CN115048665A - Excel file-based information hiding method, device, equipment and storage medium - Google Patents

Abstract

The present disclosure provides an information hiding method, device, device and storage medium based on an Excel file. The method includes: reading an Excel file into a binary stream file, and parsing the binary stream file based on a compound document structure to obtain a compound document containing a plurality of general markup language texts; performing encryption operations on original information to obtain a watermark code, which is based on a predetermined The encoding rules of the picture files in the format, the watermark encoding is processed to obtain the watermark picture; based on the watermark picture and picture information, multiple general markup language texts in the compound document are modified to add the watermark picture to the cell; based on the watermark The encoding modifies the property file of the compound document, so as to inject the watermark encoding into at least one tag in the property file, to obtain the watermarked picture and the Excel file after the watermark encoding is injected. The hidden information added by the present disclosure is not easy to be perceived, optimized, and cracked, and has stronger robustness.

Description

Information hiding method, device, device and storage medium based on Excel file

technical field

The present disclosure relates to the field of computer technology, and in particular, to an Excel file-based information hiding method, device, device, and storage medium.

Background technique

At present, there are many protection schemes for Excel files. By adding visible text watermarks or background image watermarks to the Excel files, the protection of the Excel files can be realized. As a novel information hiding technology, digital watermarking provides a solution to a series of problems such as copyright protection, source authentication, document leakage, user tracking, and identity authentication on the open network.

In the prior art, the following two ways are mainly adopted to protect the Excel file. The first way is to achieve the protection effect by adding a visible text watermark or a background image watermark in the Excel file, but this way can destroy the file's The second method is to achieve file protection by modifying the XML tag attributes in the Excel file structure, but this method is used in Other software (such as WPS) will be optimized out when saving, so that the watermark information will be lost.

Therefore, the existing method of protecting the Excel file by adding information has the problems of high watermark information perception, easy identification and optimization of information, easy cracking of information, and poor robustness.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present disclosure provide an information hiding method, device, device and storage medium based on an Excel file, so as to solve the problem that the watermark information existing in the prior art has a high degree of perception, information is easily identified and optimized, and information is easily stored. Crack, the problem of poor robustness.

A first aspect of the embodiments of the present disclosure provides an information hiding method based on an Excel file, including: reading an Excel file to be processed as a binary stream file, and parsing the binary stream file based on a predetermined composite document structure, Obtain a compound document containing multiple general markup language texts; obtain the original information for hiding, perform encryption operations on the original information, obtain the watermark code corresponding to the original information, and process the watermark code based on the encoding rules of the picture file in a predetermined format. Obtain the watermark image; based on the watermark image and the image information corresponding to the watermark image, modify multiple general markup language texts in the compound document, so as to add the watermark image to the cells in the Excel file; The property file is modified so that the watermark code is injected into at least one tag in the property file of the compound document, and the watermark picture and the Excel file after the watermark code is injected are obtained.

A second aspect of the embodiments of the present disclosure provides an Excel file-based information hiding device, including: a reading module configured to read the Excel file to be processed as a binary stream file, and based on a predetermined compound document structure The binary stream file is parsed to obtain a composite document containing multiple general markup language texts; the encoding module is configured to obtain original information for hiding, perform encryption operations on the original information, and obtain the watermark code corresponding to the original information, based on the predetermined The encoding rules of the picture files in the format, the watermark encoding is processed to obtain the watermark picture; the add module is configured to modify the multiple general markup language texts in the compound document based on the watermark picture and the picture information corresponding to the watermark picture, so that the The watermark image is added to the cell in the Excel file; the injection module is configured to modify the property file of the compound document based on the watermark code, so as to inject the watermark code into at least one tag in the property file of the compound document, and get added Watermark pictures and Excel files that have been encoded with watermarks.

In a third aspect of the embodiments of the present disclosure, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above method when executing the program.

In a fourth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the foregoing method are implemented.

The above-mentioned at least one technical solution adopted in the embodiments of the present disclosure can achieve the following beneficial effects:

By reading the Excel file to be processed as a binary stream file, and parsing the binary stream file based on a predetermined composite document structure, a composite document containing multiple universal markup language texts is obtained; The information is encrypted by performing an encryption operation to obtain the watermark code corresponding to the original information. Based on the encoding rules of the picture file in the predetermined format, the watermark code is processed to obtain a watermark picture; Common Markup Language text is modified to add watermark images to cells within the Excel file; properties files of compound documents are modified based on the watermark encoding to inject the watermark encoding into at least one tag in the properties file of the compound document , to get the Excel file after adding the watermark image and injecting the watermark encoding. The hidden information added by the present disclosure is not easy to be perceived, optimized, and cracked, and has stronger robustness.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present disclosure 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 for the present disclosure. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic flowchart of an Excel file-based information hiding method provided by an embodiment of the present disclosure;

2 is a schematic structural diagram of an Excel file-based information hiding device provided by an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and techniques are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.

As described in the background art, the existing protection scheme for Excel files can achieve the protection effect by adding a visible text watermark or a background image watermark in the Excel file, or by adding a watermark to the XML tag attribute of the Excel file structure coding to achieve protection. However, adding a visible text watermark or background image watermark to an Excel file will not only bring a strong perception and be easily recognized, but also the watermark can be cracked by destroying the file; modify the XML in the Excel file structure The method of label attributes will be optimized when using WPS software to save, so that the watermark information is lost, and the purpose of hiding information in the Excel file cannot be achieved.

In view of the problems existing in the above-mentioned prior art, the present disclosure finds that the Excel document of the OOXML structure can be inserted into the cell picture by modifying the OOXML structure, and the picture carrying the user's watermark information can be added to the cell of the Excel document, and the The visible width and height of the watermark image are set to 0, so as to achieve the purpose of imperceptibility. Since the function of inserting horizontal pictures into cells of Excel documents is completely implemented, the Excel documents with horizontal pictures added will be regarded as normal structures and will not be optimized. In addition, by studying the OOXML structure, you can also modify specific XML files to achieve the purpose of modifying file attributes.

Aiming at the problems of high perception, low watermark robustness, and easy loss of watermark information in the prior art, the present disclosure proposes an information hiding method based on an OOXML structure of Excel files. The OOXML structure of the file is parsed, and the watermark information is hidden in the table cells and file attributes. Using the Excel file processed by the technical solution of the present disclosure, the hidden information is not easy to be perceived, and it is not easy to be optimized and cracked, and it has stronger robustness sex.

The technical solutions of the table data processing method provided by the embodiments of the present disclosure will be fully described below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic flowchart of an information hiding method based on an Excel file provided by an embodiment of the present disclosure. The Excel file-based information hiding method of FIG. 1 may be performed by a system server. As shown in Figure 1, the information hiding method based on the Excel file may specifically include:

S101, read the Excel file to be processed as a binary stream file, and parse the binary stream file based on a predetermined composite document structure to obtain a composite document containing a plurality of general markup language texts;

S102, obtaining original information for hiding, performing encryption operation on the original information, obtaining a watermark code corresponding to the original information, and processing the watermark code based on the encoding rule of the picture file in a predetermined format to obtain a watermark picture;

S103, based on the watermark picture and the picture information corresponding to the watermark picture, modify a plurality of general markup language texts in the compound document, so that the watermark picture is added to the cell in the Excel file;

S104, modifying the property file of the compound document based on the watermark encoding, so as to inject the watermark encoding into at least one tag in the property file of the compound document, to obtain a watermarked picture and an Excel file after the watermark encoding is injected.

Specifically, the Excel file in the embodiment of the present disclosure is a table file, and the Excel file includes several cells. The predetermined compound document structure refers to the OOXML structure corresponding to the Excel file. The full name of OOXML is Office Open XML, also known as OpenXML. OOXML is an XML-based office document format, including word processing documents, spreadsheets, presentations, and charts. Charts, shapes and other graphic materials. The technical specification developed by Microsoft for Office 2007 products has become an international document format standard, and is compatible with the former international standard ODF (Open Document Format) and the Chinese document standard UOF (Unified Office Document Format).

Further, the general markup language text refers to an XML file that constitutes an OOXML structure, and XML is an abbreviation of Extensible Markup Language (XML), a markup language used to mark electronic files to make them structural, and can be used to mark data. , define data types, is a source language that allows users to define their own markup language. A compound document is an OOXML structured document. The OOXML structured document contains multiple XML files, and each XML file is used to store different information.

According to the technical solutions provided by the embodiments of the present disclosure, by reading the Excel file and using the OOXML structure to parse the Excel file, an OOXML structure document containing a plurality of XML files is obtained, and original information for hiding (that is, the user's account ID, access time and other information), use the MD5 encryption algorithm to obtain a hexadecimal code with a length of 32 bits, and use this hexadecimal code as a complete watermark encoding. and transparency information, process the watermark encoding to get the watermark image; finally, add the watermark image to the cell of the Excel file by modifying the OOXML structure of the Excel file, and inject the watermark encoding into the property file by modifying the property file in the OOXML structure To modify the properties of the Excel file, the modified Excel file not only contains the cells after inserting the watermark picture, but also contains the watermark encoding information in the file properties of the modified Excel file. The hidden information in the Excel file of the present disclosure is not easy to be noticed by the user, difficult to be optimized and deciphered, and has extremely strong robustness.

In some embodiments, before reading the Excel file to be processed as a binary stream file, the method further includes: acquiring the Excel file downloaded by the user from the system, using the downloaded Excel file as the Excel file to be processed, and When the user downloads the Excel file, the user's account ID and user access time are obtained.

Specifically, the Excel file downloaded by the user in the internal platform system of the enterprise needs to be embedded with personal information, which can not only effectively prevent the user from leaking the internal file of the enterprise, but also obtain the file by tracing the source of the file through the watermark after the file is leaked. The watermark information carried in the file can be traced back to the user who leaked the file information by querying the database for the watermark information to obtain the user information corresponding to the watermark information.

Further, take the Excel file downloaded by the user as the Excel file to be processed, when the user downloads the file through the enterprise internal platform, obtain the user's unique account ID (that is, the account ID) and the user access time, that is, record the user's access to the enterprise internal platform. time, and use this information as the basic information when generating watermark coding.

In some embodiments, the composite document structure adopts an OOXML structure; the Excel file to be processed is read as a binary stream file, and the binary stream file is parsed based on a predetermined composite document structure to obtain a composite document containing multiple general markup language texts Documents, including: reading the Excel file to be processed so as to read it as a binary stream file, parsing the binary stream file based on the OOXML structure of the Excel file, and obtaining an OOXML document corresponding to the Excel file, wherein the OOXML document contains A plurality of common markup language texts, and the common markup language texts are XML files.

Specifically, when reading an Excel file, the Excel file is read as a binary stream file, and then based on the OOXML structure of the Excel file, the read binary stream file is parsed to obtain the OOXML document corresponding to the Excel file, the OOXML document contains multiple XML files. In practical applications, each XML file corresponds to a different composition structure of the OOXML document, such as the xl/media structure.

In some embodiments, acquiring original information for hiding, performing an encryption operation on the original information, and obtaining a watermark code corresponding to the original information, includes: acquiring an account identifier, user access time, and a pre-generated random value, converting the account identifier, user The access time and the random value form a string, and the watermark code is obtained by calculating the string with an encryption algorithm; wherein, the encryption algorithm adopts the MD5 encryption algorithm, and the watermark code is a hexadecimal code with a length of 32 bits.

Specifically, before generating the watermark information, first obtain the user's account ID (that is, the unique account ID), the user's access time and the pre-generated random value, and use the MD5 encryption algorithm and PNG through the obtained basic information for generating the watermark. Encoding rules for pictures, and further generate watermark pictures. In practical applications, the picture files in the predetermined format include but are not limited to picture formats supported by Excel files such as PNG and JPG.

Further, according to the account ID, the user access time and the pre-generated random value, a string of strings with rules of 0-9 and a-z is formed; and the MD5 algorithm is used to calculate the string, and a string of 16 characters with a length of 32 bits is obtained. Hexadecimal encoding, use this encoding as the complete encoding of the watermark, for example, mark the complete encoding of the watermark as M. It should be noted that, when generating the watermark code in the embodiments of the present disclosure, it is not limited to the method of using the MD5 algorithm to obtain a 32-bit hexadecimal code. Other generation rules are also applicable, for example, other asymmetric encryption algorithms are used, and the watermark The length of the encoding can also choose any length (such as 16-bit encoding).

In some embodiments, based on the encoding rules of the picture files in the predetermined format, the watermark encoding is processed to obtain the watermark pictures, including: analyzing the binary file structure of the picture files in the predetermined format to obtain the encoding rules of the picture files in the predetermined format; The watermark code is used as the color and transparency information of the picture file in a predetermined format, and the watermark code is processed by encoding rules to obtain a watermark picture; wherein, the picture file in the predetermined format adopts the picture file in PNG format.

Specifically, after generating the watermark code, by analyzing the binary file structure of the PNG image, the encoding rule of the PNG image file is obtained, the watermark code M is used as the color and transparency information of the watermark image, and the encoding rule of the PNG image file is used. Encode M for processing to generate a 2px*2px PNG image, use the generated PNG image as a watermark image, and mark the watermark image as P.

Further, after generating the watermark code and the watermark picture, the embodiment of the present disclosure transfers the user-related information and the watermark by means of the Hyper Text Transfer Protocol (Hyper Text Transfer Protocol, HTTP) or the HTTP channel (Hyper Text Transfer Protocol over SecureSocket Layer, HTTPS). The information is transmitted to the server and stored in the database. In practical applications, the user-related information not only includes the user's unique account ID, but also includes the basic information of the Excel file, and the related information generated by the user accessing the Excel file.

After the watermark code and the watermark picture are generated, the embodiment of the present disclosure modifies the OOXML structure of the Excel file, so that the watermark code and the watermark picture are respectively added to the cell and the file attribute, thereby reducing the user's perceptibility and achieving the hidden information. Purpose. The ways of adding the two kinds of information will be described in detail below with reference to specific embodiments.

In some embodiments, based on the watermark picture and the picture information corresponding to the watermark picture, modifying multiple general markup language texts in the compound document, including: based on the watermark picture and the picture information of the watermark picture, modifying the multiple The general markup language text is modified, the watermark picture is inserted into the first general markup language text, the label of the watermark picture is inserted into the second general markup language text, and the position and size information of the watermark picture is inserted into the third general markup language text, A tag associated with the watermark image is inserted into the fourth universal markup language text and the fifth universal markup language text, and a Default tag and an Override tag are inserted into the sixth universal markup language text.

Specifically, the picture information of the watermark picture includes information such as the label, position, size, and associated label of the watermark picture. By modifying the OOXML structure of the Excel file, the PNG picture carrying the watermark encoding information is inserted into the cell of the Excel file. , in order to hide the watermark image in the cell of the Excel file, and the cell for adding the watermark image can be a preset cell or a randomly selected cell.

Further, modify a plurality of general markup language texts in the OOXML document, first insert PNG pictures (ie watermark pictures) in the xl/media structure, insert watermark picture tags in xl/worksheets/sheet1.XML, and in xl/ Insert the position information and size information of the watermark image in drawings/drawing1.XML, insert the associated tags of the file in xl/worksheets/_rels/sheet1.XML.rels and xl/drawings/_rels/drawing1.XML.rels, in [Content_Types ].XML Insert Default and Override tags, and additional XML files and types need to be declared in this file.

Further, xl/media corresponds to the first general markup language text, and xl/media is used to store pictures of Excel tables; xl/worksheets/sheet1.XML corresponds to the second general markup language text, and xl/drawings/drawing1.XML corresponds to the third one. Generic Markup Language text, xl/worksheets/_rels/sheet1.XML.rels and xl/drawings/_rels/drawing1.XML.rels correspond to the fourth Generic Markup Language text and the fifth Generic Markup Language text, respectively, [Content_Types].XML corresponds to Sixth Universal Markup Language text.

Further, by modifying the OOXML structure of the Excel file, a PNG picture (that is, a watermark picture) is inserted into the cell of the Excel file, and the visible size of the picture can be set to 0, and the position of the picture can be at any cell location.

In some embodiments, modifying the property file of the compound document based on the watermark code, so as to inject the watermark code into at least one tag in the property file of the compound document, includes: obtaining the property file of the OOXML document, and injecting the watermark code into the property file of the OOXML document. In the first tag of the property file, the saver in the property file is modified, and the watermark code is injected into the second tag of the property file, so as to modify the description in the property file.

Specifically, in addition to adding a watermark image to the cell of the Excel file, in order to ensure the robustness of the watermark information injection process, it is also necessary to inject the watermark code into the attribute information of the Excel file. The injection of the watermark code still needs to pass the This is achieved by modifying the OOXML structure, for example, by modifying a specific XML file within the OOXML structure to achieve the purpose of modifying file attributes.

Further, by injecting the watermark code into the cp:lastModifiedBy tag of the docProps/core.XML of the OOXML structure, the modification of the saver in the file properties is realized. In addition, by injecting the watermark code into the docProps/core.XML of the OOXML structure In the dc:description tag of the , implement the modifications described in the file attributes. In practical applications, the saver only retains the watermark codes of the latest operating users, while the description is superimposed one by one, and the watermark codes of multiple operating users can be retained.

Further, when the watermark code is injected in the embodiments of the present disclosure, only the watermark code information is added to the saver and the remarks in the file attributes. It should be understood that other attribute information of the file can also be modified in practical applications.

It should be noted that, the embodiment of the present disclosure modifies the OOXML structure of the Excel file, thereby adding the watermark image to the cell of the Excel file, and injecting the watermark code into the attribute file of the Excel, so as to realize the watermark information. hidden, to achieve the purpose of protecting Excel files from being leaked. However, it should be understood that, in the injection of the two types of watermark information provided by the above-mentioned embodiments, when any one of the watermark information is successfully injected, the watermark information of the Excel file is successfully added. Therefore, as long as any one of the watermark information is successfully added, the It protects the Excel file from being leaked, and can realize the traceability of the watermark information of the Excel file. In practical applications, the Excel file after adding watermark information can be recorded as file E.

The above embodiments have described the generation of watermark information and the process of adding watermark information in detail. The following will introduce a method for tracing the source of an Excel file after adding watermark information with reference to specific embodiments.

The embodiments of the present disclosure also provide a technical solution for the traceability of the watermark of the Excel file, and the traceability of the watermark information mainly includes the extraction and query of the watermark information. Corresponding to the two methods of adding watermark information provided in the foregoing embodiments, the watermark source tracing in the embodiment of the present disclosure also includes two methods for extracting watermark information.

First, when extracting the PNG images (ie watermark images) in the Excel file, all the PNG images stored in xl/media in the OOXML structure of the Excel file are extracted, and the extracted PNG images are filtered to filter out the size. It is a PNG image of 2px*2px. By parsing the binary file structure of the PNG image, the PNG image is decoded, the color and transparency information of the image is parsed, and the watermark code M is parsed.

Secondly, when extracting the watermark code in the Excel file, you can directly adopt the method of obtaining the encoding information of the file attribute, use Microsoft Excel or WPS to open the corresponding file, and then find the file attribute details, and the information displayed through the file attribute details, namely The watermark code M can be obtained; then, according to the obtained watermark code and the watermark code and user information in the database uploaded to the background system server, it can be traced to the user who leaked the file information by searching and comparing them.

According to the technical solutions provided by the embodiments of the present disclosure, the present disclosure hides the watermark information in the table cells and file attributes of the Excel file by parsing and modifying the OOXML structure of the Excel file, and by encoding the user's unique identification information, The encoding information is hidden in the cells and file attributes in the Excel file; and the purpose of adding cell pictures and modifying file attributes is achieved through OOXML operations; the internal system of the enterprise can record a series of user information chains operating the Excel document, At the same time store the data in the cell in the Excel file and in the file properties.

The following are the apparatus embodiments of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the apparatus embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

FIG. 2 is a schematic structural diagram of an information hiding apparatus based on an Excel file provided by an embodiment of the present disclosure. As shown in Figure 2, the information hiding device based on the Excel file includes:

The parsing module 201, configured as a reading module, is configured to read the Excel file to be processed into a binary stream file, and parse the binary stream file based on a predetermined composite document structure, to obtain a plurality of general markup language texts. compound document;

The encoding module 202 is configured to obtain the original information for hiding, perform encryption operation on the original information, obtain the watermark code corresponding to the original information, and process the watermark code based on the encoding rule of the picture file in a predetermined format to obtain a watermark picture;

The modification module 203 is configured to modify a plurality of general markup language texts in the composite document based on the watermark picture and the picture information corresponding to the watermark picture, so that the watermark picture is added to the cell in the Excel file;

The injection module 204 is configured to modify the property file of the compound document based on the watermark encoding, so as to inject the watermark encoding into at least one tag in the property file of the compound document to obtain a watermarked picture and an Excel file after the watermark encoding is injected.

In some embodiments, before reading the Excel file to be processed as a binary stream file, the parsing module 201 of FIG. 2 obtains the Excel file downloaded by the user from the system, takes the downloaded Excel file as the Excel file to be processed, and When the user downloads the Excel file, the user's account ID and user access time are obtained.

In some embodiments, the composite document structure adopts an OOXML structure; the parsing module 201 of FIG. 2 reads the Excel file to be processed so as to read it as a binary stream file, and parses the binary stream file based on the OOXML structure of the Excel file , to obtain an OOXML document corresponding to the Excel file, wherein the OOXML document contains a plurality of general markup language texts, and the general markup language texts are XML files.

In some embodiments, the encoding module 202 of FIG. 2 obtains the account identifier, the user access time and the pre-generated random value, forms a string with the account identifier, the user access time and the random value, and uses an encryption algorithm to calculate the string to obtain Watermark encoding; wherein, the encryption algorithm adopts the MD5 encryption algorithm, and the watermark encoding is a hexadecimal encoding with a length of 32 bits.

In some embodiments, the encoding module 202 of FIG. 2 analyzes the binary file structure of the picture file in the predetermined format to obtain the encoding rules of the picture file in the predetermined format; the watermark is encoded as the color and transparency information of the picture file in the predetermined format, The watermarked picture is obtained by processing the watermark encoding using the encoding rules; wherein, the picture file in the predetermined format adopts the picture file in the PNG format.

In some embodiments, the modification module 203 of FIG. 2 modifies a plurality of general markup language texts in the OOXML document based on the watermark picture and the picture information of the watermark picture, inserts the watermark picture in the first general markup language text, and inserts the watermark picture in the first general markup language text. 2. Insert the label of the watermark image into the text of the general markup language, insert the position and size information of the watermark image into the text of the third general markup language, and insert the associated label of the watermark image into the text of the fourth general markup language and the fifth general markup language. , insert the Default tag and Override tag in the sixth Generic Markup Language text.

In some embodiments, the injection module 204 of FIG. 2 obtains the properties file of the OOXML document, injects the watermark code into the first tag of the properties file, so as to modify the saver in the properties file, and injects the watermark code into the properties In the second tab of the file, in order to modify the description in the properties file.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present disclosure.

FIG. 3 is a schematic structural diagram of an electronic device 3 provided by an embodiment of the present disclosure. As shown in FIG. 3 , the electronic device 3 of this embodiment includes a processor 301 , a memory 302 , and a computer program 303 stored in the memory 302 and executable on the processor 301 . When the processor 301 executes the computer program 303, the steps in each of the foregoing method embodiments are implemented. Alternatively, when the processor 301 executes the computer program 303, the functions of the modules/units in the foregoing device embodiments are implemented.

Illustratively, the computer program 303 may be divided into one or more modules/units, which are stored in the memory 302 and executed by the processor 301 to complete the present disclosure. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 303 in the electronic device 3 .

The electronic device 3 may be an electronic device such as a desktop computer, a notebook, a palmtop computer, and a cloud server. The electronic device 3 may include, but is not limited to, the processor 301 and the memory 302 . Those skilled in the art can understand that FIG. 3 is only an example of the electronic device 3 , and does not constitute a limitation on the electronic device 3 , and may include more or less components than those shown in the figure, or combine some components, or different components For example, the electronic device may also include input and output devices, network access devices, buses, and the like.

The processor 301 may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-available processors Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 302 may be an internal storage unit of the electronic device 3 , for example, a hard disk or a memory of the electronic device 3 . The memory 302 may also be an external storage device of the electronic device 3, for example, a pluggable hard disk, a smart memory card (Smart Media Card, SMC), a Secure Digital (Secure Digital, SD) card, a flash memory card ( Flash Card), etc. Further, the memory 302 may also include both an internal storage unit of the electronic device 3 and an external storage device. The memory 302 is used to store computer programs and other programs and data required by the electronic device. The memory 302 may also be used to temporarily store data that has been or will be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion means dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this disclosure.

In the embodiments provided in the present disclosure, it should be understood that the disclosed apparatus/computer device and method may be implemented in other manners. For example, the apparatus/computer equipment embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. Multiple units or components may be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-readable storage medium. Based on this understanding, the present disclosure realizes all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program is processed when the When the device is executed, the steps of the foregoing method embodiments may be implemented. A computer program may include computer program code, which may be in source code form, object code form, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-Only Memory (ROM), random access memory Memory (Random Access Memory, RAM), electric carrier signal, telecommunication signal, software distribution medium, etc. It should be noted that the content contained in computer-readable media may be modified as appropriate in accordance with the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not be Including electrical carrier signals and telecommunication signals.

The above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions 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 disclosure, and should be included in the present disclosure. within the scope of protection.

Claims (10)

1. An information hiding method based on an Excel file is characterized by comprising the following steps:

reading an Excel file to be processed into a binary stream file, and analyzing the binary stream file based on a preset compound document structure to obtain a compound document containing a plurality of universal markup language texts;

acquiring original information for hiding, performing encryption operation on the original information to obtain a watermark code corresponding to the original information, and processing the watermark code to obtain a watermark picture based on a coding rule of a picture file with a preset format;

modifying the plurality of universal markup language texts in the compound document based on the watermark picture and the picture information corresponding to the watermark picture so as to add the watermark picture to a cell in the Excel file;

and modifying the attribute file of the compound document based on the watermark code so as to inject the watermark code into at least one label in the attribute file of the compound document, thereby obtaining the Excel file added with the watermark picture and injected with the watermark code.

2. The method according to claim 1, wherein before the reading of the Excel file to be processed into a binary stream file, the method further comprises:

the method comprises the steps of obtaining an Excel file downloaded by a user from a system, taking the downloaded Excel file as a to-be-processed Excel file, and obtaining an account identification and user access time of the user when the user downloads the Excel file.

3. The method of claim 1, wherein the compound document structure is in an OOXML structure; the reading the Excel file to be processed into a binary stream file, and analyzing the binary stream file based on a preset compound document structure to obtain a compound document containing a plurality of universal markup language texts, wherein the method comprises the following steps:

reading the Excel file to be processed so as to read the Excel file into a binary stream file, analyzing the binary stream file based on an OOXML structure of the Excel file to obtain an OOXML document corresponding to the Excel file, wherein the OOXML document comprises a plurality of universal markup language texts, and the universal markup language texts are XML files.

4. The method according to claim 2, wherein the obtaining original information for hiding, and performing an encryption operation on the original information to obtain a watermark encoding corresponding to the original information, comprises:

acquiring the account identification, the user access time and a pre-generated random value, forming a character string by the account identification, the user access time and the random value, and calculating the character string by using an encryption algorithm to obtain the watermark code; the encryption algorithm adopts an MD5 encryption algorithm, and the watermark code is a 16-system code with the length of 32 bits.

5. The method according to claim 1, wherein the processing the watermark encoding based on the encoding rule of the picture file with the predetermined format to obtain the watermark picture comprises:

analyzing the binary file structure of the picture file with the preset format to obtain the coding rule of the picture file with the preset format; taking the watermark code as the color and transparency information of the picture file with the preset format, and processing the watermark code by utilizing the coding rule to obtain a watermark picture; the picture file with the preset format adopts a picture file with a PNG format.

6. The method according to claim 1, wherein the modifying the plurality of generic markup language texts in the compound document based on the watermark picture and picture information corresponding to the watermark picture comprises:

modifying a plurality of general markup language texts in an OOXML document based on the watermark picture and the picture information of the watermark picture, inserting the watermark picture into a first general markup language text, inserting a label of the watermark picture into a second general markup language text, inserting position and size information of the watermark picture into a third general markup language text, inserting an associated label of the watermark picture into a fourth general markup language text and a fifth general markup language text, and inserting a Default label and an Override label into a sixth general markup language text.

7. The method of claim 1, wherein the modifying the property file of the compound document based on the watermark encoding to inject the watermark encoding into at least one tag within the property file of the compound document comprises:

acquiring a property file of an OOXML document, injecting the watermark code into a first label of the property file so as to modify a keeper in the property file, and injecting the watermark code into a second label of the property file so as to modify description in the property file.

8. An information hiding device based on an Excel file is characterized by comprising:

the analysis module is configured to read the Excel file to be processed into a binary stream file, and analyze the binary stream file based on a preset compound document structure to obtain a compound document containing a plurality of universal markup language texts;

the encoding module is configured to acquire original information for hiding, perform encryption operation on the original information to obtain watermark encoding corresponding to the original information, and process the watermark encoding to obtain a watermark picture based on an encoding rule of a picture file with a predetermined format;

a modification module configured to modify the plurality of universal markup language texts in the compound document based on the watermark picture and picture information corresponding to the watermark picture so as to add the watermark picture to a cell in the Excel file;

and the injection module is configured to modify the attribute file of the compound document based on the watermark coding so as to inject the watermark coding into at least one label in the attribute file of the compound document, and obtain the Excel file added with the watermark picture and injected with the watermark coding.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.

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