CN113496451A - Watermark adding method and device and screen image leakage tracking method and device - Google Patents

Abstract

The embodiment of the invention discloses a watermark adding method and a watermark adding device as well as a screen image leakage tracking method and a screen image leakage tracking device, wherein the watermark adding method comprises the following steps: determining equipment information and a character dot matrix graph corresponding to each character of the equipment information, and determining a check dot matrix graph corresponding to the equipment information based on the character of the equipment information; and generating a watermark pattern corresponding to the equipment information based on the character dot matrix pattern corresponding to each character and the check dot matrix pattern, and adding the watermark pattern corresponding to the equipment information to secret information. The method provided by the invention can reduce the misjudgment rate and improve the accuracy of the determined equipment information leaking the confidential information.

Description

A method and device for adding a watermark, and a method and device for tracking screen image leakage

technical field

The invention relates to the technical field of information security, in particular to a method and device for adding a watermark, and a method and device for tracking screen image leakage.

Background technique

With the continuous development of paperless office technology, it is inevitable that confidential information will be leaked through screenshots, photos, etc. In order to prevent the leakage of confidential information in the enterprise from being undocumented, it is particularly important to track screen images containing confidential information.

At this stage, companies usually track screen images containing confidential information through digital watermarking technology. Specifically, software capable of realizing the function of digital watermarking technology can be installed on each device (such as a computer, pc and other terminal devices), and management software for managing the aforementioned software can be installed on the management device. When a user browses/screenshots confidential information through a certain device, the device can use the aforementioned software to represent the device information of the device in the form of a nine-square lattice, generate a watermark graphic, and fuse the watermark graphic with the confidential information and present it to users. When the management device obtains a screen image containing confidential information, the management device can extract the watermark graphic in the screen image through the aforementioned management software, determine the device information for generating the screen image through a preset dot-matrix graphic comparison table, and can use the The device information is determined to be the device information that leaks confidential information.

In the prior art, when the watermark image is tampered with, there may be certain device information leaking confidential information, which is not the real device information leaking confidential information, thereby causing misjudgment, which will lead to a higher misjudgment rate to a certain extent. high.

SUMMARY OF THE INVENTION

Due to the above problems in the existing methods, the embodiments of the present invention provide a method and device for adding a watermark, and a method and device for tracking screen image leakage.

In a first aspect, an embodiment of the present invention provides a method for adding a watermark, including:

determining the device information and the character lattice pattern corresponding to each character of the device information, and determining the check lattice pattern corresponding to the device information based on the characters of the device information;

Based on the character lattice pattern corresponding to each character and the check lattice pattern, a watermark pattern corresponding to the device information is generated, and the watermark pattern corresponding to the device information is added to the confidential information.

Optionally, the determining the device information and the character lattice graphics corresponding to each character of the device information, including:

Based on the preset lattice pattern comparison table, determine the character lattice pattern corresponding to each character;

The character based on the device information to determine the checkpoint pattern corresponding to the device information, including:

Determine the verification information corresponding to the device information based on the characters of the device information and preset verification parameters;

The lattice pattern corresponding to the verification information is determined based on the preset lattice pattern comparison table, and the lattice pattern corresponding to the verification information is determined as the verification lattice pattern corresponding to the device information.

Optionally, generating a watermark pattern corresponding to the device information based on the character lattice pattern corresponding to each character and the check lattice pattern, including:

Determining a starting dot matrix, arranging the starting dot matrix, the character dot matrix graphics corresponding to each character, and the check dot matrix graphics according to a preset watermark format, to generate a watermark graphic corresponding to the device information.

In a second aspect, an embodiment of the present invention further provides a method for tracking screen image leakage, including:

Extract the watermark graphic in the acquired screen image, wherein the watermark graphic is acquired by using the watermark adding method according to any one of the first aspects;

The first check information is determined based on a check dot pattern in the watermark pattern, wherein the check dot pattern is generated based on a character dot pattern, and the character dot pattern is related to a device that generates the screen image. information correspondence;

Determine the second check information based on all the character lattice graphics in the watermark graphics, and determine the device information corresponding to the watermark graphics;

When the first verification information is the same as the second verification information, the device information corresponding to the watermark image is determined as the device information that leaks the confidential information.

Optionally, the determining the first check information based on the check dot matrix pattern in the watermark pattern includes:

determining a starting dot matrix in the screen image, and determining a preset number of character dot matrix graphics and check dot matrix graphics based on the starting dot matrix and a preset watermark format;

The watermark pattern is generated based on the starting dot matrix and the preset number of character dot matrix patterns and check dot matrix patterns, and first verification information is generated based on the check dot matrix pattern.

Optionally, the determining of the second check information based on all actual character lattice patterns in the watermark pattern includes:

Based on a preset lattice pattern comparison table, determine the character corresponding to each character lattice pattern in the watermark pattern;

The second verification information corresponding to the watermark graphics is determined based on the characters corresponding to the respective character lattice graphics and preset verification parameters.

Optionally, the determining the device information corresponding to the watermark graphic includes:

The device information corresponding to the watermark graphic is determined based on the watermark information corresponding to each character dot matrix graphic in the watermark graphic.

Optionally, after determining the actual device information corresponding to the watermark graphic, the method further includes:

When the first verification information is the same as the second verification information, it is determined that the watermark graphic has not been tampered with; otherwise, it is determined that the watermark graphic has been tampered with.

Optionally, the verification information includes one or both of a verification value and a verification lattice pattern.

In a third aspect, an embodiment of the present invention further provides a watermark adding device, including a dot matrix pattern determination unit and a watermark pattern adding unit, wherein:

The lattice pattern determination unit is used to determine the device information and the character lattice pattern corresponding to each character of the device information, and determine the check lattice pattern corresponding to the device information based on the characters of the device information;

The watermark graphic adding unit is configured to generate a watermark graphic corresponding to the device information based on the character dot matrix graphic corresponding to each character and the check dot matrix graphic, and add the watermark graphic corresponding to the device information to confidential information.

Optionally, the lattice pattern determination unit is used for:

Based on the preset lattice pattern comparison table, determine the character lattice pattern corresponding to each character;

Determine the verification information corresponding to the device information based on the characters of the device information and preset verification parameters;

The lattice pattern corresponding to the verification information is determined based on the preset lattice pattern comparison table, and the lattice pattern corresponding to the verification information is determined as the verification lattice pattern corresponding to the device information.

Optionally, the lattice pattern determination unit is used for:

Determining a starting dot matrix, arranging the starting dot matrix, the character dot matrix graphics corresponding to each character, and the check dot matrix graphics according to a preset watermark format, to generate a watermark graphic corresponding to the device information.

In a fourth aspect, an embodiment of the present invention further provides a screen image leak tracking device, including a watermark image extraction unit, an information determination unit, and a leak device determination unit, wherein:

The watermark graphic extraction unit is used to extract the watermark graphic in the acquired screen image, wherein the watermark graphic is acquired by using the watermark adding method according to any one of the first aspects;

The information determination unit is configured to determine the first inspection information based on the check lattice pattern in the watermark pattern, wherein the check lattice pattern is generated based on the character lattice pattern, and the character lattice pattern is generated based on the character lattice pattern. The device information corresponding to the device of the screen image; and for determining the second check information based on all the character lattice graphics in the watermark graphics, and determining the device information corresponding to the watermark graphics;

The leaking device determining unit is configured to determine the device information corresponding to the watermark image as the device information leaking the confidential information when the first verification information is the same as the second verification information.

Optionally, the information determining unit is used for:

determining a starting dot matrix in the screen image, and determining a preset number of character dot matrix graphics and check dot matrix graphics based on the starting dot matrix and a preset watermark format;

The watermark pattern is generated based on the starting dot matrix and the preset number of character dot matrix patterns and check dot matrix patterns, and first verification information is generated based on the check dot matrix pattern.

Optionally, the information determining unit is used for:

Based on a preset lattice pattern comparison table, determine the character corresponding to each character lattice pattern in the watermark pattern;

The second verification information corresponding to the watermark graphics is determined based on the characters corresponding to the respective character lattice graphics and preset verification parameters.

Optionally, the leakage device determining unit is used for:

The device information corresponding to the watermark graphic is determined based on the watermark information corresponding to each character dot matrix graphic in the watermark graphic.

Optionally, the leakage device determining unit is further configured to:

When the first verification information is the same as the second verification information, it is determined that the watermark graphic has not been tampered with; otherwise, it is determined that the watermark graphic has been tampered with.

Optionally, the verification information includes one or both of a verification value and a verification lattice pattern.

In a fifth aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the first aspect when the processor executes the program The steps of the watermark adding method.

In a sixth aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, the processor implements the second aspect when the processor executes the program The steps of the screen image leak tracking method.

In a seventh aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program causes the computer to execute as described in the first aspect The steps of the watermark adding method.

In an eighth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program causes the computer to execute as described in the second aspect Steps of the Screen Image Leak Tracking Method.

In a ninth aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes computer-executable instructions, which when executed by a processor are used to implement the watermark adding method according to the first aspect.

In a tenth aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes computer-executable instructions, and when executed by a processor, the instructions are used to implement the screen image leak tracking according to the second aspect method.

It can be seen from the above technical solutions that in the embodiment of the present invention, the check lattice pattern corresponding to the device information is determined based on the character lattice pattern corresponding to each character based on the device information, and the character lattice pattern corresponding to each character is determined based on the character lattice pattern of the device information. and the check lattice pattern, generate the watermark pattern corresponding to the device information, and add the watermark pattern corresponding to the device information to the confidential information. In this way, on the basis of the character lattice pattern corresponding to each character of the device information, and further combining with the check lattice pattern determined based on the characters of the device information, the watermark pattern corresponding to the device information is generated, which can prevent the watermark pattern from being damaged to a certain extent. tampering, which can effectively avoid the probability of misjudging the device information corresponding to the tampered watermark graphic in the screen image as the device information leaking confidential information when the watermark graphic is tampered with, thereby reducing misjudgment to a certain extent. rate and improve the accuracy of device information identified to leak confidential information.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a schematic flowchart of a method for adding a watermark according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a preset dot matrix graphic comparison table according to an embodiment of the present invention;

3 is a schematic diagram of a character dot matrix graphic provided by an embodiment of the present invention;

4 is a schematic diagram of a check lattice pattern provided by an embodiment of the present invention;

5 is a schematic diagram of a watermark graphic according to an embodiment of the present invention;

6 is a schematic flowchart of a method for tracking screen image leakage according to an embodiment of the present invention;

7 is a schematic diagram of a watermark graphic according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a watermarking apparatus according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a screen image leak tracking device according to an embodiment of the present invention;

10 is a logical block diagram of an electronic device provided by an embodiment of the present invention;

FIG. 11 is a logical block diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a watermark adding method provided in this embodiment, including:

S101 , determining the device information and the character lattice pattern corresponding to each character of the device information, and determining the check lattice pattern corresponding to the device information based on the characters of the device information.

Wherein, the device information refers to information corresponding to a device for viewing confidential information, and the device information may be information such as an ID, an identifier, an IP, and the like of the device.

The character bitmap is a bitmap corresponding to each character of the device information.

The check dot pattern is a dot pattern generated based on characters of device information.

In implementation, when a user views confidential information through a certain device, the device can call the internally installed software to generate a watermark graphic composed of character dot matrix graphics and check dot matrix graphics, and after adding the watermark graphic to the aforementioned confidential information , presented to the user, so that when a user takes a screenshot or takes a picture of the confidential information, the obtained screen image contains the aforementioned watermark graphic, so that the management device can extract the corresponding screen image when it receives the confidential information. Watermark graphics to identify devices leaking confidential information. Specifically, first, the device information of the device can be determined, and the character dot matrix pattern corresponding to each character in the device information can be determined. Then, the check lattice pattern corresponding to the device information can be determined based on the characters of the aforementioned device information. It can be understood that the aforementioned characters used to determine the check lattice pattern corresponding to the device information can be all characters of the device information or the device information. Some characters of the information, for example, when the device information contains letters (eg A13405), the check dot pattern corresponding to the device information can be determined only based on the characters other than letters (ie 13405) in the device information.

S102 , based on the character lattice pattern and the check lattice pattern corresponding to each character, generate a watermark pattern corresponding to the device information, and add the watermark pattern corresponding to the device information to the confidential information.

In implementation, after determining the character lattice pattern corresponding to each character of the device information and the check lattice pattern corresponding to the device information, based on the character lattice pattern corresponding to each character and the foregoing check lattice pattern, To generate the watermark graphics corresponding to the aforementioned device information, for example, the character lattice graphics corresponding to the aforementioned respective characters and the aforementioned check lattice graphics can be arranged and combined to obtain the watermark graphics corresponding to the device information. Then, the watermark graphic corresponding to the generated device information can be added to the above-mentioned confidential information, so that when a user takes a screenshot or takes a picture of the confidential information, the obtained screen image contains the above-mentioned watermarked graphic.

It can be seen from the above technical solutions that in the embodiment of the present invention, the check lattice pattern corresponding to the device information is determined based on the character lattice pattern corresponding to each character based on the device information, and the character lattice pattern corresponding to each character is determined based on the character lattice pattern of the device information. and the check lattice pattern, generate the watermark pattern corresponding to the device information, and add the watermark pattern corresponding to the device information to the confidential information. In this way, on the basis of the character lattice pattern corresponding to each character of the device information, and further combining with the check lattice pattern determined based on the characters of the device information, the watermark pattern corresponding to the device information is generated, which can prevent the watermark pattern from being damaged to a certain extent. tampering, which can effectively avoid the probability of misjudging the device information corresponding to the tampered watermark graphic in the screen image as the device information leaking confidential information when the watermark graphic is tampered with, thereby reducing misjudgment to a certain extent. rate and improve the accuracy of device information identified to leak confidential information.

Further, on the basis of the foregoing method embodiments, the character lattice pattern and the check lattice pattern may be determined based on the preset lattice pattern and the preset verification parameters, and the corresponding processing of the above step S101 may be as follows: based on the preset Dot matrix graphics comparison table, determine the character lattice graphics corresponding to each character. Determine the verification information corresponding to the device information based on the characters of the device information and the preset verification parameters; determine the bitmap corresponding to the verification information based on the preset bitmap comparison table, and determine the bitmap corresponding to the verification information as The checkpoint pattern corresponding to the device information.

The preset verification parameter refers to a preset parameter for determining verification information corresponding to the device information, such as 512.

In implementation, the character lattice pattern corresponding to each character in the above-mentioned device information can be determined based on the preset lattice pattern comparison table, and the verification information corresponding to the device information can be determined based on the character preset verification parameters of the device information. Validation can be a specific number or string. Then, the lattice pattern corresponding to the verification information can be determined based on the preset lattice pattern comparison table, and the lattice pattern corresponding to the verification information can be determined as the verification lattice pattern corresponding to the device information. In this way, the character lattice pattern and the check lattice pattern are determined based on the preset lattice pattern comparison table and the preset verification parameters, so that the management device can extract the corresponding watermark pattern when receiving the screen image containing confidential information, and can Based on the same preset lattice pattern comparison table and preset verification parameters, the device information that leaks confidential information can be determined, so that the accuracy of the device information corresponding to the watermark graphics in the determined screen image can be further improved. The false positive rate can be further reduced.

Further, on the basis of the above method embodiments, a watermark graphic corresponding to the device information can be generated in combination with the starting dot matrix and the preset watermark format, and the corresponding processing of the above step S102 can be as follows: determining the starting dot matrix, according to the preset watermark format. Arrange the starting dot matrix, the character dot matrix pattern corresponding to each character, and the check dot matrix pattern to generate the watermark pattern corresponding to the device information.

The preset watermark format refers to a preset format for generating a watermark graphic by arranging and combining a starting dot matrix, a character dot matrix pattern corresponding to each character, and a check dot matrix pattern.

In implementation, a watermark graphic corresponding to the device information may be generated by combining the starting dot matrix and the preset watermark format. Specifically, first, the starting dot matrix may be determined. Then, the above-mentioned starting dot matrix, the character dot matrix pattern corresponding to each of the above-mentioned characters, and the check dot matrix pattern can be arranged according to the preset watermark format, so as to generate the watermark pattern corresponding to the above-mentioned device information. In this way, the watermark graphics are generated according to the preset watermark format, so that when extracting the watermark graphics in the screen image containing confidential information, the watermark graphics can be extracted according to the same format, so that the extracted watermark graphics in the screen image are more accurate, and further The accuracy of the device information corresponding to the watermark graphic in the determined screen image is improved, and the misjudgment rate is reduced.

Taking the preset bitmap comparison table as shown in Figure 2 as an example, assuming that the device information is A1401, and the format of the watermark graphics is the nine-square grid format of 9*9, the character bitmap corresponding to each character of the device information can be obtained. As shown in Figure 3. It is assumed that the preset verification rule is: the verification information is equal to the remainder of the digital information in the device information and the preset verification parameter. And assuming that the preset parameter is 512 as an example, it can be obtained that the remainder of 1401 and 512 is 377, that is, the check information corresponding to the device information is 377. Then, the verification information 377 can be converted into binary 101111001 and represented by a preset format lattice. Assuming that the preset format lattice is a 3*3 lattice, the graphic representation of the verification lattice corresponding to the verification information can be shown in Figure 4 shown. Then, the starting lattice shown in FIG. 2 and each character lattice pattern of the aforementioned equipment information can be arranged in order, the aforementioned check lattice pattern can be arranged in the last grid of the nine-square grid, and the watermark pattern corresponding to the equipment information can be generated as follows: shown in Figure 5.

FIG. 6 shows a schematic flowchart of a method for tracking screen image leakage provided by this embodiment, including:

S601, extract the watermark graphic in the acquired screen image.

Wherein, the watermark graphic is obtained by adopting any watermark adding method in each method embodiment shown in FIG. 1 .

In implementation, after the leakage of confidential information, the device that leaked the confidential information can be traced, and further inquiry and accountability can be carried out according to the leaked device information, and the leakage can be determined according to the watermark pattern in the screen image and the verification information. Device Information for Confidential Information. Specifically, when the management device acquires a screen image containing confidential information (such as a screenshot, or an image such as a photo), the watermark graphic can be extracted from the aforementioned screen image.

S602: Determine the first check information based on the check dot matrix pattern in the watermark pattern.

Wherein, the first verification information refers to verification information directly determined according to the verification dot matrix pattern in the watermark pattern in the screen image.

The check lattice pattern is generated based on a character lattice pattern, and the character lattice pattern corresponds to device information of a device that generates the screen image.

In implementation, after extracting the watermark pattern in the acquired screen image, the check dot pattern can be extracted from the watermark pattern in the aforementioned screen image, for example, any watermark adding method shown in FIG. 1 can be used to extract it. Then, the first check information may be determined based on the check lattice pattern extracted from the watermark pattern.

S603: Determine the second check information based on all the character lattice patterns in the watermark pattern, and determine the device information corresponding to the watermark pattern.

Wherein, the second verification information refers to verification information determined based on all character dot matrix graphics in the watermark graphics in the screen image obtained above, for example, it may be based on all character bit matrix graphics in the watermark graphics in the screen image. obtained through analysis and calculations.

In implementation, after the watermark pattern in the screen image is extracted and the first verification information is determined, the second verification information may be determined based on all character lattice patterns in the watermark pattern in the aforementioned screen image. Then, based on all the character bitmaps in the watermark graphics in the above-mentioned screen image, it can be determined that the device information that may leak the above-mentioned confidential information, for example, it can be determined according to a preset bitmap comparison table (see FIG. 2) that may be leaking the above-mentioned confidential information. The device information of the device of the confidential information, the device information may be information such as the ID, identification, and IP of the device.

S604, when the first verification information is the same as the second verification information, determine the device information corresponding to the watermark image as the device information leaking confidential information.

In implementation, after determining the second verification information and determining the device information corresponding to the watermark image, it can be determined whether the first verification information and the second verification information are the same. When the first verification information and the aforementioned When the second verification information is the same, the aforementioned device information obtained based on the watermark in the screen image may be determined as the device information leaking confidential information. Otherwise, it is considered that the watermark graphic in the screen image is an invalid graphic, and the verification fails. It can be understood that, since the first verification information is directly determined according to the verification lattice pattern extracted from the above-mentioned screen image, the second verification information is determined based on all character lattice patterns in the watermark graphics in the screen image, Therefore, when one or more of all the character lattice patterns in the watermark pattern in the screen image are tampered with, the first check information and the second check information may be different.

It can be known from the above technical solutions that in the embodiment of the present invention, the first verification information is determined based on the verification dot matrix pattern in the watermark graphic in the screen image, and the second verification information is calculated based on all the character dot matrix graphics in the watermark graphic, When the first verification information is the same as the second verification information, the device information corresponding to the watermark image is determined as the device information leaking confidential information. In this way, on the basis of the watermark graphics, the first verification information directly determined based on the verification dot matrix graphics in the watermark graphics in the screen image is further combined, and the first verification information determined based on all the character bit matrix graphics in the watermark graphics in the screen image is further combined. The second verification information of the watermark is determined to determine the device information that leaks the confidential information, and only when the first verification information is the same as the second verification information, the device information corresponding to the watermark pattern is determined as the device information that leaks the confidential information, so that the To a certain extent, when the watermark graphic is tampered with, the probability of misjudging the device information corresponding to the watermark graphic in the screen image as the device information leaking confidential information can be avoided. Accuracy of device information leaking confidential information.

Further, on the basis of the above method embodiments, the watermark graphics in the screen image may be determined based on the preset watermark format, and the corresponding processing of the above step S602 may be as follows: determining a starting dot matrix in the screen image, based on the starting dot matrix and a preset watermark format, determine a preset number of character lattice graphics and check lattice graphics; The first verification information is generated by verifying the lattice pattern.

The preset watermark format refers to a preset format for generating a watermark graphic, such as a 9*9 nine-square format.

The starting dot matrix refers to the first dot matrix in each preset watermark pattern, that is, the dot matrix that marks the beginning of the watermark pattern. For example, the starting symbol in FIG. 2 can be set as the starting dot matrix.

The preset number refers to the number of character lattice graphics that should be included in the watermark graphics determined based on the preset watermark format.

In implementation, after receiving the screen image, first, the starting dot matrix can be determined in the screen image. For example, the specific pattern of the starting dot matrix can be found in the screen image according to the specific pattern of the starting dot matrix set above. The same pattern is determined as the starting lattice. Then, according to the preset watermark format, a preset number of character lattice patterns and check lattice patterns can be determined from the starting lattice. Afterwards, the watermark pattern in the screen image can be generated based on the aforementioned starting dot matrix, the aforementioned character dot matrix pattern, and the aforementioned check dot matrix pattern. Then, the first verification information may also be generated based on the aforementioned verification lattice pattern.

Take the watermark graphic in the screen image as an example as shown in Figure 5, where the first dot matrix is the starting dot matrix, the second to sixth are character dot matrix graphics, and the seventh and eighth dot matrix graphics are blank dot matrixes. That is, there is no dot matrix with characters or check values, and the ninth is the check dot pattern. It can be understood that the foregoing process of acquiring the watermark pattern and extracting the first verification information may be the inverse process of the foregoing adding the watermark pattern to the confidential information, which will not be repeated here. In this way, determining the watermark pattern according to the starting lattice can further improve the accuracy of determining the watermark pattern, thereby further reducing the misjudgment rate and improving the accuracy of the determined device information leaking confidential information. At the same time, determining the watermark pattern according to the starting dot matrix can also effectively improve the speed of determining the watermark pattern, thereby effectively improving the efficiency of determining the device information leaking confidential information.

Further, on the basis of the above method embodiments, the second verification information can also be determined according to all the character lattice graphics in the watermark graphics, and the corresponding part of the processing of the above step S603 can be as follows: based on the preset lattice graphics comparison table , determine the watermark information corresponding to each character dot-matrix pattern in the watermark pattern; determine the second check information corresponding to the watermark pattern based on the watermark information corresponding to each character dot-matrix pattern and the preset check parameters.

Wherein, the second verification information refers to verification information determined according to each character lattice pattern of the watermark graphic in the acquired screen image.

The preset dot matrix graphic comparison table refers to the preset relationship of each character, as shown in FIG. 2 .

The watermark information refers to characters corresponding to each dot matrix in the preset dot matrix graphic comparison table, such as characters that may appear in device information.

In implementation, after the watermark graphic in the screen image is acquired, the second verification information corresponding to the watermark graphic can be determined. Specifically, first, the watermark information corresponding to each character bitmap can be determined according to a preset bitmap comparison table. Then, the second verification information actually corresponding to the watermark graphics can be calculated based on the watermark information corresponding to the respective character lattice graphics determined above and the preset verification parameters, so as to be based on the watermark graphics in the aforementioned screen image, the above-mentioned first verification information The verification information and the aforementioned second verification information are used to determine the device information that leaks the confidential information. It can be understood that the aforementioned process of acquiring the watermark graphic in the screen image and extracting the first verification information may be the reverse process of the aforementioned adding the watermark graphic to the confidential information, which will not be repeated here. In this way, the watermark information is determined based on the preset dot matrix graphic comparison table, and the second verification information is determined based on the watermark information and the preset verification parameters, so that the determined second verification information can be more accurate, and the determined second verification information can be further improved. accuracy of information on devices that leak confidential information.

Further, on the basis of the above method embodiments, the device information corresponding to the watermark graphics can be determined based on the character bitmap graphics, and the corresponding part of the processing in step S604 can be as follows: based on the watermark corresponding to each character bitmap graphics in the watermark graphics information to determine the device information corresponding to the watermark graphic.

In implementation, after the second verification information is determined, the device information corresponding to the watermark image may be determined based on the watermark image in the screen image. Specifically, first, the watermark information corresponding to each character bitmap in the above watermark graphics, that is, the specific character corresponding to each character bitmap, can be determined based on the above-mentioned preset bitmap comparison table. Then, the device information corresponding to the screen image can be obtained by combining the watermark information according to the sequence of the character bitmap. In this way, the device information corresponding to the watermark graphics in the screen image is determined based on the watermark information corresponding to each character dot matrix graphics, which can further improve the accuracy of the determined device information corresponding to the watermark graphics in the screen image.

Further, on the basis of the above method embodiments, after judging whether the first verification information and the second verification information are the same, it can also be determined whether the watermark image has been tampered with, and the corresponding processing can be as follows: when the first verification information and the second verification information are the same When the second check information is the same, it is determined that the watermark image has not been tampered with; otherwise, it is determined that the watermark image has been tampered with.

In the implementation, after judging whether the first verification information and the second verification information are the same, it can also be determined whether the watermark graphic in the screen image has been tampered with according to the judgment result. Specifically, if the first verification information is the same as the second verification information, it can be considered that the watermark graphic in the screen image has not been tampered with, that is, the watermark graphic in the screen image is an originally generated watermark graphic. If the first verification information is different from the second verification information, it can be considered that the watermark graphic in the screen image has been tampered with. In this way, according to whether the first verification information and the second verification information are the same, it is determined whether the watermark image has been tampered with, which can not only provide more basis for accountability for the leakage of confidential information, but also further reduce the misjudgment rate and improve the certainty Accuracy of device information leaking confidential information.

It can be understood that, assuming that the watermark graphic in the screen image is shown in Figure 5, the above-mentioned first verification information can be obtained directly from the last grid (ie, the verification lattice graphic) of the nine-square grid in Figure 5. The verification information can be expressed as 377; the above-mentioned second verification information can be calculated according to the first eight grids of the nine-square grid in FIG. 377. At this time, the first verification information is the same as the second verification information, then the device information A1401 corresponding to the watermark graphic determined based on the watermark information corresponding to each character dot matrix graphic in the watermark graphic in the screen image can be determined as Device information that leaks confidential information.

Conversely, if one or more of all character bitmaps in the watermark graphic in the screen image have been tampered with, then the device information determined based on all the character bitmaps in the watermark graphic in the screen image will be the same as the one actually generated. The device information for this screen image is different. Taking the watermark graphic in the screen image as shown in Figure 7 as an example, according to Figure 7, it can be obtained that the first verification information is 377, and the second verification information is 457, which is the remainder of 1481 and 512. At this time, the first verification information 377 and The second verification information 457 is obviously different, so the device information A1481 determined based on the watermark image in FIG. 7 at this time is not the device information that actually generated the screen image.

It should be noted that, in implementation, the check dot pattern in the watermark pattern in the screen image may also be tampered with. When the check dot pattern is tampered with, the first check information and the second check information corresponding to the watermark pattern in the determined screen image may also be different, and the specific determination method is the same as the method provided in the above method embodiment, It is not repeated here.

It can be understood that the verification information (including the first verification information and the second verification information, etc.) mentioned in the above method embodiments may include one or both of a verification value and a verification lattice pattern. When the verification information is a verification value or a verification lattice pattern, mutual conversion can be performed based on preset verification parameters, or the verification value or the verification lattice pattern can be directly determined as the verification information. Or when the verification information includes a verification value and a verification lattice pattern, one of them may be selected for the execution process of the above method embodiments, or both the verification value and the verification lattice pattern may be used in the above method embodiments. execution process.

It can be understood that the execution of the foregoing method embodiments may be performed by a specific device in which software with functions corresponding to the foregoing method embodiments is installed, and the device may execute the processes of the foregoing method embodiments through the foregoing software.

FIG. 8 shows a watermark adding apparatus provided in this embodiment, including a dot matrix pattern determining unit 801 and a watermark pattern adding unit 802, wherein:

The lattice pattern determination unit 801 is configured to determine the device information and the character lattice patterns corresponding to each character of the device information, and determine the check lattice pattern corresponding to the device information based on the characters of the device information;

The watermark graphic adding unit 802 is configured to generate a watermark graphic corresponding to the device information based on the character dot matrix graphic corresponding to each character and the check dot matrix graphic, and add the watermark graphic corresponding to the device information. Added to Confidential Information.

Optionally, the lattice pattern determination unit 801 is used for:

Based on the preset lattice pattern comparison table, determine the character lattice pattern corresponding to each character;

Determine the verification information corresponding to the device information based on the characters of the device information and preset verification parameters;

The lattice pattern corresponding to the verification information is determined based on the preset lattice pattern comparison table, and the lattice pattern corresponding to the verification information is determined as the verification lattice pattern corresponding to the device information.

Optionally, the lattice pattern determination unit 801 is used for:

Determining a starting dot matrix, arranging the starting dot matrix, the character dot matrix graphics corresponding to each character, and the check dot matrix graphics according to a preset watermark format, to generate a watermark graphic corresponding to the device information.

The watermark adding apparatus described in this embodiment can be used to execute the method embodiments of the above-mentioned watermarking method, and the principles and technical effects thereof are similar, and are not repeated here.

FIG. 9 shows a screen image leak tracking device provided in this embodiment, including a watermark graphic extraction unit 901, an information determination unit 902, and a leak device determination unit 903, wherein:

The watermark graphic extraction unit 901 is configured to extract the watermark graphic in the acquired screen image, wherein the watermark graphic is acquired by using the watermark adding method described in any one of the first aspect;

The information determination unit 902 is configured to determine the first check information based on the check dot pattern in the watermark pattern, wherein the check dot pattern is generated based on the character dot pattern, and the character dot pattern is the same as the one. The device information corresponding to the device that generates the screen image; and the second check information is determined based on all the character lattice graphics in the watermark graphics, and the device information corresponding to the watermark graphics is determined;

The leaking device determining unit 903 is configured to, when the first verification information is the same as the second verification information, determine the device information corresponding to the watermark image as the device information that leaks the confidential information.

Optionally, the information determining unit 902 is configured to:

determining a starting dot matrix in the screen image, and determining a preset number of character dot matrix graphics and check dot matrix graphics based on the starting dot matrix and a preset watermark format;

The watermark pattern is generated based on the starting dot matrix and the preset number of character dot matrix patterns and check dot matrix patterns, and first verification information is generated based on the check dot matrix pattern.

Optionally, the information determining unit 902 is configured to:

Based on a preset lattice pattern comparison table, determine the character corresponding to each character lattice pattern in the watermark pattern;

The second verification information corresponding to the watermark graphics is determined based on the characters corresponding to the respective character lattice graphics and preset verification parameters.

Optionally, the leakage device determining unit 903 is configured to:

The device information corresponding to the watermark graphic is determined based on the watermark information corresponding to each character dot matrix graphic in the watermark graphic.

Optionally, the leakage device determining unit 903 is further configured to:

When the first verification information is the same as the second verification information, it is determined that the watermark graphic has not been tampered with; otherwise, it is determined that the watermark graphic has been tampered with.

Optionally, the verification information includes one or both of a verification value and a verification lattice pattern.

The screen image leak tracking device described in this embodiment can be used to perform the above method embodiments for screen image leak tracking, and the principles and technical effects thereof are similar, and details are not described herein again.

As shown in FIG. 10 , an embodiment of the present invention further provides an electronic device, and the electronic device may include: a processor (processor) 1001, a memory (memory) 1002, and a bus 1003;

in,

The processor 1001 and the memory 1002 communicate with each other through the bus 1003;

The processor 1001 is configured to call the program instructions in the memory 1002 to execute the methods provided by the various method embodiments of the above watermark adding methods.

As shown in FIG. 11 , an embodiment of the present invention further provides an electronic device, and the electronic device may include: a processor (processor) 1101, a memory (memory) 1102, and a bus 1103;

in,

The processor 1101 and the memory 1102 communicate with each other through the bus 1103;

The processor 1101 is configured to call the program instructions in the memory 1102 to execute the methods provided by the various method embodiments of the above-mentioned screen image leak tracking method.

In addition, the above-mentioned logic instructions in the memory 1002/memory 1102 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

On the other hand, an embodiment of the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program is implemented by a processor to execute the methods provided by each method embodiment of the above-mentioned watermarking method. Methods.

On the other hand, an embodiment of the present invention further provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, it is implemented to execute each method embodiment of the above-mentioned screen image leak tracking method provided method.

On the other hand, this embodiment also provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, when the program instructions are When executed by a computer, the computer can execute the methods provided by the above method embodiments of the watermarking method.

On the other hand, this embodiment also provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, when the program instructions are When executed by the computer, the computer can execute the methods provided by the above method embodiments of the screen image leak tracking method.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (14)

1. A watermarking method, comprising:

determining equipment information and a character dot matrix graph corresponding to each character of the equipment information, and determining a check dot matrix graph corresponding to the equipment information based on the character of the equipment information;

and generating a watermark pattern corresponding to the equipment information based on the character dot matrix pattern corresponding to each character and the check dot matrix pattern, and adding the watermark pattern corresponding to the equipment information to secret information.

2. The watermark pattern adding method according to claim 1, wherein the determining of the device information and the character dot pattern corresponding to each character of the device information includes:

determining a character dot matrix graph corresponding to each character based on a preset dot matrix graph comparison table;

the determining a check dot matrix pattern corresponding to the device information based on the characters of the device information includes:

determining verification information corresponding to the equipment information based on the characters of the equipment information and preset verification parameters;

and determining the dot matrix graph corresponding to the verification information based on the preset dot matrix graph comparison table, and determining the dot matrix graph corresponding to the verification information as the verification dot matrix graph corresponding to the equipment information.

3. The watermark pattern adding method according to claim 1, wherein the generating of the watermark pattern corresponding to the device information based on the character dot pattern corresponding to each character and the check dot pattern includes:

and determining an initial dot matrix, arranging the initial dot matrix, the character dot matrix graph corresponding to each character and the check dot matrix graph according to a preset watermark format, and generating a watermark graph corresponding to the equipment information.

4. A screen image leakage tracking method, comprising:

extracting a watermark pattern in the acquired screen image, wherein the watermark pattern is acquired by adopting the watermark adding method of any one of claims 1-3;

determining first inspection information based on a check dot matrix graph in the watermark graph, wherein the check dot matrix graph is generated based on a character dot matrix graph, and the character dot matrix graph corresponds to equipment information of equipment for generating the screen image;

determining second check information based on all character dot matrix graphs in the watermark graphs, and determining equipment information corresponding to the watermark graphs;

and when the first check information is the same as the second check information, determining the equipment information corresponding to the watermark pattern as the equipment information which leaks the secret information.

5. The screen image leakage tracking method of claim 4, wherein the determining the first check information based on the check dot pattern in the watermark pattern comprises:

determining an initial dot matrix in the screen image, and determining a preset number of character dot matrix graphs and check dot matrix graphs based on the initial dot matrix and a preset watermark format;

and generating the watermark graph based on the initial dot matrix, the preset number of character dot matrix graphs and the check dot matrix graph, and generating first check information based on the check dot matrix graph.

6. The screen image leakage tracking method of claim 5, wherein said determining second check information based on all actual character dot patterns in the watermark pattern comprises:

determining characters corresponding to each character dot matrix graph in the watermark graph based on a preset dot matrix graph comparison table;

and determining second check information corresponding to the watermark graph based on the characters corresponding to the character dot matrix graphs and preset check parameters.

7. The screen image leakage tracking method of claim 6, wherein the determining the device information corresponding to the watermark pattern comprises:

and determining equipment information corresponding to the watermark pattern based on the watermark information corresponding to each character dot matrix pattern in the watermark pattern.

8. The screen image leakage tracking method according to claim 7, wherein after determining the actual device information corresponding to the watermark pattern, further comprising:

and when the first check information is the same as the second check information, determining that the watermark pattern is not tampered, otherwise, determining that the watermark pattern is tampered.

9. The screen image leakage tracking method according to any one of claims 4 to 8, wherein the verification information includes one or both of a verification value and a verification dot pattern.

10. A watermark adding apparatus includes a dot pattern determining unit and a watermark pattern adding unit, wherein:

the dot matrix graph determining unit is used for determining equipment information and character dot matrix graphs corresponding to all characters of the equipment information, and determining check dot matrix graphs corresponding to the equipment information based on the characters of the equipment information;

and the watermark pattern adding unit is used for generating a watermark pattern corresponding to the equipment information based on the character dot pattern corresponding to each character and the check dot pattern, and adding the watermark pattern corresponding to the equipment information to secret information.

11. A screen image leakage tracking device is characterized by comprising a watermark image extraction unit, an information determination unit and a leakage equipment determination unit, wherein:

the watermark pattern extraction unit is used for extracting a watermark pattern in the acquired screen image, wherein the watermark pattern is acquired by adopting the watermark adding method of any one of claims 1 to 3;

the information determining unit is used for determining first checking information based on a check dot matrix graph in the watermark graph, wherein the check dot matrix graph is generated based on a character dot matrix graph, and the character dot matrix graph corresponds to equipment information of equipment for generating the screen image; the device is used for determining second check information based on all character dot matrix graphs in the watermark graphs and determining device information corresponding to the watermark graphs;

and the leaked device determining unit is used for determining the device information corresponding to the watermark pattern as the device information which leaks the confidential information when the first check information is the same as the second check information.

12. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the watermarking method according to any one of claims 1 to 3 or the screen image leakage tracking method according to any one of claims 4 to 9 when executing the program.

13. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the watermarking method according to any one of claims 1 to 3 or the screen image leakage tracking method according to any one of claims 4 to 9.

14. A computer program product comprising computer executable instructions for implementing a watermarking method according to any one of claims 1 to 3 or a screen image leakage tracking method according to any one of claims 4 to 9 when executed by a processor.

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