WO2018098879A1

WO2018098879A1 - Method and device for encrypting digital watermark

Info

Publication number: WO2018098879A1
Application number: PCT/CN2016/112858
Authority: WO
Inventors: 江亭
Original assignee: 深圳Tcl数字技术有限公司
Priority date: 2016-11-30
Filing date: 2016-12-29
Publication date: 2018-06-07
Also published as: CN106780280B; CN106780280A

Abstract

A method for encrypting digital watermark, the method comprising the following steps: adding a preset identification character to a digital watermark, so as to perform identification processing on the digital watermark, the digital watermark being in a first numbering system format (S10); performing a second numbering system format transformation on the identification-processed digital watermark, to generate a first character string in a second numbering system format corresponding to the digital watermark (S20); and extracting, in sequence, each character in the first character string according to a preset order, and according to the extracted character each time, processing correspondingly, in sequence, a node in a to-be-encrypted file corresponding to the extracted character to generate an encrypted file corresponding to the to-be-encrypted file, the to-be-encrypted file comprising a plurality of nodes (S30). Further disclosed is a device for encrypting digital watermark, which improves the reliability of digital watermark encryption.

Description

Digital watermark encryption method and device

Technical field

The present invention relates to the field of digital watermarking technologies, and in particular, to a digital watermark encryption method and apparatus.

Background technique

Digital watermarking technology is a technology that embeds some identification information (ie, digital watermark) into a digital carrier (including multimedia, documents, software, etc.), and is often used to protect information security or information hiding, and thus is widely used. When digital watermark encryption is performed on a digital carrier, the digital watermark is generally embedded directly into the digital carrier, which occupies a certain storage space of the digital carrier, and when the available storage space of the digital carrier is insufficient, the embedded digital watermark affects the digital carrier. Normal use, therefore, the reliability of digital watermark encryption is not very high.

Summary of the invention

The main object of the present invention is to provide a digital watermark encryption method and apparatus, aiming at solving the technical problem that the reliability of the existing digital watermark encryption is not high.

To achieve the above object, the present invention provides a digital watermark encryption method, and the digital watermark encryption method includes the following steps:

Adding a digital watermark to a preset identifier character to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

Converting the digital watermark after the processing to a binary format conversion to generate a first character string in a binary format corresponding to the digital watermark;

Extracting each character in the first character string in a preset order, and performing corresponding processing on the node corresponding to the extracted character in the encrypted file according to the character extracted each time, to generate the to-be-encrypted An encrypted file corresponding to the file, where the file to be encrypted includes multiple nodes;

Extracting each node of the encrypted file in turn, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Performing a first-order format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Finding the identifier character included in the third string, and acquiring the digital watermark according to the identifier character.

Preferably, the step of searching for the identifier character included in the third character string and acquiring the digital watermark according to the identifier character comprises:

Finding the two identifier characters included in the third string;

Extracting character information between two of the identification characters, the character information being the digital watermark.

In addition, in order to achieve the above object, the present invention also provides a digital watermark encryption method, and the digital watermark encryption method includes the following steps:

Extracting each character in the first character string in a preset order, and performing corresponding processing on the node corresponding to the extracted character in the encrypted file according to the character extracted each time, to generate the to-be-encrypted An encrypted file corresponding to the file, wherein the file to be encrypted includes a plurality of nodes.

Preferably, the step of adding the digital watermark to the preset identification character comprises:

The identification character is added at a head position and a tail position of the digital watermark.

Preferably, when the binary format is a binary format, the characters in the first character string are sequentially extracted in a preset order, and the files are extracted and extracted according to the characters extracted each time. The steps of the node corresponding to the character performing the corresponding processing include:

Extracting each character in the first character string in a binary format in a preset order;

If the currently extracted character is a binary character 0, the node corresponding to the currently extracted character in the file to be encrypted is maintained unchanged;

If the currently extracted character is a binary character 1, a space character is added to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.

Preferably, after the step of performing the corresponding processing on the node corresponding to the extracted character in the file to be encrypted, and the step of generating the encrypted file corresponding to the file to be encrypted, the method further includes:

Finding the two identifier characters included in the third string;

In addition, in order to achieve the above object, the present invention further provides a digital watermark encrypting apparatus, where the digital watermark encrypting apparatus includes:

An identifier module, configured to add a digital watermark to a preset identifier character, to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

a conversion module, configured to perform the second binary format conversion on the digital watermark after the identifier processing, to generate a first character string in a binary format corresponding to the digital watermark;

a processing module, configured to sequentially extract each character in the first character string according to a preset order, and perform corresponding processing on the node corresponding to the extracted character in the encrypted file according to each extracted character. And generating an encrypted file corresponding to the file to be encrypted, where the file to be encrypted includes multiple nodes.

Preferably, the identification module is used to:

Preferably, when the binary format is a binary format, the processing module includes:

An extracting unit, configured to sequentially extract each character in the first character string in a binary format according to a preset order;

a processing unit, configured to: if the currently extracted character is a binary character 0, maintaining a node corresponding to the currently extracted character in the file to be encrypted is unchanged; if the currently extracted character is a binary character 1, And adding a space character to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.

Preferably, the processing module is further configured to sequentially extract each node of the encrypted file, and determine a character in a binary format corresponding to each extracted node, and form the determined character into a second character in a binary format. string;

The conversion module is further configured to perform a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third string includes the identifier character digital water mark;

The digital watermark encryption device further includes:

And an obtaining module, configured to search for the identifier character included in the third string, and obtain the digital watermark according to the identifier character.

Preferably, the obtaining module comprises:

a searching unit, configured to search for the two identifier characters included in the third string;

And an obtaining unit, configured to extract character information between the two identifier characters, where the character information is the digital watermark.

The digital watermark encryption method and device proposed by the invention, when digital watermark encryption is to be performed on the encrypted file, firstly adds a digital watermark in the first binary format to the preset identification character, and then performs a binary format conversion on the digital watermark to generate The first character string in the binary format corresponding to the digital watermark, and then each character in the first character string is sequentially extracted according to a preset order, and the characters corresponding to the extracted characters are sequentially processed according to the characters extracted each time. The node performs corresponding processing, and the encrypted file corresponding to the file to be encrypted is generated after the processing is completed. Therefore, the encryption process only processes the node to be encrypted, and does not directly embed the digital watermark into the file to be encrypted, thereby avoiding embedding. The digital watermark occupies the storage space and affects the use of the file to be encrypted, thereby improving the reliability of the digital watermark encryption.

DRAWINGS

1 is a schematic flow chart of a first embodiment of a digital watermark encryption method according to the present invention;

2 is a schematic flow chart of a second embodiment of a digital watermark encryption method according to the present invention;

3 is a schematic diagram of functional modules of a first embodiment of a digital watermark encryption apparatus according to the present invention;

4 is a schematic diagram of a refinement function module of a processing module in a first embodiment of a digital watermark encryption apparatus according to the present invention;

FIG. 5 is a schematic diagram of functional modules of a second embodiment of a digital watermark encryption apparatus according to the present invention; FIG.

FIG. 6 is a schematic diagram of a refinement function module of an acquisition module in a second embodiment of the digital watermark encryption apparatus of the present invention.

The object, features, and advantages of the invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention provides a digital watermark encryption method. Referring to FIG. 1, FIG. 1 is a schematic flowchart of a first embodiment of a digital watermark encryption method according to the present invention.

In this embodiment, the digital watermark encryption method comprises the following steps:

In step S10, the digital watermark is added with a preset identification character to perform identification processing on the digital watermark, wherein the digital watermark is in a first binary format;

The digital watermarking technology embeds some identification information (ie, digital watermark) into a digital carrier (including multimedia, documents, software, etc.) or indirectly (modifies the structure of a specific area) without affecting the use value of the original carrier, and is not easy. Techniques that are detected and modified again, but can be identified and identified by the producer, are often used to protect information security or information hiding. In this embodiment, the encrypted file is encrypted by using a digital watermark, wherein the file to be encrypted includes multimedia, a document, software, and the like.

First, the digital watermark is subjected to identification processing, and the digital watermark is added with a preset identification character. For example, the identifier character corresponding to the digital watermark is preset to be “#”. Those skilled in the art can understand that the identification character can also be set to other Characters are not limited here. The digital watermark is in a first-ary format, for example, the digital watermark is in a decimal format.

Optionally, the step S10 includes:

When the digital watermark is identified, a preset identification character is added to the head position and the tail position of the digital watermark. For example, a character "#" is added to the head position and the tail position of the digital watermark to perform the digital watermark. Identification processing.

Step S20, performing the second binary format conversion on the digital watermark after the identification process to generate a first character string in a binary format corresponding to the digital watermark;

After performing the identification processing on the digital watermark, the digital watermark after the identification process is converted into a binary format to generate a first character string in a binary format corresponding to the digital watermark. For example, if the binary format is a binary format, the processed digital watermark is converted into a binary format to generate a first character string in a binary format corresponding to the digital watermark, that is, a binary 01 character string is generated.

Step S30, sequentially extracting each character in the first character string according to a preset order, and sequentially performing corresponding processing on the node corresponding to the extracted character in the file to be encrypted according to each extracted character. And generating an encrypted file corresponding to the file to be encrypted, where the file to be encrypted includes multiple nodes.

In this embodiment, after the first character string in the binary format is generated, each character in the first character string is sequentially extracted in a preset order, for example, the first character string is sequentially extracted in order from a high order to a low order. For each character, it can be understood that each character of the first character string can also be sequentially extracted in order from low to high. Since the file to be encrypted includes a plurality of nodes, the nodes corresponding to the extracted characters in the encrypted file are sequentially processed according to the characters extracted each time. For example, according to the extracted first character, the first node in the encrypted file is processed correspondingly, and according to the extracted second character, the second node in the encrypted file is processed correspondingly, and according to this method, according to the extraction Each character of the encrypted file is processed correspondingly to the node corresponding to the character. After the corresponding processing is performed on the node corresponding to each character in the encrypted file according to each character in the first character string, the encryption processing of the file to be encrypted is completed, and the encrypted file corresponding to the file to be encrypted is generated.

Optionally, when the binary format is a binary format, the step S30 includes:

Step a, sequentially extracting each character in the first character string in a binary format according to a preset order;

In step b, if the currently extracted character is a binary character 0, the node corresponding to the currently extracted character in the file to be encrypted is maintained unchanged;

In step c, if the currently extracted character is a binary character 1, a space character is added to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.

When the binary format is a binary format, performing binary format conversion on the digital watermark processed by the identifier, generating a first character string in a binary format corresponding to the digital watermark, and then sequentially extracting the first character string in a binary format according to a preset order. Each character, that is, extracts binary characters 0 and binary characters 1. If the currently extracted character is a binary character 0, the node corresponding to the currently extracted character in the file to be encrypted is maintained unchanged; if the currently extracted character is a binary character 1, the file to be encrypted corresponds to the currently extracted character. Add a space character to the end of the node. According to this method, the node corresponding to the character in the encrypted file is processed correspondingly according to each character in the extracted first character string.

The digital watermark encryption method of the present invention will be described in detail below by taking the apk (AndroidPackage, Android installation package) file of the Android application as an example.

When the user needs to perform digital watermark encryption on the apk file of a certain Android application, the user first performs identification processing on the digital watermark, for example, adding the character "#" in the head position and the tail position of the digital watermark respectively. Then, the digital watermark with the identification character added is converted into a binary format, for example, a binary format conversion is performed on the digital watermark to which the identification character is added, and the first character string in the binary format, that is, the binary 01 string is generated.

Since the apk file is a zip archive, the apk file should be decompressed. The unpacked apk file includes the AndroidManifest.xml file, the META-INF directory file, the res directory file, the lib directory file, the assets directory file, and the classes. Dex file, resources.arsc file.

Among them, the AndroidManifest.xml file must be defined and included in each Android application, it describes the name, version, permissions, referenced library files and so on information of the Android application; the signature information is stored under the META-INF directory file. Used to ensure the integrity of the apk package and system security; res directory file to store resource files, layout files, etc., where drawable storage resource files, layout, xml storage layout files; subdirectory armeabi under the lib directory file is stored So file; assets directory file stores some configuration files; classes.dex file is the compiled source code file of Java source code; resources.arsc file is the compiled resource file, in most cases, most of the words and statements that need to be finished In this file, we must first look at this file when we are finished.

Since the xml file has a huge redundant space, it is convenient to embed information such as a digital watermark. Therefore, after decompressing the apk file, the xml file under the res directory file is obtained. The obtained xml file is a compiled binary file, that is, the xml file is in a binary format. Therefore, after obtaining the xml file, the xml file is first converted in decimal format to obtain the formatted decimal format. Xml file.

Thereafter, each character in the first character string is sequentially extracted in a preset order, that is, binary character 0 and binary character 1 are extracted. If the currently extracted character is a binary character 0, the item node corresponding to the currently extracted character in the decimal format xml file is maintained unchanged; if the currently extracted character is a binary character 1, the currently extracted character is in the decimal format xml file. Add a space character to the tail position of the item node corresponding to the character. According to this method, according to the extraction of each character in the first character string, the item node corresponding to each character in the decimal format xml file is processed correspondingly to generate an encrypted xml file.

For example, if the first character extracted is a binary character 1, a space character is added at the tail position of the first item node of the decimal format xml file; if the extracted second character is a binary character 0, the decimal is maintained. The second item node of the format xml file is unchanged. According to this method, the item nodes corresponding to each character in the decimal format xml file are processed correspondingly according to each character extracted.

After the encryption is completed, the encrypted xml file is converted into a binary format, and then the xml file converted by the binary format is compressed and packaged together with other AndroidManifest.xml files, META-INF directory files, resources.arsc files, etc. to generate encryption. After the apk file. Further, since some apk files need to be verified by the signature, after the encrypted apk file is generated, the encrypted apk file is signed.

In the solution provided by this embodiment, when digital watermark encryption is to be performed on the encrypted file, the digital watermark in the first binary format is first added with a preset identification character, and then the digital watermark is converted into a binary format to generate a digital watermark corresponding to the digital watermark. The first character string in the binary format, and then each character in the first character string is sequentially extracted according to a preset order, and according to the character extracted each time, the node corresponding to the extracted character in the encrypted file is sequentially executed. After the processing is completed, the encrypted file corresponding to the file to be encrypted is generated. Therefore, the encryption process only processes the node to be encrypted, and the digital watermark is not directly embedded in the file to be encrypted, thereby avoiding the storage due to the embedded digital watermark. Space affects the use of files to be encrypted, thereby improving the reliability of digital watermark encryption.

Further, as shown in FIG. 2, a second embodiment of the digital watermark encryption method of the present invention is proposed based on the first embodiment. In this embodiment, after the step S30, the method further includes:

Step S40, sequentially extracting each node of the encrypted file, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Step S50: performing a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Step S60: Search for the identifier character included in the third character string, and acquire the digital watermark according to the identifier character.

In this embodiment, when the digital watermark corresponding to the encrypted file generated in the first embodiment is to be extracted, each node of the encrypted file is first extracted in turn, because the node in the encrypted file is the first character according to the binary format. Each character in the string is processed accordingly, and therefore, based on the extracted node, the character in the binary format corresponding to the extracted node can be determined. After determining the characters in the binary format corresponding to each node extracted, the determined characters in the binary format are composed of the second character string in the binary format, and the second character string includes the second binary format. a string.

Then, the second character string in the binary format is converted into a first-order format to generate a third character string in the first-ary format. When performing the first-ary format conversion on the second character string, that is, performing the first-ary format conversion on the first character string in the second binary format, and the first character string is generated after the first-ary format conversion The digital watermark carrying the identification character, that is, the third character string contains the digital watermark carrying the identification character. The identification character is found from the third character string. When the identification character is found, the digital watermark is obtained according to the identification character.

Optionally, if the identifier character is added to the head watermark and the tail position of the digital watermark during the digital watermark encryption process, the generated third character string includes two identifier characters. At this time, the step S60 includes:

Step d, searching for two identifier characters included in the third string;

Step e: extract character information between two identifier characters, where the character information is the digital watermark.

After the third string is generated, the two identifier characters included in the third string are found, and then the character information between the two identifier characters is extracted, and the character information is the digital watermark for the file to be encrypted. The digital watermark used in encryption, that is, the digital watermark is extracted from the encrypted file.

The digital watermark encryption method in this embodiment will be described in detail below by taking the encrypted apk file as an example.

When the user wants to extract the digital watermark from the encrypted apk file, first decompress the encrypted apk file to obtain the xml file under the decompressed res directory file. Since the xml file is in binary format, the xml file is converted in decimal format to generate a formatted converted decimal format xml file. Then, the item node in the decimal format xml file is sequentially extracted, and the binary character corresponding to the item node is determined according to the extracted item node. For example, it is determined whether there is a space character in the tail position of each item node extracted. When there is a space character at the tail position of the item node, it is determined that the item node corresponds to the binary character 1; when the tail position of the item node has no space character, Make sure that the item node corresponds to the binary character 0. After determining the binary character corresponding to each item node, the determined character is composed into the second character string in the binary format.

Then, the second character string is converted into a decimal format to generate a third character string in decimal, and the third character character contains a digital watermark carrying the identification character. The identification character is found from the third character string, and the digital watermark is obtained according to the identification character. For example, if a logo character is added to the head position and the tail position of the digital watermark in the process of digital watermark encryption on the apk file, two identifier characters are found in the third string, and the two identifiers are extracted. The character information between the characters, which is the digital watermark used in the digital watermark encryption of the apk file, that is, the digital watermark is extracted from the encrypted apk file.

In the solution provided by this embodiment, when extracting the digital watermark corresponding to the encrypted file, firstly extract each node of the encrypted file, and determine the characters in the binary format corresponding to each extracted node, and form the determined characters. a second character string in a binary format, and then performing a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a number carrying the identifier character After the watermark is searched for from the third character string, the digital watermark is obtained according to the identifier character. Therefore, the solution of the embodiment not only realizes digital watermark encryption, but also implements digital watermark extraction of the encrypted file.

The invention provides a digital watermark encryption device.

Referring to FIG. 3, FIG. 3 is a schematic diagram of functional modules of a first embodiment of a digital watermark encryption apparatus according to the present invention.

It should be emphasized that, for those skilled in the art, the functional block diagram shown in FIG. 4 is merely an exemplary diagram of a preferred embodiment, and those skilled in the art will surround the functional modules of the digital watermark encrypting apparatus shown in FIG. The new functional modules can be easily supplemented; the names of the functional modules are custom names, which are only used to assist in understanding the various program functional blocks of the digital watermark encrypting device, and are not used to limit the technical solutions of the present invention. The core is the function that each functional module of the defined name has to achieve.

In this embodiment, the digital watermark encryption device includes:

The identifier module 10 is configured to add a digital watermark to the preset identifier character to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

First, the identification module 10 performs the identification processing on the digital watermark, and adds the digital watermark to the preset identification character. For example, the identification character corresponding to the digital watermark is set to “#” in advance, and those skilled in the art can understand that the identifier can also be set. Characters are other characters and are not limited here. The digital watermark is in a first-ary format, for example, the digital watermark is in a decimal format.

Optionally, the identifier module 10 is specifically configured to:

When the digital watermark is subjected to the identification processing, the identification module 10 adds a preset identification character to the head position and the tail position of the digital watermark. For example, the identification module 10 adds the character "#" to the head position and the tail position of the digital watermark respectively. To identify the digital watermark.

The conversion module 20 is configured to perform the second binary format conversion on the digital watermark after the identifier processing, to generate a first character string in a binary format corresponding to the digital watermark;

After the identification module 10 performs the identification processing on the digital watermark, the conversion module 20 performs the binary conversion on the digital watermark after the identification process to generate the first character string in the binary format corresponding to the digital watermark. For example, if the binary format is a binary format, the conversion module 20 converts the processed digital watermark into a binary format to generate a first character string in a binary format corresponding to the digital watermark, that is, generates a binary 01 character string.

The processing module 30 is configured to sequentially extract each bit in the first character string according to a preset order, and sequentially perform corresponding processing on the node corresponding to the extracted character in the encrypted file according to each extracted character. And generating an encrypted file corresponding to the file to be encrypted, where the file to be encrypted includes multiple nodes.

In this embodiment, after the first character string in the second binary format is generated, the processing module 30 sequentially extracts each bit character in the first character string according to a preset order, for example, sequentially extracting the first character from the highest order to the low order. For each character of a string, it can be understood that each character of the first character string can also be sequentially extracted in order from low to high. Since the file to be encrypted includes a plurality of nodes, the processing module 30 sequentially performs corresponding processing on the nodes corresponding to the extracted characters in the encrypted file according to the characters extracted each time. For example, the processing module 30 performs corresponding processing on the first node in the encrypted file according to the extracted first character, and performs corresponding processing on the second node in the encrypted file according to the extracted second character, and the processing module 30 According to this method, the nodes corresponding to the characters in the encrypted file are processed correspondingly according to each character extracted. After the corresponding processing is performed on the node corresponding to each character in the encrypted file according to each character in the first character string, the encryption processing of the file to be encrypted is completed, and the encrypted file corresponding to the file to be encrypted is generated.

Optionally, as shown in FIG. 4, when the binary format is a binary format, the processing module 30 includes:

The extracting unit 31 is configured to sequentially extract each bit in the first character string in a binary format according to a preset order;

The processing unit 32 is configured to: if the currently extracted character is a binary character 0, maintain the node corresponding to the currently extracted character in the file to be encrypted unchanged; if the currently extracted character is a binary character 1 And adding a space character to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.

When the binary format is a binary format, the conversion module 20 performs binary format conversion on the digital watermark after the identification process, generates a first character string in a binary format corresponding to the digital watermark, and then the extracting unit 31 sequentially extracts the binary format according to a preset order. Each character in the first string, that is, extracts binary character 0 and binary character 1. If the currently extracted character is a binary character 0, the processing unit 32 maintains the node corresponding to the currently extracted character in the file to be encrypted unchanged; if the currently extracted character is the binary character 1, the processing unit 32 is in the file to be encrypted. A space character is added to the tail position of the node corresponding to the currently extracted character. In this manner, the processing unit 32 sequentially processes the node corresponding to the character in the file to be encrypted according to each bit character in the extracted first character string.

In the solution provided by this embodiment, when digital watermark encryption is to be performed on the encrypted file, the identifier module 10 first adds the digital watermark in the first format to the preset identifier character, and then the conversion module 20 performs the binary format conversion on the digital watermark. And generating a first character string in a binary format corresponding to the digital watermark, and then the processing module 30 sequentially extracts each bit character in the first character string according to a preset order, and sequentially processes the encrypted file according to each extracted character. The node corresponding to the extracted character performs corresponding processing, and the encrypted file corresponding to the file to be encrypted is generated after the processing is completed. Therefore, the encryption process only processes the node to be encrypted, and does not directly embed the digital watermark into the file to be encrypted. The problem that the embedded digital watermark occupies the storage space and affects the use of the file to be encrypted is avoided, thereby improving the reliability of the digital watermark encryption.

Further, as shown in FIG. 5, a second embodiment of the digital watermark encryption apparatus of the present invention is proposed based on the first embodiment. In this embodiment, the processing module 30 is further configured to:

The conversion module 20 is further configured to:

The digital watermark encryption device further includes:

The obtaining module 40 is configured to search for the identifier character included in the third character string, and obtain the digital watermark according to the identifier character.

In this embodiment, when the digital watermark corresponding to the encrypted file generated in the first embodiment is to be extracted, the processing module 30 first extracts each node of the encrypted file, because the node in the encrypted file is according to the binary format. Each character in the first character string is processed accordingly, and therefore, based on the extracted node, the character in the binary format corresponding to the extracted node can be determined. After determining the characters in the binary format corresponding to each node extracted, the determined characters in the binary format are composed of the second character string in the binary format, and the second character string includes the second binary format. a string.

Then, the conversion module 20 performs a first-ary format conversion on the second character string in the binary format to generate a third character string in the first-ary format. When performing the first-ary format conversion on the second character string, that is, performing the first-ary format conversion on the first character string in the second binary format, and the first character string is generated after the first-ary format conversion The digital watermark carrying the identification character, that is, the third character string contains the digital watermark carrying the identification character. The obtaining module 40 searches for the identifier character from the third character string. When the identifier character is found, the digital watermark is obtained according to the identifier character.

Optionally, if the identification module 10 adds the identification character to the head position and the tail position of the digital watermark in the process of performing digital watermark encryption on the encrypted file, the generated third character string includes two identification characters. At this time, as shown in FIG. 6, the obtaining module 40 includes:

The searching unit 41 is configured to search for the two identifier characters included in the third character string;

The obtaining unit 42 is configured to extract character information between two identifier characters, where the character information is the digital watermark.

After the third string is generated, the search unit 41 searches for the two identifier characters included in the third character string, and then the obtaining unit 42 extracts the character information between the two identifier characters, and the character information is to be The digital watermark used by the encrypted file in the digital watermark encryption, that is, the digital watermark is extracted from the encrypted file.

In the solution provided by this embodiment, when extracting the digital watermark corresponding to the encrypted file, the processing module 30 first extracts each node of the encrypted file, and determines the character in the binary format corresponding to each extracted node, and determines The character is composed of the second character string in the binary format, and then the conversion module 20 performs the first-ary format conversion on the second character string to generate a third character string in the first binary format, and the third character string includes The digital watermark carrying the identifier character, the obtaining module 40 obtains the identifier character from the third character string, and obtains the digital watermark according to the identifier character. Therefore, the solution of the embodiment not only realizes the digital watermark encryption, but also implements the encryption. Digital watermark extraction of files.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A digital watermark encryption method, characterized in that the digital watermark encryption method comprises the steps of:

Adding a digital watermark to a preset identifier character to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

Converting the digital watermark after the processing to a binary format conversion to generate a first character string in a binary format corresponding to the digital watermark;

Extracting each character in the first character string in a preset order, and performing corresponding processing on the node corresponding to the extracted character in the encrypted file according to the character extracted each time, to generate the to-be-encrypted An encrypted file corresponding to the file, where the file to be encrypted includes multiple nodes;

Extracting each node of the encrypted file in turn, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Performing a first-order format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Finding the identifier character included in the third string, and acquiring the digital watermark according to the identifier character.
The digital watermark encryption method according to claim 1, wherein the step of searching for the identification character included in the third character string and acquiring the digital watermark according to the identification character comprises:

Finding the two identifier characters included in the third string;

Extracting character information between two of the identification characters, the character information being the digital watermark.
A digital watermark encryption method, characterized in that the digital watermark encryption method comprises the steps of:

Adding a digital watermark to a preset identifier character to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

Converting the digital watermark after the processing to a binary format conversion to generate a first character string in a binary format corresponding to the digital watermark;

Extracting each character in the first character string in a preset order, and performing corresponding processing on the node corresponding to the extracted character in the encrypted file according to the character extracted each time, to generate the to-be-encrypted An encrypted file corresponding to the file, wherein the file to be encrypted includes a plurality of nodes.
The digital watermark encryption method according to claim 3, wherein when the binary format is a binary format, the characters in the first character string are sequentially extracted in a preset order, and according to Each time the extracted character is sequentially processed, the steps of performing the corresponding processing on the node corresponding to the extracted character in the encrypted file are:

Extracting each character in the first character string in a binary format in a preset order;

If the currently extracted character is a binary character 0, the node corresponding to the currently extracted character in the file to be encrypted is maintained unchanged;

If the currently extracted character is a binary character 1, a space character is added to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.
The digital watermark encryption method according to claim 4, wherein after the step of performing the corresponding processing on the node corresponding to the extracted character in the file to be encrypted, and generating the encrypted file corresponding to the file to be encrypted, Also includes:

Extracting each node of the encrypted file in turn, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Performing a first-order format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Finding the identifier character included in the third string, and acquiring the digital watermark according to the identifier character.
The digital watermark encryption method according to claim 3, wherein the step of adding the digital watermark to the preset identification character comprises:

The identification character is added at a head position and a tail position of the digital watermark.
The digital watermark encryption method according to claim 6, wherein the step of performing the corresponding processing on the node corresponding to the extracted character in the file to be encrypted, and generating the encrypted file corresponding to the file to be encrypted, Also includes:

Extracting each node of the encrypted file in turn, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Performing a first-order format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Finding the identifier character included in the third string, and acquiring the digital watermark according to the identifier character.
The digital watermark encryption method according to claim 6, wherein when the binary format is a binary format, the character in the first character string is sequentially extracted in a preset order, and according to Each time the extracted character is sequentially processed, the steps of performing the corresponding processing on the node corresponding to the extracted character in the encrypted file are:

Extracting each character in the first character string in a binary format in a preset order;

If the currently extracted character is a binary character 0, the node corresponding to the currently extracted character in the file to be encrypted is maintained unchanged;

If the currently extracted character is a binary character 1, a space character is added to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.
The digital watermark encryption method according to claim 8, wherein the step of performing the corresponding processing on the node corresponding to the extracted character in the file to be encrypted, and generating the encrypted file corresponding to the file to be encrypted, Also includes:

Extracting each node of the encrypted file in turn, and determining a character in a binary format corresponding to each extracted node, and forming the determined character into a second character string in a binary format;

Performing a first-order format conversion on the second character string to generate a third character string in a first-ary format, where the third character string includes a digital watermark carrying the identifier character;

Finding the identifier character included in the third string, and acquiring the digital watermark according to the identifier character.
The digital watermark encryption method according to claim 9, wherein the step of searching for the identification character included in the third character string and acquiring the digital watermark according to the identification character comprises:

Finding the two identifier characters included in the third string;

Extracting character information between two of the identification characters, the character information being the digital watermark.
A digital watermark encryption device, characterized in that the digital watermark encryption device comprises:

An identifier module, configured to add a digital watermark to a preset identifier character, to perform identifier processing on the digital watermark, wherein the digital watermark is in a first binary format;

a conversion module, configured to perform the second binary format conversion on the digital watermark after the identifier processing, to generate a first character string in a binary format corresponding to the digital watermark;

a processing module, configured to sequentially extract each character in the first character string according to a preset order, and perform corresponding processing on the node corresponding to the extracted character in the encrypted file according to each extracted character. And generating an encrypted file corresponding to the file to be encrypted, where the file to be encrypted includes multiple nodes.
The digital watermark encryption apparatus according to claim 11, wherein when the binary format is a binary format, the processing module comprises:

An extracting unit, configured to sequentially extract each character in the first character string in a binary format according to a preset order;

a processing unit, configured to: if the currently extracted character is a binary character 0, maintaining a node corresponding to the currently extracted character in the file to be encrypted is unchanged; if the currently extracted character is a binary character 1, And adding a space character to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.
The digital watermark encrypting apparatus according to claim 12, wherein the processing module is further configured to sequentially extract each node of the encrypted file, and determine a character in a binary format corresponding to each extracted node. , the determined character is composed of the second string in the binary format;

The conversion module is further configured to perform a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third string includes the identifier character digital water mark;

The digital watermark encryption device further includes:

And an obtaining module, configured to search for the identifier character included in the third string, and obtain the digital watermark according to the identifier character.
The digital watermark encryption apparatus according to claim 11, wherein said identification module is configured to:

The identification character is added at a head position and a tail position of the digital watermark.
The digital watermark encrypting apparatus according to claim 14, wherein the processing module is further configured to sequentially extract each node of the encrypted file, and determine a character in a binary format corresponding to each extracted node. , the determined character is composed of the second string in the binary format;

The conversion module is further configured to perform a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third string includes the identifier character digital water mark;

The digital watermark encryption device further includes:

And an obtaining module, configured to search for the identifier character included in the third string, and obtain the digital watermark according to the identifier character.
The digital watermark encryption apparatus according to claim 14, wherein when the binary format is a binary format, the processing module comprises:

An extracting unit, configured to sequentially extract each character in the first character string in a binary format according to a preset order;

a processing unit, configured to: if the currently extracted character is a binary character 0, maintaining a node corresponding to the currently extracted character in the file to be encrypted is unchanged; if the currently extracted character is a binary character 1, And adding a space character to the tail position of the node corresponding to the currently extracted character in the file to be encrypted.
The digital watermark encrypting apparatus according to claim 16, wherein the processing module is further configured to sequentially extract each node of the encrypted file, and determine a character in a binary format corresponding to each extracted node. , the determined character is composed of the second string in the binary format;

The conversion module is further configured to perform a first-ary format conversion on the second character string to generate a third character string in a first-ary format, where the third string includes the identifier character digital water mark;

The digital watermark encryption device further includes:

And an obtaining module, configured to search for the identifier character included in the third string, and obtain the digital watermark according to the identifier character.
The digital watermark encrypting apparatus according to claim 17, wherein the obtaining module comprises:

a searching unit, configured to search for the two identifier characters included in the third string;

And an obtaining unit, configured to extract character information between the two identifier characters, where the character information is the digital watermark.