CN114692100A - Digital watermark adding and extracting method and device, electronic equipment and readable medium - Google Patents
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Abstract
The embodiment of the disclosure discloses a digital watermark adding method, a digital watermark extracting method, a digital watermark adding device, a digital watermark extracting device, an electronic device and a readable medium. One embodiment of the method comprises: and encrypting the information to be added with the watermark to obtain encrypted watermark information. And carrying out sectional coding on the encrypted watermark information to obtain at least one piece of coded watermark information. And generating the position information of each cell in at least one cell to which information is to be added in the spreadsheet according to the target watermark strength to obtain a position information set. At least one coded watermark information is added to at least one cell based on the set of location information. The embodiment is related to information security, improves the concealment of the watermark and ensures that the watermark is not easy to remove.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of information security, in particular to a digital watermark adding and extracting method, a digital watermark adding and extracting device, electronic equipment and a readable medium.
Background
Spreadsheets are frequently used documents that, for some documents containing sensitive data, can have many negative effects if inadvertently leaked. Watermarking is a commonly used means of copyright protection and leakage tracing. The related electronic forms are watermarked in a manner that includes: the visible watermark is added by inserting a picture at the header.
However, when watermarking is performed in the above manner, there are often technical problems as follows:
the watermark is added by inserting the picture at the header, and the picture is easily found due to the visible watermark, so that the watermark is easily removed.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Some embodiments of the present disclosure propose a digital watermark adding method, a digital watermark extracting method, an apparatus, an electronic device, and a computer-readable medium to solve one or more of the technical problems mentioned in the above background section.
In a first aspect, some embodiments of the present disclosure provide a digital watermarking method for a spreadsheet, the method comprising: encrypting the watermark information to be added to obtain encrypted watermark information; carrying out sectional coding on the encrypted watermark information to obtain at least one piece of coded watermark information; generating the position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set; and adding the at least one piece of encoding watermark information into the at least one cell according to the position information set.
Optionally, the performing the segment encoding on the encrypted watermark information to obtain at least one piece of encoded watermark information includes: carrying out segmentation processing on the encrypted watermark information to obtain at least one piece of segmented watermark information; and coding each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information.
Optionally, the encoding each piece of watermark information in the at least one piece of watermark information to obtain at least one piece of encoded watermark information includes: determining the quotient of the quantity of the segmented watermark information included in the at least one piece of segmented watermark information and the target coding value; determining the integer part of the quotient as the encoding digit; and inserting codes into each piece of section watermark information in the at least one piece of section watermark information to obtain at least one piece of code watermark information, wherein the number of inserted codes is equal to the number of coded bits.
Optionally, the generating, according to the target watermark strength, the location information of each cell in the at least one cell to which information is to be added in the electronic form to obtain a location information set includes: acquiring the strength of a target watermark input by a user; determining a product of the target watermark strength and a segment value as a cell number, wherein the segment value is the number of segment watermark information included in the at least one segment watermark information; and generating the position information of each cell in at least one cell to which information is to be added in the electronic form to obtain a position information set, wherein the number of the cells included in the at least one cell is equal to the number of the cells.
Optionally, the adding the at least one encoded watermark information to the at least one cell according to the location information set includes: in response to that the target watermark strength is a target strength value, sequentially inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell; and in response to the target watermark strength being greater than the target strength value, inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell in a loop.
Optionally, the adding the at least one encoded watermark information to the at least one cell according to the location information set includes: and setting the font name corresponding to the at least one unit cell as the at least one encoding watermark information according to the position information set.
In a second aspect, some embodiments of the present disclosure provide a digital watermark extraction method for a spreadsheet, the method comprising: decompressing a target electronic form to obtain a decompressed file, wherein the target electronic form comprises at least one cell added with encoding watermark information; extracting at least one piece of encoding watermark information in the decompressed file, wherein each piece of encoding watermark information comprises encoding and sectional watermark information; splicing the segmented watermark information in each piece of encoded watermark information according to the encoding of the encoded watermark information included in the at least one piece of encoded watermark information to obtain encrypted watermark information; and decrypting the obtained encrypted watermark information to obtain the watermark information.
Optionally, after the decrypting the encrypted watermark information to obtain the watermark information, the method further includes: and displaying the watermark information.
In a third aspect, some embodiments of the present disclosure provide a digital watermarking apparatus for a spreadsheet, the apparatus comprising: the encryption unit is configured to encrypt the information to be added with the watermark to obtain encrypted watermark information; the sectional coding unit is configured to perform sectional coding on the encrypted watermark information to obtain at least one piece of coded watermark information; the generating unit is configured to generate the position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set; an adding unit configured to add the at least one encoded watermark information to the at least one cell according to the set of location information.
Optionally, the segment encoding unit is further configured to: carrying out segmentation processing on the encrypted watermark information to obtain at least one piece of segmented watermark information; and coding each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information.
Optionally, the segment encoding unit is further configured to: determining the quotient of the quantity of the segmented watermark information and the target coding value, wherein the segmented watermark information comprises the at least one piece of segmented watermark information; determining the integer part of the quotient as the encoding digit; and inserting codes into each piece of section watermark information in the at least one piece of section watermark information to obtain at least one piece of code watermark information, wherein the number of inserted codes is equal to the number of coded bits.
Optionally, the generating unit is further configured to: acquiring the strength of a target watermark input by a user; determining the number of the cells according to the target watermark strength and a segment value, wherein the segment value is the number of the segment watermark information included in the at least one segment watermark information; and generating the position information of each cell in at least one cell to which information is to be added in the electronic form to obtain a position information set, wherein the number of the cells included in the at least one cell is equal to the number of the cells.
Optionally, the adding unit is further configured to: in response to that the target watermark strength is a target strength value, sequentially inserting the encoding watermark information included in the at least one encoding watermark information into the at least one cell; and in response to the target watermark strength being greater than the target strength value, inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell in a loop.
Optionally, the adding unit is further configured to: and setting the font name corresponding to the at least one cell as the at least one piece of encoding watermark information according to the position information set.
In a fourth aspect, some embodiments of the present disclosure provide a digital watermark extraction apparatus for a spreadsheet, the apparatus comprising: the decompression unit is configured to decompress a target electronic form to obtain a decompressed file, wherein the target electronic form comprises at least one cell added with coding watermark information; an extracting unit configured to extract at least one piece of encoding watermark information in the decompressed file, each piece of encoding watermark information including encoding and segment watermark information; the splicing unit is configured to splice the segmented watermark information in each piece of encoded watermark information according to the encoding of the encoded watermark information included in the at least one piece of encoded watermark information to obtain encrypted watermark information; and the decryption unit is configured to decrypt the encrypted watermark information to obtain the watermark information.
Optionally, the apparatus further comprises: a display unit. Wherein the display unit is configured to display the watermark information.
In a fifth aspect, some embodiments of the present disclosure provide an electronic device, comprising: one or more processors; a storage device, on which one or more programs are stored, which when executed by one or more processors cause the one or more processors to implement the method described in any implementation of the first aspect.
In a sixth aspect, some embodiments of the present disclosure provide a computer readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method described in any of the implementations of the first aspect.
The above embodiments of the present disclosure have the following advantages: the digital watermarking method for the electronic form of some embodiments of the present disclosure improves the concealment of the watermark, so that the watermark is not easily removed. In particular, the reason why the related additional watermarking method easily causes the watermark to be removed is that: the watermark is added by inserting the picture at the header, and the picture is easy to find because the picture is a visible watermark. Based on this, in the digital watermark adding method for the electronic form according to some embodiments of the present disclosure, first, the watermark information to be added is encrypted to obtain encrypted watermark information. Therefore, the security of the document is improved by encrypting the information to be added with the watermark. And secondly, performing sectional encoding on the encrypted watermark information to obtain at least one piece of encoded watermark information. Therefore, by encoding the watermark, the watermark is convenient to extract. And then, generating the position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set. Thus, the number of cells to be watermarked can be determined by the watermark strength. Finally, the at least one encoding watermark information is added to the at least one cell according to the position information set. Thereby, it is achieved that a watermark is added in the at least one cell. Because the watermark added to the spreadsheet is a digital watermark and the at least one encoded watermark information is added to the at least one cell. Therefore, by the digital watermark adding method for the electronic form, the watermark concealment is improved, and the watermark is not easy to remove. In the process, the position of the cell to be added with the watermark information is determined according to the watermark strength, so that the flexible setting of the watermark strength is realized.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and elements are not necessarily drawn to scale.
FIG. 1 is a schematic illustration of one application scenario of some embodiments of the disclosed digital watermarking method for spreadsheets;
FIG. 2 is a flow diagram of some embodiments of a digital watermarking method for spreadsheets in accordance with the present disclosure;
FIG. 3 is a schematic illustration of one application scenario of some embodiments of the digital watermark extraction method for spreadsheets of the present disclosure;
FIG. 4 is a flow diagram of some embodiments of a digital watermark extraction method for a spreadsheet according to the present disclosure;
FIG. 5 is a block diagram of some embodiments of a digital watermarking apparatus for spreadsheets in accordance with the present disclosure;
FIG. 6 is a block diagram of some embodiments of a digital watermark extraction apparatus for a spreadsheet according to the present disclosure;
FIG. 7 is a schematic structural diagram of an electronic device suitable for use in implementing some embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings. The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
The names of messages or information exchanged between devices in the embodiments of the present disclosure are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a schematic diagram of one application scenario of some embodiments of the disclosed digital watermarking method for spreadsheets.
In the application scenario of fig. 1, first, the computing device 101 may perform encryption processing on the to-be-watermarked information 102 to obtain encrypted watermark information 103. For example, the encrypted watermark information 103 may be: "a 3s5df5gg2hhjjkk3lr 7". Then, the encrypted watermark information 103 is encoded in segments to obtain at least one encoded watermark information 104. For example, the at least one encoded watermark information 104 may include "0 a3s5, 1df5g, 2g2hh, 3jjkk, 43lr 7". Then, according to the target watermark strength 105, the position information of each cell in at least one cell to which information is to be added in the electronic form is generated, and a position information set 106 is obtained. For example, the set of location information 106 may include: "a 06, B12, B31, C09, D15". Finally, the at least one encoded watermark information 104 is added to the at least one cell according to the set of location information 106.
The computing device 101 may be hardware or software. When the computing device is hardware, it may be implemented as a distributed cluster composed of multiple servers or terminal devices, or may be implemented as a single server or a single terminal device. When the computing device is embodied as software, it may be installed in the hardware devices enumerated above. It may be implemented, for example, as multiple software or software modules to provide distributed services, or as a single software or software module. And is not particularly limited herein.
It should be understood that the number of computing devices in FIG. 1 is merely illustrative. There may be any number of computing devices, as implementation needs dictate.
With continued reference to fig. 2, a flow 200 of some embodiments of a digital watermarking method for spreadsheets in accordance with the present disclosure is shown. The digital watermarking method for the electronic form comprises the following steps:
In some embodiments, an executing body (e.g., the computing device shown in fig. 1) of the digital watermarking method for the electronic form may perform an encryption process on the information to be watermarked by an encryption algorithm, so as to obtain encrypted watermark information. Here, the specific type of encryption algorithm is not limited. The encryption algorithm may be a symmetric encryption algorithm, and the encryption algorithm may also be an asymmetric encryption algorithm. As an example, the Encryption algorithm may be an AES (Advanced Encryption Standard) algorithm. The watermark information to be added can be watermark information to be added into an electronic table. For example, the information to be added with watermark may be a character string. The watermark information to be added may also be an image. The information to be added may be information input by a user. The information to be added may also be information generated by the execution subject.
In some embodiments, the execution main body may perform segment encoding on the encrypted watermark information to obtain at least one encoded watermark information. In practice, the execution body may perform encoding processing on the encrypted watermark information, and perform segmentation on the basis of the encoding processing to obtain at least one piece of encoded watermark information. As an example, the execution body may insert a plurality of preset codes into the encrypted watermark information, respectively. For example, the above encrypted watermark information may be "a 3s5df5gg2 hhjkk 3lr 7". The execution body may sequentially insert codes "0, 1, 2, 3, 4" into the encrypted watermark information. In practice, the insertion position of the code can be flexibly determined according to the requirement. For example, the above codes can be inserted on average, resulting in "0 a3s51df5g2g2hh3jjkk43lr 7". On the basis of the above, the segmentation is carried out by taking the inserted codes as boundaries, and at least one piece of encoding watermark information, namely '0 a3s5, 1df5g, 2g2hh, 3jjkk and 43lr 7', is obtained.
In some optional implementations of some embodiments, the executing body may obtain the at least one piece of encoded watermark information by performing the following steps to perform segmented encoding on the encrypted watermark information.
The first step, the encrypted watermark information is processed in a segmented mode to obtain at least one piece of segmented watermark information. As an example, the execution subject may perform an average segmentation process on the encrypted watermark information to obtain at least one piece of watermark information. For example, the encrypted watermark information "a 3s5df5gg2 hhjkk 3lr 7" is divided into five segments, resulting in five pieces of watermark information "a 3s5, df5g, g2hh, jjjkk, 3lr 7".
And secondly, coding each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information. As an example, the execution body may sequentially concatenate at least one code with the at least one piece of watermark information to obtain at least one piece of encoded watermark information. For example, the execution body may splice the codes "0, 1, 2, 3, 4" with five pieces of watermark information "a 3s5, df5g, g2hh, jjjkk, 3lr 7" in turn. Five pieces of encoded watermark information "0 a3s5, 1df5g, 2g2hh, 3jjkk, 43lr 7" are obtained.
Thus, the watermark is randomly inserted by means of watermark segmentation and adding segment codes, and generally speaking, because a plurality of codes have a certain sequence, the sequence between at least one piece of coded watermark information can be identified. Therefore, after common operations such as sorting and screening are carried out, the texts before sorting and screening can still be restored through the encoding of the watermark.
Optionally, the executing entity may obtain the at least one piece of encoded watermark information by performing the following steps to encode each piece of watermark information in the at least one piece of watermark information.
Firstly, determining the number of encoding bits according to the at least one piece of sectional watermark information. In practice, the execution main body may determine the number of encoding bits according to the number of the segment watermark information included in the at least one segment watermark information and a target encoding value. The target encoding value may be a preset number of encodings. As an example, when the preset codes include "0 to 9" and "a to Z", the number of the preset codes may be 36, and the target code value may be 36. The executing entity may first determine a relationship between the number of the segment watermark information included in the at least one segment watermark information and a target encoding value, and in response to that the number of the segment watermark information included in the at least one segment watermark information is less than or equal to 36, the encoding bit number may be 1. For example, when the number of encoding bits is 1, the encoding may be 1 or a. The at least one piece of section watermark information is responded to, and the number of the piece of section watermark information is larger than the power N of 36 and smaller than the power N +1 of 36, wherein N is an integer larger than 0. The number of encoding bits may be N + 1. For example, when the number of encoding bits is 2, the encoding may be 01 or 0A.
And secondly, inserting codes into each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information, wherein the number of inserted codes is equal to the number of coded bits.
In some embodiments, the execution subject may generate location information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength, so as to obtain a location information set. The target watermark strength may be indicative of the strength of the inserted watermark. The target watermark strength may be a preset watermark strength. The target watermark strength may be a watermark strength input by a user. The location information may be information representing the location of the cell. For example, the position information may be row and column information of the cells. The position information may be coordinate information of the cell. In practice, the execution subject may randomly generate the location information of each cell in the at least one cell to which information is to be added in the electronic form according to the target watermark strength. As an example, when the number of the target watermark strength characterization watermarks is 5, the executing entity may randomly generate row and column information of 5 cells in the electronic table, so as to obtain a row and column information set. For example, the row and column information set may be "a 06, B12, B31, C09, D15". Where "A, B, C, D" characterizes the number of columns of the cell. "06, 12, 31, 09, 15" characterizes the number of rows of the cell.
In some optional implementations of some embodiments, the executing subject may generate, according to the target watermark strength, location information of each cell in at least one cell to which information is to be added in the electronic form, by performing the following steps, to obtain a location information set.
Firstly, acquiring the target watermark intensity input by a user.
And secondly, determining the number of the cells according to the target watermark strength and the segmentation value. The segment value may be the number of segment watermark information included in the at least one segment watermark information. As an example, the target watermark strength of the user input may be 1. The execution body may determine a product of the target watermark strength and the segment value as a cell number. For example, when the at least one piece of section watermark information includes 5 pieces of section watermark information, the section value is 5. The number of cells may be 5. As another example, the execution body may determine the power of the target watermark strength of the segment value as the number of cells.
And thirdly, generating the position information of each cell in at least one cell to which information is to be added in the electronic form to obtain a position information set, wherein the number of the cells included in the at least one cell is equal to the number of the cells. As an example, the number of the cells may be 5. The execution body may generate the location information of each of the 5 cells to be added with information in the spreadsheet, resulting in 5 location information.
Therefore, the number of the corresponding unit grids added with the watermarks is determined through the watermark strength parameters input by the user, and the density of the watermarks added to the document can be customized by the user.
And step 204, adding at least one piece of encoding watermark information into at least one cell according to the position information set.
In some embodiments, the execution subject may add the at least one encoded watermark information to the at least one cell according to the set of location information.
As an example, the execution body may modify the content in the at least one cell according to the at least one encoding watermark information. For example, the above-described encoding watermark information is added after the content in the cell.
In practice, the execution body may add the at least one piece of encoded watermark information to a cell corresponding to the position information set. As an example, the above-mentioned set of location information may include "a 06, B12, B31, C09, D15". The at least one encoded watermark information may include "0 a3s5, 1df5g, 2g2hh, 3jjkk, 43lr 7". The execution body may set the background-color theme names corresponding to the cells "a 06, B12, B31, C09, and D15" as the at least one piece of encoded information, respectively. For example, the execution body described above may set the background-color theme name of the cell corresponding to column a06 and row to "0 a3s 5".
In some optional implementations of some embodiments, the executing body may add the at least one encoded watermark information to the at least one cell according to the set of location information by performing the following steps.
And a first step of responding to that the target watermark strength is a target strength value, and sequentially inserting the encoding watermark information included in the at least one encoding watermark information into the at least one cell.
The target intensity value may represent a ratio of the number of encoded watermark information to the number of cells of 1. For example, the target intensity value may be 1. The target intensity value may be a. The target intensity value may be preset.
And a second step of inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell in a circulating manner in response to the target watermark strength being greater than the target strength value. As an example, when the above-described target watermark strength is twice the target strength value, the number of cells is twice the number of encoded watermark information. The execution body may insert the at least one encoded watermark information into the at least one cell twice in a loop. I.e. two different cells are inserted per encoded watermark information.
In some optional implementations of some embodiments, the execution subject may set a font name corresponding to the at least one cell as the at least one encoding watermark information according to the location information set.
As an example, the above-mentioned set of location information may be "a 06, B12, B31, C09, D15". The executing entity may set a font name corresponding to at least one cell corresponding to the location information set as the at least one encoding watermark information. For example, the font name corresponding to the cell positioned in row 06 of column a is updated from the original "regular font" to "0 a3s 5".
Therefore, the content of the spreadsheet is not modified by adding the watermark to the font name corresponding to the cell. It is to be understood that the execution body described above may set attribute values of various attributes of the cells as the encoded watermark information, according to implementation needs. Since the content of the cells is not modified, the influence on the accuracy of the data can be avoided. In addition, compared with the modes of adding invisible characters in a table or inserting hidden information in a file header and the like, the implementation modes can avoid losing watermark information in the file transmission or storage process, and have strong stability and attack resistance.
The above embodiments of the present disclosure have the following advantages: the digital watermarking method for the electronic form of some embodiments of the present disclosure improves the concealment of the watermark, so that the watermark is not easily removed. In particular, the reason why the related additional watermarking method easily causes the watermark to be removed is that: the watermark is added by inserting the picture at the header, and the picture is easy to find because the picture is a visible watermark. Based on this, in the digital watermark adding method for the electronic form according to some embodiments of the present disclosure, first, the watermark information to be added is encrypted to obtain encrypted watermark information. Therefore, the security of the document is improved by encrypting the information to be added with the watermark. And secondly, performing sectional encoding on the encrypted watermark information to obtain at least one piece of encoded watermark information. Therefore, the watermark is convenient to extract by encoding the watermark. And then, generating the position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set. Thus, the number of cells to be watermarked can be determined by the watermark strength. Finally, the at least one piece of coding watermark information is added to the at least one cell according to the position information set. Thereby, it is achieved that a watermark is added in the at least one cell. Because the watermark added to the spreadsheet is a digital watermark and the at least one encoded watermark information is added to the at least one cell. Therefore, by the digital watermark adding method for the electronic form, the watermark concealment is improved, and the watermark is not easy to remove. In the process, the position of the cell to be added with the watermark information is determined according to the watermark strength, so that the flexible setting of the watermark strength is realized.
Fig. 3 is a schematic diagram of one application scenario of some embodiments of the digital watermark extraction method for spreadsheets of the present disclosure.
In the application scenario of fig. 3, first, the computing device 301 may perform decompression processing on a target spreadsheet 302 to obtain a decompressed file 303, where the target spreadsheet 302 includes at least one cell to which the encoding watermark information has been added. Next, at least one piece of encoded watermark information 304 in the decompressed file 303 is extracted, each piece of encoded watermark information including encoding and segment watermark information. For example, the at least one encoded watermark information 304 may include "0 a3s5, 1df5g, 2g2hh, 3jjkk, 43lr 7". Then, according to the encoding of the encoding watermark information included in the at least one encoding watermark information 304, the segment watermark information in each encoding watermark information is spliced to obtain the encrypted watermark information 305. For example, the encrypted watermark information 305 may be: "a 3s5df5gg2 hhjkk 3lr 7". Finally, the encrypted watermark information 305 is decrypted to obtain watermark information 306.
The computing device 301 may be hardware or software. When the computing device is hardware, it may be implemented as a distributed cluster composed of multiple servers or terminal devices, or may be implemented as a single server or a single terminal device. When the computing device is embodied as software, it may be installed in the hardware devices enumerated above. It may be implemented, for example, as multiple software or software modules to provide distributed services, or as a single software or software module. And is not particularly limited herein.
It should be understood that the number of computing devices in FIG. 3 is merely illustrative. There may be any number of computing devices, as implementation needs dictate.
With continued reference to fig. 4, a flow 400 of some embodiments of a digital watermark extraction method for a spreadsheet according to the present disclosure is shown. The digital watermark extraction method for the electronic form comprises the following steps:
In some embodiments, the execution subject of the digital watermark extraction method for a spreadsheet (e.g., the computing device shown in fig. 3) may decompress the target spreadsheet resulting in a decompressed file. Wherein, the target electronic form may include at least one cell to which the encoding watermark information has been added. The target spreadsheet may be a spreadsheet that includes at least one cell to which encoded watermark information has been added. In practice, the executing agent may utilize some open-source text table decompression software to decompress the target electronic table, so as to obtain a file with an extension of styles.
In some embodiments, the execution body may extract at least one encoded watermark information in the decompressed file, wherein each encoded watermark information may include encoding and segment watermark information. In practice, the attribute value of a preset attribute (e.g., font name) of each cell may be extracted. And then, selecting an attribute value meeting a preset condition from the attribute values of each unit as encoding watermark information to obtain at least one encoding watermark information.
For example, the execution subject may first extract an element named "font name val" in the decompressed file, and obtain at least one piece of encoded watermark information after the filtering. Each of the at least one encoded watermark information may include encoding and segment watermark information. For example, the encoding watermark information "0 a3s 5" may include encoding "0" and the segment watermark information "a 3s 5".
In some embodiments, the execution main body may perform splicing processing on the segmented watermark information in each piece of encoded watermark information according to the encoding of the encoded watermark information included in the at least one piece of encoded watermark information, so as to obtain the encrypted watermark information. In practice, the execution main body may sequentially splice the segment watermark information in each piece of encoded watermark information according to the encoding sequence of the encoded watermark information included in the at least one piece of encoded watermark information, so as to obtain the encrypted watermark information. As an example, the above-mentioned at least one encoded watermark information may include "0 a3s5, 1df5g, 2g2hh, 3jjkk, 43lr 7". The order of encoding may be "0, 1, 2, 3, 4". The execution main body may splice the segmented watermark information in each piece of encoded watermark information according to the encoding sequence to obtain the encrypted watermark information "a 3s5df5gg2 hhjkk 3lr 7".
And step 404, decrypting the encrypted watermark information to obtain the watermark information.
In some embodiments, the execution main body may perform decryption processing on the encrypted watermark information to obtain watermark information. In practice, the executing entity decrypts by means of a key in an encryption algorithm. The encryption algorithm may be an encryption algorithm used when the watermark information to be added is encrypted.
Optionally, after the encrypted watermark information is decrypted to obtain the watermark information, the execution main body may display the watermark information.
The above embodiments of the present disclosure have the following advantages: by the digital watermark extraction method for the electronic form, the digital watermark in the electronic form can be extracted.
With further reference to fig. 5, as an implementation of the methods shown in the above figures, the present disclosure provides some embodiments of a digital watermarking apparatus for electronic forms, which correspond to those of the method embodiments shown in fig. 2, and which may be applied in various electronic devices in particular.
As shown in fig. 5, the digital watermarking apparatus 500 for a spreadsheet of some embodiments includes: an encryption unit 501, a segment encoding unit 502, a generation unit 503, and an addition unit 504. The encryption unit 501 is configured to encrypt the information to be added with the watermark to obtain encrypted watermark information; the segment encoding unit 502 is configured to perform segment encoding on the encrypted watermark information to obtain at least one encoded watermark information; the generating unit 503 is configured to generate the location information of each cell in the at least one cell to which information is to be added in the electronic form according to the target watermark strength, so as to obtain a location information set. The adding unit 504 is configured to add the at least one encoded watermark information to the at least one cell according to the set of location information.
In some optional implementations of some embodiments, the segment encoding unit 502 may be further configured to: carrying out segmentation processing on the encrypted watermark information to obtain at least one piece of segmented watermark information; and coding each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information.
In some optional implementations of some embodiments, the segment encoding unit 502 may be further configured to: determining the quotient of the quantity of the segmented watermark information included in the at least one piece of segmented watermark information and the target coding value; determining the integer part of the quotient as the encoding digit; and inserting codes into each piece of section watermark information in the at least one piece of section watermark information to obtain at least one piece of code watermark information, wherein the number of inserted codes is equal to the number of coded bits.
In some optional implementations of some embodiments, the generating unit 503 may be further configured to: acquiring the strength of a target watermark input by a user; determining the number of the cells according to the target watermark strength and a segment value, wherein the segment value is the number of the segment watermark information included in the at least one segment watermark information; and generating the position information of each cell in at least one cell to which information is to be added in the electronic form to obtain a position information set, wherein the number of the cells included in the at least one cell is equal to the number of the cells.
In some optional implementations of some embodiments, the adding unit 504 may be further configured to: in response to that the target watermark strength is a target strength value, sequentially inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell; and in response to the target watermark strength being greater than the target strength value, inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell in a loop.
In some optional implementations of some embodiments, the adding unit 504 may be further configured to: and setting the font name corresponding to the at least one unit cell as the at least one encoding watermark information according to the position information set.
It will be understood that the elements described in the apparatus 500 correspond to various steps in the method described with reference to fig. 2. Thus, the operations, features and resulting advantages described above with respect to the method are also applicable to the apparatus 500 and the units included therein, and are not described herein again.
With further reference to fig. 6, as an implementation of the methods shown in the above figures, the present disclosure provides some embodiments of a digital watermark extraction apparatus for electronic forms, which correspond to those of the method embodiments shown in fig. 4, and which may be applied in various electronic devices in particular.
As shown in fig. 6, the digital watermark extraction apparatus 600 for a spreadsheet according to some embodiments includes: a decompression unit 601, an extraction unit 602, a concatenation unit 603, and a decryption unit 604. The decompression unit 601 is configured to decompress a target spreadsheet to obtain a decompressed file, where the target spreadsheet comprises at least one cell to which encoding watermark information is added; the extracting unit 602 is configured to extract at least one encoded watermark information in the decompressed file, each encoded watermark information including encoding and segment watermark information; the splicing unit 603 is configured to splice the segment watermark information in each piece of encoded watermark information according to the encoding of the encoded watermark information included in the at least one piece of encoded watermark information, so as to obtain the encrypted watermark information. The decryption unit 604 is configured to perform decryption processing on the encrypted watermark information to obtain watermark information.
Optionally, the apparatus 600 may further include: a display unit (not shown). Wherein the display unit may be configured to display the watermark information.
It will be understood that the elements described in the apparatus 600 correspond to various steps in the method described with reference to fig. 4. Thus, the operations, features and resulting advantages described above with respect to the method are also applicable to the apparatus 600 and the units included therein, and are not described herein again.
Referring now to FIG. 7, shown is a schematic block diagram of an electronic device (such as computing device 101 shown in FIG. 1 or computing device 301 shown in FIG. 3) 700 suitable for use in implementing some embodiments of the present disclosure. The electronic device shown in fig. 7 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.
As shown in fig. 7, electronic device 700 may include a processing means (e.g., central processing unit, graphics processor, etc.) 701 that may perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM)702 or a program loaded from storage 708 into a Random Access Memory (RAM) 703. In the RAM703, various programs and data necessary for the operation of the electronic apparatus 700 are also stored. The processing device 701, the ROM702, and the RAM703 are connected to each other by a bus 704. An input/output (I/O) interface 705 is also connected to bus 704.
Generally, the following devices may be connected to the I/O interface 705: input devices 706 including, for example, a touch screen, touch pad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; an output device 707 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, and the like; storage 708 including, for example, magnetic tape, hard disk, etc.; and a communication device 709. The communication means 709 may allow the electronic device 700 to communicate wirelessly or by wire with other devices to exchange data. While fig. 7 illustrates an electronic device 700 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided. Each block shown in fig. 7 may represent one device or may represent multiple devices as desired.
In particular, according to some embodiments of the present disclosure, the processes described above with reference to the flow diagrams may be implemented as computer software programs. For example, some embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer-readable medium, the computer program comprising program code for performing the method illustrated by the flow chart. In some such embodiments, the computer program may be downloaded and installed from a network via communications means 709, or may be installed from storage 708, or may be installed from ROM 702. The computer program, when executed by the processing device 701, performs the above-described functions defined in the methods of some embodiments of the present disclosure.
It should be noted that the computer readable medium described in some embodiments of the present disclosure may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In some embodiments of the disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In some embodiments of the present disclosure, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (HyperText Transfer Protocol), and may interconnect with any form or medium of digital data communication (e.g., a communications network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.
The computer readable medium may be embodied in the electronic device; or may be separate and not incorporated into the electronic device. The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: and encrypting the watermark information to be added to obtain encrypted watermark information. And carrying out sectional encoding on the encrypted watermark information to obtain at least one piece of encoding watermark information. And generating the position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set. And adding the at least one piece of encoding watermark information into the at least one cell according to the position information set.
Computer program code for carrying out operations for embodiments of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in some embodiments of the present disclosure may be implemented by software, and may also be implemented by hardware. The described units may also be provided in a processor, and may be described as: a processor includes an encryption unit, a section encoding unit, a generation unit, and an addition unit. Here, the names of these units do not constitute a limitation to the unit itself in some cases, and for example, an encryption unit may also be described as a "unit that encrypts watermark information to be added".
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and the like.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept as defined above. For example, the above features and (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure are mutually replaced to form the technical solution.
Claims (12)
1. A digital watermarking method for spreadsheets, comprising:
encrypting the watermark information to be added to obtain encrypted watermark information;
carrying out sectional encoding on the encrypted watermark information to obtain at least one piece of encoded watermark information;
generating position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set;
adding the at least one encoded watermark information to the at least one cell according to the set of location information.
2. The method of claim 1, wherein the encoding the encrypted watermark information in segments to obtain at least one encoded watermark information comprises:
carrying out segmentation processing on the encrypted watermark information to obtain at least one piece of segmented watermark information;
and coding each piece of sectional watermark information in the at least one piece of sectional watermark information to obtain at least one piece of coded watermark information.
3. The method according to claim 2, wherein the encoding each of the at least one piece of watermark information to obtain at least one piece of encoded watermark information includes:
determining the number of encoding bits according to the at least one piece of sectional watermark information;
and inserting codes into each piece of section watermark information in the at least one piece of section watermark information to obtain at least one piece of code watermark information, wherein the number of inserted codes is equal to the number of coded bits.
4. The method of claim 2, wherein the generating location information of each of at least one cell to which information is to be added in the spreadsheet according to a target watermark strength to obtain a location information set comprises:
acquiring the strength of a target watermark input by a user;
determining the number of cells according to the target watermark strength and a segment value, wherein the segment value is the number of the segment watermark information included in the at least one segment watermark information;
and generating position information of each cell in at least one cell to which information is to be added in the electronic form to obtain a position information set, wherein the number of the cells included in the at least one cell is equal to the number of the cells.
5. The method of claim 4, wherein said adding the at least one encoded watermark information to the at least one cell according to the set of location information comprises:
in response to that the target watermark strength is a target strength value, sequentially inserting the encoding watermark information included in the at least one encoding watermark information into the at least one cell;
and in response to the target watermark strength being greater than the target strength value, inserting the encoded watermark information included in the at least one encoded watermark information into the at least one cell in a loop.
6. The method of claim 1, wherein said adding the at least one encoded watermark information to the at least one cell according to the set of location information comprises:
and setting the font name corresponding to the at least one unit cell as the at least one encoding watermark information according to the position information set.
7. A method of digital watermark extraction for a spreadsheet, the method comprising:
decompressing a target electronic form to obtain a decompressed file, wherein the target electronic form comprises at least one cell added with encoding watermark information;
extracting at least one piece of encoding watermark information in the decompressed file, wherein each piece of encoding watermark information comprises encoding and sectional watermark information;
splicing the segmented watermark information in each piece of encoding watermark information according to the encoding of the encoding watermark information included in the at least one piece of encoding watermark information to obtain encrypted watermark information;
and decrypting the encrypted watermark information to obtain the watermark information.
8. The method according to claim 7, wherein after said decrypting the encrypted watermark information to obtain watermark information, further comprising:
and displaying the watermark information.
9. A digital watermarking apparatus for electronic forms, comprising:
the encryption unit is configured to encrypt the information to be added with the watermark to obtain encrypted watermark information;
the sectional coding unit is configured to perform sectional coding on the encrypted watermark information to obtain at least one piece of coded watermark information;
the generating unit is configured to generate position information of each cell in at least one cell to which information is to be added in the electronic form according to the target watermark strength to obtain a position information set;
an adding unit configured to add the at least one encoded watermark information to the at least one cell according to the set of location information.
10. A digital watermark extraction apparatus for a spreadsheet, comprising:
the decompression unit is configured to decompress a target electronic form to obtain a decompressed file, wherein the target electronic form comprises at least one cell added with coding watermark information;
an extraction unit configured to extract at least one encoded watermark information in the decompressed file, each encoded watermark information comprising encoding and segment watermark information;
the splicing unit is configured to splice the segmented watermark information in each piece of encoded watermark information according to the encoding of the encoded watermark information included in the at least one piece of encoded watermark information to obtain encrypted watermark information;
and the decryption unit is configured to decrypt the encrypted watermark information to obtain the watermark information.
11. An electronic device, comprising:
one or more processors;
a storage device having one or more programs stored thereon,
when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-6 or 7-8.
12. A computer-readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method of any one of claims 1 to 6 or 7 to 8.
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