used to indicate that no digital signature is stored in the consumable chip, the printing device learns that there is no digital signature data stored in the consumable chip, the printing device no longer verifies a data signature, but can still obtain the unsigned data from the consumable chip, and the printing device sends an access request for the unsigned data to the consumable chip. 
     Step  206 : Send the target data to the printing device to respond to the access request of the printing device for the target data. 
     In this embodiment, if the consumable chip obtains the digital signature from a memory of the consumable chip after receiving the access request for the digital signature, and sends the digital signature to the printing device, after receiving data signature data, the printing device verifies the data signature, and after the verification is passed, it indicates that the consumable chip is authentic and trustworthy. 
     Similarly, if the consumable chip obtains unsigned data from the memory of the consumable chip after receiving the access request for the unsigned data, and sends the unsigned data to the printing device, the printing device may receive the unsigned data, and perform further processing by using the unsigned data. 
     In the responding method for a consumable chip provided in this embodiment, at least a part of data in a digital signature or unsigned data indicates an indicator of a type of target data in a consumable chip. In this way, a storage part does not need to be separately disposed to store the indicator, thereby improving security of the consumable chip. In addition, the indicator has diversified storage manners, which makes it more difficult for a third party to learn of a digital signature status of the consumable chip, thereby further improving security of the consumable chip. 
       FIG.  7    is a schematic structural diagram of a consumable chip according to an embodiment of this application. As shown in  FIG.  7   , the consumable chip  70  provided in this embodiment includes a storage module  71 . 
     The storage module  71  is configured to store target data and an indicator used to indicate a type of the target data in the consumable chip, where at least a part of data in the target data is used as the indicator; and the target data is a digital signature or unsigned data. 
     The consumable chip  70  may further include a receiving module  72 , a selection module  73 , and a sending module  74 , where the receiving module  72  is configured to receive an access request of a printing device, for example, an access request for the indicator. The selection module  73  is configured to select at least a part of data in the target data according to the access request. The sending module  74  is configured to send the at least a part of data to the printing device in response to the access request of the printing device. 
     The consumable chip provided in this embodiment may perform the technical solution of the method embodiment shown in  FIG.  1   . Implementation principles and technical effects thereof are similar, and are not described herein again. 
     Optionally, the entire indicator used to indicate the type of the target data in the consumable chip is included in the target data. 
     In an optional implementation, the indicator used to indicate the type of the target data in the consumable chip is data at a fixed address in the target data. 
     Alternatively, in another implementation, the indicator used to indicate the type of the target data in the consumable chip is data at multiple different addresses in the target data or common information of data at multiple different addresses. 
     Alternatively, in still another optional implementation, the indicator used to indicate the type of the target data in the consumable chip is data selected from any address whose value is a preset value in the target data. 
     Optionally, at least a part of data in the target data and data outside the target data are jointly used as the indicator. 
     Optionally, in this embodiment, the receiving module  72  is further configured to receive an access request of the printing device for the target data. The sending module  74  is further configured to send the target data to the printing device to respond to the access request of the printing device for the target data. 
     The consumable chip provided in this embodiment may further perform the technical solution of the method embodiment shown in  FIG.  4   . Implementation principles and technical effects thereof are similar, and are not described herein again. 
       FIG.  8    is a schematic structural diagram of another consumable chip according to an embodiment of this application. As shown in  FIG.  8   , the consumable chip  80  in this embodiment of this application includes a memory  81 , a processor  82 , and a computer program. 
     The computer program is stored in the memory  81 , and is configured to be executed by the processor  82  to implement the responding method for a consumable chip provided in this embodiment of this application. 
     Related description can be understood with reference to the related illustration and effects corresponding to the steps in  FIG.  1    and  FIG.  4   , and is not made here again. 
     In this embodiment, the memory  81  and the processor  82  are connected by using a bus. 
     The memory may be, but is not limited to, a random access memory (Random Access Memory, RAM), a read only memory (Read Only Memory, ROM), a programmable read-only memory (Programmable Read-Only Memory, PROM), an erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), an electric erasable programmable read-only memory (Electric Erasable Programmable Read-Only Memory, EEPROM), a flash memory (Flash Memory), or the like. The memory is further configured to store a program, and after receiving an execution instruction, the processor executes the program. 
     The processor may be an integrated circuit chip and has a signal processing capability. The foregoing processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), and the like. The processor may be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a discrete-gate or transistor logic device, or a discrete hardware component. The processor may implement or perform the methods, the steps, and logical block diagrams that are disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the like. 
     A person skilled in the art should understand that the consumable chip in this application includes a memory and a processor, the memory is configured to store program instruction code, and the processor is configured to execute the program instruction code, so as to implement the data processing method applied to the consumable chip in the foregoing embodiment. An embodiment of this application may be provided as a method, an apparatus, or a computer program product. Therefore, the embodiments of this application may use a form of hardware only embodiments, software only embodiments, or embodiments with a combination of software and hardware. Moreover, the embodiments of this application may use a form of a computer program product that is implemented on one or more computer-usable storage media (including but not limited to a disk memory, a CD-ROM, an optical memory, and the like) that include computer-usable program code. 
     An embodiment of this application further provides a consumable cartridge, where the consumable cartridge includes a consumable chip, and the consumable chip is detachably mounted on the consumable cartridge. 
     The consumable chip is the consumable chip shown in  FIG.  7    or  FIG.  8   . For related description, refer to the description of the consumable chip shown in  FIG.  7    or  FIG.  8   . Details are not described herein again. 
     In this embodiment, the consumable cartridge may be an ink cartridge, a powder cartridge, or a toner cartridge. Ink may be accommodated in the ink cartridge, and carbon powder may be accommodated in the powder cartridge or the toner cartridge. 
     An embodiment of this application further provides a computer readable storage medium, where a computer program is stored thereon, and the computer program is executed by a processor to implement the responding method for a consumable chip provided in any embodiment of this application. 
     An embodiment of this application further provides a chip for running an instruction, where the chip includes a memory and a processor, the memory stores code and data, the memory is coupled to the processor, and the processor runs the code in the memory, so that the chip is configured to perform any responding method for a consumable chip in the foregoing embodiments. 
     An embodiment of this application further provides a program product including an instruction. The program product includes a computer program. The computer program is stored in a computer readable storage medium. At least one processor may read the computer program from the computer readable storage medium. When executing the computer program, the at least one processor may implement any responding method for a consumable chip in the foregoing embodiments. 
     An embodiment of this application further provides a computer program, and when the computer program is executed by a processor, the computer program is configured to perform any responding method for a consumable chip in the foregoing embodiments. 
     The embodiments of this application are described with reference to the flowcharts and/or block diagrams of the method, the device (system), and the computer program product according to the embodiments of this application. It should be understood that computer program instructions may be used to implement each process and/or each block in the flowcharts and/or the block diagrams and a combination of a process and/or a block in the flowcharts and/or the block diagrams. These computer program instructions may be provided for a general-purpose computer, a dedicated computer, an embedded processor, or a processor of any other programmable data processing device to generate a machine, so that the instructions executed by a computer or a processor of any other programmable data processing device generate an apparatus for implementing a specific function in one or more processes in the flowcharts and/or in one or more blocks in the block diagrams. 
     The foregoing descriptions are merely preferable embodiments of this application, and are not intended to limit this application. For a person skilled in the art, this application may have various modifications and variations. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of this application shall fall within the protection scope of this application.