WO2015109939A1

WO2015109939A1 - Imaging device, secure imaging method thereof and imaging system

Info

Publication number: WO2015109939A1
Application number: PCT/CN2015/070127
Authority: WO
Inventors: 尹爱国; 彭继兵; 余成柱
Original assignee: 珠海赛纳打印科技股份有限公司
Priority date: 2014-01-27
Filing date: 2015-01-05
Publication date: 2015-07-30
Also published as: CN103777912A; CN103777912B

Abstract

An imaging device, a secure imaging method thereof and an imaging system. The method comprises: generating a password based on an event triggered by a user and presenting the password to the user; receiving a first random number and an encrypted to-be-printed file sent by a computing device connected to the imaging device; based on the password and the first random number, using a first specified algorithm to generate a key; using the key to decrypt the encrypted to-be-printed file based on a second specified algorithm to obtain a decrypted to-be-printed file; and printing out the decrypted to-be-printed file. Not only does a printed file become more secure in a transmission process but also a manufacturing cost of an imaging apparatus is reduced to an extent.

Description

Imaging device and safety imaging method thereof, imaging system

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. CN201410041089.6, filed on Jan. 27,,,,,,,,,,,,,,, In this article.

Technical field

The present invention relates to the field of imaging, and in particular to an imaging device, a security imaging method thereof, and an imaging system.

Background technique

In recent years, the advent of network printers has enabled more computers to share prints and optimize office needs. However, when the print data is transmitted between the computer and the printer through the network in plain text, the listener can easily obtain the printed content by intercepting the network data packet. In this way, it is likely to cause trade secrets or personal information to be leaked.

In order to solve this problem, there is a secure printing system consisting of a printer and a computer equipped with a print driver, which can encrypt the data of the document to be printed and then transfer it to the printer for printing. The specific security imaging method flow is shown in FIG. 1. The print driver on the computer generates a random number c after the user selects the document to be printed, and generates the key D by using the algorithm M. Next, the print driver encrypts the document data to be printed by using the key D in conjunction with the algorithm N, and then issues the encrypted document data to be printed and the random number c to the printer. The printer generates a key D based on the received random number c in combination with the algorithm M, and then uses the algorithm D to decrypt the printed document data by using the algorithm M to complete the printing operation. In the above secure printing system, although the print data is encrypted and then transmitted, since the information for generating the key is generated by the computer and transmitted to the printer via the network, the listener intercepts the random number and the encrypted print data. It is still possible to decrypt the print data and obtain the print content by trying to use a variety of algorithms.

In order to further improve the confidentiality of the print data, the following security imaging methods are available in the prior art, and the specific process is shown in FIG. 2. After the user selects the document to be printed, the print driver on the computer notifies the user to enter the print password. When the user enters the print password e, the print driver on the computer is based on the print password. The code uses the algorithm P to calculate the key F, and based on the key F, the algorithm Q is used to encrypt the document data to be printed, and then sent to the printer. After receiving the document data to be printed, the printer reminds the user to input the print password through the display screen. After the user inputs the print password e, the printer uses the algorithm P to calculate the key F by using the print password e input by the user, and then uses the algorithm Q to decrypt the print data based on the key F, and completes the printing of the decrypted print data. Because the key-related data in this security imaging method is not transmitted through the line, the listener cannot intercept, the encryption is secure, but the printer is required to have a display screen and a large number of buttons for reminding notifications and printing password input, which increases the printer's Volume and cost.

Summary of the invention

One of the technical problems to be solved by the present invention is to provide an imaging device, a security imaging method, and an imaging system that can make the printing file more secure in the transmission process and can save the manufacturing cost of the imaging device to a certain extent.

In order to solve the above technical problems, the present invention provides a security imaging method of an imaging apparatus. The method includes generating a password according to a user triggering event and presenting the password to a user, receiving a first random number sent from a computing device connected to the imaging device, and receiving from a computing device connected to the imaging device Encrypted file to be printed; generating a key based on the password and the first random number using a first setting algorithm; using the key to encrypt the to-be-printed based on a second setting algorithm The file is decrypted to obtain a decrypted file to be printed; and the decrypted file to be printed is printed out.

Moreover, the user triggering event can further include the user inputting a trigger indication from the imaging device or the user transmitting a trigger indication to the imaging device via a computing device coupled to the imaging device.

In addition, the step of generating a password according to the user triggering event may further comprise: generating the password according to at least one of the following information: an attribute of a user operating as a user triggering event to the imaging device; and when the user triggering event occurs The state of the imaging device; the environmental property of the imaging device when the user trigger event occurs.

In addition, the attribute of the user operating the button of the imaging device may further include a time interval of two buttons, a button duration, and/or a button moment.

Further, the method may further include: upon receiving a password generation lock signal input from the imaging device or a computing device connected to the imaging device, the imaging device is set to a password lock state; upon receiving from the The image forming device is set to a password unlock state when a password input by the imaging device or the computing device connected to the imaging device generates an unlock signal.

Further, the method may further include: determining the imaging device when a user trigger event occurs Whether the device is in the password lock state; only when the judgment result is no, the password is generated according to the user trigger event and the password is presented to the user.

Moreover, the step of presenting the password to a user can further include printing the password or displaying the password on a display of the imaging device.

In addition, the step of generating a password according to the user triggering event may further include: generating the second random number according to the user triggering event, using the second random number as a password, or performing the second random number one or more times The operation to generate the password.

According to still another aspect of the present invention, an image forming apparatus is also provided. The device includes: a first password generating unit, generating a password according to a user triggering event and presenting the password to a user; the first interface unit receiving the first random number sent from the computing device connected to the imaging device and performing An encrypted file to be printed; a print data decryption unit that generates a key based on the password and the first random number using a first setting algorithm, and encrypts the key based on a second setting algorithm using the key The file to be printed is decrypted to obtain a decrypted file to be printed; and the image forming unit prints out the decrypted file to be printed.

Further, the password generation unit may be further configured to generate a password according to a user input as a user trigger event inputting a trigger indication from the imaging device or a user transmitting a trigger indication to the imaging device through a computing device connected to the imaging device.

In addition, the password generating unit may be further configured to generate the password according to at least one of the following information: an attribute of a user operating as a user triggering event to the imaging device; and a state of the imaging device when a user triggering event occurs; The environment attribute of the imaging device when the user triggers an event, wherein the attribute of the user operating the button of the imaging device further includes a time interval of each button, a button duration, and/or a button moment.

Furthermore, the password generating unit may be further configured to set the image forming device to a password lock state upon receiving a password generation lock signal input from the image forming device or received from a computing device connected to the image forming device The imaging device is set to a password unlock state upon receiving a password input from the imaging device or received from a computing device connected to the imaging device; and, when a user triggering event occurs, Determining whether the imaging device is in the password lock state, and generating a password according to the user trigger event and presenting the password to the user only when the determination result is negative.

Additionally, the device can also include a password generation button, wherein the user trigger event occurs when the user presses the password generation button.

Furthermore, the password generating unit may further include a random number generator implemented as hardware or software, the random number generator generating a second random number according to the user trigger event, and The second random number is used as a password, or one or more operations are performed on the second random number to generate the password.

Furthermore, the print data decryption unit may be further configured to: when the image forming device saves the previously generated key, use the saved key to encrypt the to-be-printed based on the second setting algorithm The file is decrypted to obtain the decrypted file to be printed.

According to yet another aspect of the present invention, an imaging system is also provided. The system includes an imaging device of the foregoing technical solution and a computing device connected to the imaging device, wherein the computing device includes a second password generating unit, a print data encryption unit, and a second interface unit: the second password generating unit Generating the first random number, generating a key by using the first setting algorithm based on the first random number and a password input by the user input by the password generating unit of the imaging device; The print data encryption unit is configured to encrypt the file to be printed based on the encryption algorithm corresponding to the second setting algorithm by using the key; the second interface unit is configured to encrypt the first random number and The file to be printed is transferred to the imaging device.

Furthermore, the second password generating unit may be further configured to use the first setting algorithm based on the first random number and a password input by the user input by the password generating unit of the imaging device. When the key is generated: if the computing device holds a password generated by the password generating unit of the imaging device previously input by the user, based on the first random number and previously input by the user by the imaging device The password generated by the password generating unit generates a key by using the first setting algorithm.

Compared with the prior art, one or more embodiments of the present invention may have the following advantages: in the present invention, since a password is generated on the printer 10 side and the password is not transmitted in the network, it is difficult for an illegal user to intercept the network or crack the computing device. The password generation algorithm acquires the password, so that the security of the print file is greatly increased without setting a complicated keyboard for inputting a password on the printer side.

Other advantages, objects, and features of the invention will be set forth in part in the description which follows, and in the <RTIgt; The teachings of the present invention are taught. The objectives and other advantages of the invention may be realized and obtained in the <RTIgt;

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawing:

1 is a flow chart of a safety imaging method in the prior art;

2 is a flow chart of another safety imaging method in the prior art;

3 is a block diagram showing the structure of an imaging system according to an embodiment of the present invention;

4 is a flow chart of a secure imaging method in accordance with an embodiment of the present invention.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, in which the present invention can be applied to the technical problems, and the implementation of the technical effects can be fully understood and implemented. It should be noted that the various embodiments of the present invention and the various features of the various embodiments may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

Additionally, the steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions, and although the logical order is illustrated in the flowchart, in some cases may be different The steps shown or described are performed in the order herein.

In order to solve the above problem of security printing, the present invention provides a security printing system, including a computing device and an imaging device, wherein a driving device of the imaging device is mounted on the computing device, and the user can select a document or a picture to be printed through the computing device and send it to the The imaging device prints out. The above computing devices refer to mobile phones, PDAs (Personal Digital Assistants, personal digital), computers, tablets, notebooks and the like. The image forming apparatus of the present invention refers to a printer, a scanner, a copying machine, a facsimile machine, or a MFP which integrates printing, copying, scanning, and facsimile. For convenience of explanation, the following will be described in detail by taking a computer as an example of a computing device and a printer as an example of an image forming apparatus.

3 is a block diagram of a security imaging system. The printer 10 includes a control unit 101, a password generation unit 102 (corresponding to a first password generation unit), a print data decryption unit 103, a detection unit 104, an input unit 105, an interface unit 106 (corresponding to a first interface unit), and an imaging unit 107. . The control unit 101 is used to control the operation of each unit module in the printer. The password generation unit 102 is configured to generate a password according to a user trigger event and present the password to the user. The interface unit 106 is configured to communicate with the computing device 20 to receive print information transmitted by the computing device 20. The print data decryption unit 103 is configured to generate a key using the first setting algorithm based on the password generated by the password generation unit 102 and the first random number received from the computing device 20 through the interface unit 106, and based on the generated key. The second setting algorithm decrypts the encrypted file to be printed received from the computing device 20 through the interface unit 106, and obtains the decrypted file to be printed. The control unit 101, the print data decryption unit 103, and the password generation unit 102 can combine the corresponding soft memory storage by a shared processor. The implementation of the methods can also be implemented by using separate chips.

The imaging unit 107 is configured to print out the decrypted file to be printed to complete an imaging job.

Preferably, the user inputs a trigger indication from the input unit 105 of the printer 10. The password generation unit 102 uses the trigger indication input by the user as a user trigger event, and generates a password according to the trigger indication. In this case, more preferentially, the detecting unit 104 detects, as a user triggering event, for example, an attribute of a user's operation on the imaging device key, a state of the imaging device when a user triggering event occurs, and a user triggering event when the user triggers an event One or more of the environmental properties and the like in which the imaging device is located. The attributes of the button operation of the imaging device may include a time interval of each button (eg, a time interval in which the start button is pressed twice), a button duration, and/or a button moment, and the like. The state of the image forming apparatus may include a power-on/power-down condition of the image forming apparatus, a number of jobs performed by the image forming apparatus, and the like. The environmental attributes of the imaging device may include environmental factors such as temperature values, humidity values, etc. within or outside the chassis. The detecting unit 104 transmits the detection result to the password generating unit 102. The password generation unit 102 generates a password based on the user trigger event and the detection result of the detecting unit 104. Different printing passwords are generated for different detection results of the triggering event. For example, when the time between two clicks is 3 seconds, 24325156 is generated as the printing password; when the duration between the two clicks is 5 seconds, the generation is generated. 43216789 as the print password. In short, after receiving the user trigger event, the password generating unit 102 generates a password based on the detection result of the detecting unit 104. The password generating unit 102 may be a hardware module or a software program.

Preferably, the password generation unit 102 includes a random number generator. The random number generator generates a second random number based on the user trigger event. The password generating unit 102 may directly use the second random number as a password, or may perform one or more operations on the second random number generated by the random number generator to generate the password. More specifically, the password may be obtained by being repeatedly encrypted by the printer. For example, the password generating unit 102 generates a second random number, and then performs a plurality of arithmetic operations, so that the random number of digits is longer, the content is more random, and the content is more difficult to be Decryption by others. The above algorithm is preferably a symmetric algorithm, and the encryption is simple, such as SM2, SM3, SM4, etc., which are in accordance with the strict rules of the state.

Additionally, the aforementioned user triggering event may also be a triggering indication sent by a computing device connected to the printer 10. The connection between the printer 10 and the computing device may be wired or wireless. The wired connection may be USB, network cable, serial cable, parallel cable, etc., and the wireless may be wifi, Bluetooth, infrared, or the like. Moreover, the computing device can also be any computing device, that is, not limited to computing device 20 that is to send a print job to printer 10.

The input unit 105 is an instruction input interface of the user and can be a button. For example, the input unit 105 can include a password generation button that occurs when the user presses the password generation button.

The computing device 20 includes a control unit 201 and a password generating unit 202 (corresponding to the second password generation Unit), print data encryption unit 203, display and input unit 204, interface unit 205 (corresponding to the second interface unit). The control unit 201 is used to control the operation of each unit module in the computing device. The password generating unit 202 is configured to generate a first random number, and generate a key using the first setting algorithm based on the first random number and a password generated by the printer 10 input by the user. The print data encryption unit 203 is configured to encrypt the file to be printed based on the encryption algorithm corresponding to the second setting algorithm by using the key generated by the password generation unit 202. The display and input unit 204 is configured to display information to the user and provide an instruction input interface, which may be a touch screen, a display screen, a keyboard, a mouse, a tablet, or the like. The interface unit 205 is configured to communicate with the printer, and send the first random number and the encrypted print information such as the file to be printed. The above-described password generating unit 202 and print data encrypting unit 203 may be embedded in a print driver or may be separately installed in a software program on the computing device 20. At this time, the processor of the computer device 20 constitutes the password generating unit 202 and the print data encrypting unit 203 together with a corresponding software program embedded in the print driver or installed in the hard disk of the computing device. The control unit 201, the password generation unit 202, and the print data encryption unit 203 can share the same processor.

Moreover, to further improve user friendliness, reducing the number of times a user enters a password, computing device 20 may save the password entered by the user for use in the next print job. In this case, the password generation unit 202 generates a key using the first setting algorithm based on the first random number and the password generated by the password generating unit of the imaging device input by the user. The computing device 20 saves the password previously input by the user, and then no longer prompts the user to input the password. Instead, the first setting algorithm is used to generate the key based on the first random number generated by the user and the password previously input by the user.

In order to reduce the user's erroneous operation, so that the password is erroneously changed by pressing the button on the printer side, the user can transmit a password generation lock signal to the printer 10 by using a print driver or the like, or directly input the password generation lock through the input unit 105 of the printer 10. signal. The password generation unit 102 of the printer 10 sets the printer 10 to a password lock state upon receiving a password generation lock signal input from the printer 10 or received from the computing device 20 connected to the imaging device to prohibit the printer 10 from being disabled. The password generation unit 102 generates a new password based on the user trigger event. In this case, when a user triggering event occurs, the password generating unit 102 of the printer 10 first determines whether it is in the password locked state, and generates a password according to the user triggering event and presents it to the user only when the determination result is negative. password. When a new print password needs to be generated, the user may first send an unlock signal to the printer 10 via the print driver or the input unit 105 of the printer 10, upon receiving the input from the printer 10 or from the computing device 20 connected to the printer 10. When the password generates an unlock signal, the printer 10 is set to the password unlock state.

Although the imaging method has been described above in connection with the modular structure of the imaging system, the security imaging method will be further explained in further detail in more detail with reference to the flowchart of FIG. All of the foregoing descriptions can be incorporated in the following methods.

The processing flow of the printer 10 and the computing device 20 is shown on the left and right sides of FIG. 4, respectively. Each step will be described in detail below.

In step S110, the password generation unit 102 of the printer 10 generates a password a according to the user trigger event and presents the password a to the user. When the user wants to perform a print job, a trigger indication is sent to the printer 20 by the computing device 20 as a user trigger event or a trigger indication is input through the input unit 105 of the printer 20 as a user trigger event. The processing in this step is described in detail in the above description regarding the password generating unit 102 and the detecting unit 104, and the like, and will not be described again. Then it proceeds to step S120.

In step S120, the printer 10 prints out the password a or displays the password a on its display. In this way, the user can see the password a.

On the other hand, when the user wants to print a document, the user selects a file to be printed (for example, a document or a picture, etc.) on the side of the computing device 20, thereby triggering the process proceeds to step S210.

In step S210, the computing device 20 determines the file to be printed selected by the user as a file to be printed. Then it proceeds to step S220.

In step S220, the computing device 20 generates a random number b. There are many ways to generate random numbers, but this is not an example. Then, the process proceeds to step S230.

In step S230, the computing device 20 prompts the user to input the password a generated by the printer 10 in step S120 (i.e., the password displayed by the printer to the user by printout or the password presented to the user using its display). Then, the process proceeds to step S240.

Preferably, step 230 may be performed when computing device 20 first uses the printer for printing. In other words, the password is not required to be entered each time the user prints, and the password can be pre-stored in the computing device 20. Thus, the print password entered by the user when using the computer for the first time on the computer side is stored in the computer until a new print password is entered, overwriting the original print password. The new print password is generated by the user pressing the button of the printer. The above description has been made in the description of the password generating unit 202 of the computing device 20, and details are not described herein again.

Further, the computing device 20 may even allow the user to enter the password a through the user interface at any time after installing the printer driver or after installing the printer driver, and save the password a entered by the user. This user interface can be implemented as part of the driver or as a separate program.

Further, the computing device 20 may also save the generated key after the password generation unit 202 generates the key. Thus, the password generation unit 202 can determine whether the computing device 20 holds the previously generated key before generating the key. If the computing device saves the previously generated key, the saved key is directly acquired without generating the key based on the first random number b and the password a again. And when the printer generates a new password based on the user trigger event, then the password generation list of the computing device 20 The element 202 can prompt the user to input a new password according to the notification of the printer or the active operation of the user, acquire a new password input by the user and generate a new random number, and then generate a new one based on the new password and the new random number thereof. Key and store the new key. In fact, the user can perform an operation of inputting a password at any time through a button or the like set on the software interface to trigger the password generation unit 202 of the computing device 20 to generate and store a new random number and a new key. Each time the password generation unit 202 generates a new random number, the new random number is transmitted to the imaging device 10.

The specific step of causing the password generating unit 202 of the computing device to regenerate the random number may send a signal to the computing device to notify the computing device to regenerate the random number, or the user clears the computing device by selecting a reset button on the operation interface of the print driver on the computing device. The stored key, or the user resets the random number by the computing device by selecting a reset button on the operator interface of the print driver on the computing device.

It should be emphasized that the password a of the present invention is generated by the printer 10, not generated by the computing device side, and is not transmitted between the computing device and the printer through the network, thus simplifying the setting of the printer (the printer is not required to have Rich input of numbers or letters, etc.) increases security.

In step S240, the computer 20 generates the key K using the algorithm S based on the password a and the first random number b. Then it proceeds to step S250.

In step S250, the computer 20 encrypts the print file by using the key K and the algorithm H to obtain the encrypted file to be printed. Then it proceeds to step S260.

In step S260, the computer 20 transmits the encrypted print file and the print information such as the first random number b to the printer 10. Step S260 will trigger the printer to perform step S130.

Step S130, the printer 10 receives the first random number b;

In step S135, the printer 10 receives the print information such as the file to be printed which has been encrypted. In addition, the print information may also include plain text print instructions and the like.

In step S140, the printer 10 generates a key K using the algorithm S based on the password a and the first random number b, wherein the password a is the password a generated by the printer 10 in step S110. Since the password, random number, and algorithm used by the printer side and the computing device side are identical, a key that is consistent with the computing device side will be generated. Since the password is generated on the printer 10 side and the password is not transmitted by the network, it is difficult for the illegal user to intercept the network or crack the password generation algorithm of the computing device to acquire the password, thereby greatly increasing the security of the printed file. Then it proceeds to step S150.

In step S150, the printer 10 decrypts the encrypted file to be printed based on the decryption algorithm corresponding to the algorithm H using the key K. Then it proceeds to step S160.

In step S160, the printer 10 prints out the decrypted file to be printed.

Incidentally, the above steps S130 and S135 can be combined into the same step. That is, the computing device 20 can transmit the first random number b as part of the print information to the printer 10 along with the encrypted file to be printed, and the printer 10 receives the first random number b sent by the computing device 20 And the encrypted file to be printed.

Moreover, computing device 20 can communicate the first random number b to printer 10 at any time prior to executing the print job. That is, the above step S130 may be performed at any time before step S140, for example, may be performed before step S110. Upon receiving the encrypted file to be printed, the printer 10 may perform decryption based on the first random number b received from the computing device 20 before step S130 and the password a generated by the printer 10 in step S110.

Further, step S140 may also be performed before step S135. After performing step S140, the printer 10 can save the key in S140. In this case, the printer 10 does not need to perform steps S130 and S140 each time the print information is received, but after performing step S135, directly proceeds to step S150 to utilize the previously generated key based on the saved algorithm. The decryption algorithm decrypts the encrypted file to be printed. In other words, when the imaging device 10 holds the previously generated key, the print data decryption unit 103 decrypts the encrypted file to be printed based on the second setting algorithm using the saved key. The decrypted file to be printed is obtained.

In addition, regarding the storage of the password a, the password generated by the previous generation may be used to overwrite the previously generated password, or sequentially stored in the corresponding memory, and the password stored after each use is used, and when the memory is full, all are erased.

While the embodiments of the present invention have been described above, the described embodiments are merely illustrative of the embodiments of the invention, and are not intended to limit the invention. Any modification and variation of the form and details of the invention may be made by those skilled in the art without departing from the spirit and scope of the invention. It is still subject to the scope defined by the appended claims.

Claims

A security imaging method for an imaging device, comprising:

Generating a password according to a user trigger event and presenting the password to the user;

Receiving a first random number sent from a computing device connected to the imaging device;

Receiving an encrypted file to be printed sent from a computing device connected to the imaging device;

Generating a key using the first setting algorithm based on the password and the first random number;

Decrypting the encrypted file to be printed based on the second setting algorithm by using the key to obtain a decrypted file to be printed;

The decrypted file to be printed is printed out.
The method of claim 1 wherein the user triggering event further comprises a user inputting a trigger indication from the imaging device or a user transmitting a trigger indication to the imaging device via a computing device coupled to the imaging device.
The method of claim 2, wherein the step of generating a password based on the user triggering event further comprises generating the password according to at least one of the following information:

An attribute of a user operating as a user triggering event to the imaging device;

The state of the imaging device when the user trigger event occurs;

The environmental attributes of the imaging device when the user trigger event occurs.
The method according to claim 3, wherein the attribute of the user operating the button of the imaging device further comprises a time interval of two key presses, a button duration and/or a button moment.
The method according to any one of claims 1 to 4, further comprising:

The imaging device is set to a password lock state upon receiving a password generation lock signal input from the imaging device or a computing device connected to the imaging device;

The imaging device is set to a password unlock state upon receiving a password generated unlock signal input from the imaging device or a computing device connected to the imaging device.
The method of claim 5, further comprising:

Determining whether the imaging device is in the password lock state when a user trigger event occurs;

The password is generated based on the user trigger event and presented to the user only if the determination is negative.
The method according to any one of claims 1 to 4, wherein the step of presenting the password to a user further comprises printing out the password or displaying the password on a display of the imaging device.
The method according to any one of claims 1 to 4, wherein the step of generating a password according to a user triggering event further comprises: based on generating a second random number according to the user triggering event, the second random number As the password, the second random number is subjected to one or more operations to generate the password.
An imaging device, comprising:

a first password generating unit, generating a password according to the user triggering event and presenting the password to the user;

a first interface unit, receiving a first random number sent from a computing device connected to the imaging device and the encrypted file to be printed;

a print data decryption unit, configured to generate a key by using a first setting algorithm based on the password and the first random number, and decrypting the encrypted file to be printed based on a second setting algorithm by using the key, Obtaining the decrypted file to be printed;

An image forming unit that prints out the decrypted file to be printed.
The image forming apparatus according to claim 9, wherein the password generating unit is further configured to input a trigger indication from the imaging device according to a user as a user trigger event or the user inputs to a computing device connected to the imaging device The imaging device sends a trigger indication to generate a password.
The image forming apparatus according to claim 10, wherein the password generating unit is further configured to generate the password according to at least one of the following information:

An attribute of a user operating as a user triggering event to the imaging device;

The state of the imaging device when a user trigger event occurs;

The environment attribute of the imaging device when a user trigger event occurs, wherein

The attribute of the user operating the button of the imaging device further includes a time interval of each button, a button duration, and/or a button moment.
The image forming apparatus according to claim 9, wherein said password generating unit is further configured to:

The imaging device is set to a password lock state upon receiving a password generation lock signal input from the imaging device or received from a computing device connected to the imaging device;

Upon receiving an unlock signal generated from a password input by the imaging device or received from a computing device connected to the imaging device, the imaging device is set to a password unlock state;

When the user triggering event occurs, it is determined whether the imaging device is in the password lock state, and only when the determination result is no, the password is generated according to the user trigger event and the password is presented to the user.
The image forming apparatus according to any one of claims 9 to 12, further comprising a password generation button, wherein

The user trigger event occurs when the user presses the password generation button.
The image forming apparatus according to any one of claims 9 to 12, wherein

The password generating unit further includes a random number generator implemented as hardware or software, the random number generator generating a second random number according to the user trigger event, and using the second random number as a password or a pair The second random number is subjected to one or more operations to generate the password.
The image forming apparatus according to any one of claims 9 to 12, wherein the print data decrypting unit is further configured to utilize the saved key when the image forming apparatus holds the previously generated key Decrypting the encrypted file to be printed based on the second setting algorithm to obtain a decrypted file to be printed.
An imaging system comprising the imaging device of claims 9-15 and a computing device coupled to the imaging device, wherein the computing device comprises a second password generating unit, a print data encryption unit, and a second interface unit:

The second password generating unit is configured to generate the first random number, based on the first random number And generating, by the user, a password generated by the password generating unit of the imaging device, using the first setting algorithm to generate a key;

The print data encryption unit is configured to encrypt a file to be printed based on an encryption algorithm corresponding to the second setting algorithm by using the key;

The second interface unit is configured to transmit the first random number and the encrypted file to be printed to the imaging device.
The system according to claim 16, wherein said second password generating unit is further configured to: utilize a password generated by said password generating unit of said image forming apparatus based on said first random number and a user input When the first setting algorithm generates a key:

If the computing device stores a password generated by the password generating unit of the imaging device previously input by the user, based on the first random number and the password generating unit previously input by the user by the imaging device The generated password is generated using the first setting algorithm.