CN105989569A - Digital watermark embedding method and apparatus for EPUB document as well as extraction method and apparatus - Google Patents
Digital watermark embedding method and apparatus for EPUB document as well as extraction method and apparatus Download PDFInfo
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- CN105989569A CN105989569A CN201510101218.0A CN201510101218A CN105989569A CN 105989569 A CN105989569 A CN 105989569A CN 201510101218 A CN201510101218 A CN 201510101218A CN 105989569 A CN105989569 A CN 105989569A
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Abstract
Embodiments of the invention provide a digital watermark embedding method and apparatus for an EPUB document as well as an extraction method and apparatus. During embedding, a to-be-processed EPUB document is obtained; a preset key is embedded into an image to obtain a digital watermark file; the digital watermark file is encrypted to generate an encrypted character string; the encrypted character string is written in a permissive text file, and the permissive text file is embedded into the to-be-processed document to obtain a document embedded with the permissive text file. By encrypting the digital watermark file, writing the encrypted character string in the independent permissive text file and embedding the permissive text file into the to-be-processed document, instead of directly embedding the digital watermark file into the to-be-processed document, the problem of digital watermark information distortion does not exist, an especially long key can be embedded, and the security of the EPUB document is improved. During extraction, the permissive text file is decompressed and read from the EPUB file, and the text file is read and decrypted to obtain the digital watermark file; and decryption is carried out to obtain the embedded key.
Description
Technical field
The present embodiments relate to file process and identification technology, particularly relate to the numeral of a kind of EPUB document
Watermark embedding method and device and extracting method and device.
Background technology
Along with the arrival of informationized society, all start digitized as music, film, books periodical etc. and store
In a computer.But simultaneously because the characteristic that the virus-type of digital product is propagated so that pirate and content
Integrity issue is the most serious.Digital watermarking is the copyright protection of digital product technology occurred in recent years, can take
With copyright information and authentication information, the legal copies of protection digital product and propagation.
Digital watermark technology is born in the nineties in 20th century, mainly for solving data safety and copyright protection
Problem.The basic thought of digital watermarking is: on the premise of not changing content data file, by key,
Copyright protection information and authentication information etc. are embedded in the files such as image, document, video.Extracting numeral water
Verify legitimacy after print, identify bootlegging and the digital product usurped, as cryptographic encryption or
Supplementing of Chaotic Technology, the legal copies of protection digital product and propagation.
Although digital watermark technology has developed a lot of year, also occur in that more method, but use single
Digital Watermarking Embedded Algorithm, also exists various problem: as having embedding simply when algorithm, hidden capacity is big,
When there is the advantages such as good the most not sentience, the shortcoming that often there is the easy distortion of information, or, embed
Algorithm is safer, but the data volume embedded is less, sensitive to affine transformation.
Summary of the invention
The embodiment of the present invention provides the number of a kind of EPUB (Electronic Publication, electronic publishing) document
Word watermark embedding method and device, to keep pending EPUB document content constant and to improve EPUB document
Safety.
First aspect, embodiments provides the data waterprint embedded method of a kind of EPUB document, bag
Include:
Obtaining pending document, described pending document is EPUB (electronic publishing) document；
Preset-key is embedded in the image previously generated, obtains digital watermarking file；
Described digital watermarking file encryption is generated encrypted characters string；
By described encrypted characters string write license text, and treat described in the embedding of described license text
Process in document, obtain being embedded with the document of described license text.
Second aspect, embodiments provides the digital watermark embedding device of a kind of EPUB document, bag
Include:
Document acquisition module, is used for obtaining pending document, and described pending document is EPUB (electronic publishing)
Document；
Digital watermarking acquisition module, for being embedded in the image previously generated by preset-key, obtains numeral
Watermark file；
Digital watermarking encrypting module, for generating encrypted characters string to described digital watermarking file encryption；
Embed module, for text is permitted in the write of described encrypted characters string, and by described license text
File embeds in described pending document, obtains being embedded with the document of described license text.
The third aspect, embodiments provides the digital watermarking extracting method of a kind of EPUB document, bag
Include:
Obtaining pending document, described pending document uses the EPUB document of embodiment of the present invention offer
Data waterprint embedded method obtains；
From described pending document, extract license text, and read from described license text and add
Close character string；
Described encrypted characters string is decrypted, obtains digital watermarking file；
Key is extracted from described digital watermarking file.
Fourth aspect, embodiments provides the digital watermarking extraction element of a kind of EPUB document, bag
Include:
Document acquisition module, is used for obtaining pending document, and described pending document uses the embodiment of the present invention
The digital watermark embedding device of the EPUB document provided obtains；
Encrypted characters string extraction module, for extracting license text from described pending document, and from
Described license text reads encrypted characters string；
Digital watermarking extraction module, for being decrypted described encrypted characters string, obtains digital watermarking file；
Key extraction module, for extracting key from described digital watermarking file.
The data waterprint embedded method of the EPUB document that the embodiment of the present invention provides and device, by watermark
Image embeds preset-key, can improve the safety of the digital watermarking file being embedded with preset-key；Pass through
Numeral watermark file is encrypted, and the encrypted characters string generated is write in independent license text,
And independent license text is embedded in pending EPUB document rather than directly by digital watermarking
File is embedded in pending EPUB document, the problem that there is not digital watermark information distortion, and can
The key grown especially with embedded length, substantially increases the safety of EPUB document.
Accompanying drawing explanation
In order to be illustrated more clearly that the present invention, simple by the accompanying drawing used required in the present invention is done one below
Ground is introduced, it should be apparent that, the accompanying drawing in describing below is some embodiments of the present invention, for this area
From the point of view of those of ordinary skill, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Obtain other accompanying drawing.
The flow process of the data waterprint embedded method of a kind of EPUB document that Fig. 1 provides for the embodiment of the present invention one
Figure；
The structure of the digital watermark embedding device of a kind of EPUB document that Fig. 2 provides for the embodiment of the present invention two
Schematic diagram；
The flow process of the digital watermarking extracting method of a kind of EPUB document that Fig. 3 provides for the embodiment of the present invention three
Figure；
The structure of the digital watermarking extraction element of a kind of EPUB document that Fig. 4 provides for the embodiment of the present invention four
Schematic diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Technical scheme in embodiment is described in further detail, it is clear that described embodiment is the present invention one
Divide embodiment rather than whole embodiments.It is understood that specific embodiment described herein is only
For explaining the present invention, rather than limitation of the invention, based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under not making creative work premise, broadly falls into this
The scope of bright protection.It also should be noted that, for the ease of describing, accompanying drawing illustrate only and this
Bright relevant part rather than full content.
Embodiment one
Refer to Fig. 1, for the data waterprint embedded method of a kind of EPUB document that the embodiment of the present invention one provides
Flow chart.The method of the present embodiment can be by the number configuring the EPUB document realized with hardware and/or software
Word watermark embedding device performs, and this realizes device and is typically configured at and can provide EPUB document process
In the equipment of service.
The method includes: step 110～step 140.
Step 110, obtaining pending document, described pending document is EPUB document.
EPUB type is an open standard freely, and belonging to one can the content of " layout the most again "；
Namely word content can show in the way of being most suitable for reading according to the characteristic of arrangement for reading.EPUB class
It is alternative that type contains numerical digit copyright management (Digital Rights Management, DRM) correlation function.
EPUB is an open standard freely, and EPub file internal employs XHTML or DTBook
Represent word, and carry out wrapped file content with zip compressed format.Due to this characteristic of EPUB file,
Doing digital watermarking when, digital watermarking file can be embedded into EPUB literary composition as an independent file
In part rather than as other PDF, audio files must be embedded in file header.So not existing
The problem of watermark file information distortion, and the character key can grown especially with embedded length.So increasing
Add safety.
Step 120, preset-key is embedded in the image previously generated, obtains digital watermarking file.
In this step, the form of the image previously generated can be BMP form, JPG form, JPEG lattice
Any one in formula, GIF form and PNG format.
Described preset-key is the character string of preseting length, including the letter string of preseting length, in numeric string
Any one or a combination thereof.
Preferably, preset-key is embedded into the least significant bit of the pixel value of the image previously generated.We
Formula, has embedding and contains much information and the advantage such as good not sentience, can be embedded by longer key pre-
In the image first generated, thus improve the safety of the image being embedded with preset-key further.
Step 130, to described digital watermarking file encryption generate encrypted characters string.
It should be noted that by embedding preset-key in the picture, it is provided that the peace of digital watermarking file
Quan Xing；Data watermark file is encrypted, safety can be improved further.
Step 140, by described encrypted characters string write license text, and by embedding for described license text
Enter in described pending document, obtain being embedded with the document of described license text.
Wherein, license text is an independent file.
The technical scheme of the present embodiment, by watermarking images embed preset-key, can improve be embedded with pre-
If the safety of the digital watermarking file of key；By numeral watermark file is encrypted, and by generation
In the license text that the write of encrypted characters string is independent, and independent license text is embedded pending
EPUB document in rather than directly digital watermarking file is embedded in pending EPUB document,
The problem that there is not digital watermark information distortion, and the key can grown especially with embedded length, be greatly improved
The safety of EPUB document.
Further, after obtaining pending document, preset-key is being embedded into the image previously generated
Before in, described method may preferably further comprise:
Whether the described pending document that detection obtains can embed digital watermarking file；
The most then trigger and perform to be embedded in the image previously generated preset-key, obtain digital watermarking literary composition
The operation of part.
The manner, whether the pending EPUB document obtained by detection can embed digital watermarking file,
The safety of the described pending document of acquisition can be primarily determined that, when testing result is for embedding numeral water
Printed text part, namely in the case of the safety of pending document that obtains is low, trigger perform preset-key is embedding
Enter in the image previously generated, obtain the operation of digital watermarking file, it is possible to accurately detect pending literary composition
Shelves.
The technical scheme of the embodiment of the present invention, be applicable to 128K, 256K, 512K, 1M, 2M, 3M,
The data file of 4M, 6M different size of EPUB type embeds the digital watermarking of double-encryption, improves
The safety of pending EPUB document.
Embodiment two
Refer to Fig. 2, for the digital watermark embedding device of a kind of EPUB document that the embodiment of the present invention two provides
Structural representation.This device includes: document acquisition module 210, digital watermarking acquisition module 220, numeral
Watermark encrypting module 230 and embedding module 240.
Wherein, document acquisition module 210 is used for obtaining pending document, and described pending document is EPUB
(electronic publishing) document；Digital watermarking acquisition module 220 previously generates for being embedded into by preset-key
In image, obtain digital watermarking file；Digital watermarking encrypting module 230 is for described digital watermarking file
Encryption generates encrypted characters string；Embed module 240 and permit text for being write by described encrypted characters string,
And described license text is embedded in described pending document, obtain being embedded with described license text
Document.
The technical scheme of the present embodiment, by watermarking images embed preset-key, can improve be embedded with pre-
If the safety of the digital watermarking file of key；By numeral watermark file is encrypted, and by generation
In the license text that the write of encrypted characters string is independent, and independent license text is embedded pending
EPUB document in rather than directly digital watermarking file is embedded in pending EPUB document,
The problem that there is not digital watermark information distortion, and the key can grown especially with embedded length, be greatly improved
The safety of EPUB document.
In such scheme, described digital watermarking acquisition module 220 is particularly used in:
Preset-key is embedded into the least significant bit of the pixel value of the image previously generated.
In such scheme, described device may also include that
Detection module, for after obtaining pending document, will preset at described digital watermarking acquisition module
Before key is embedded in the image previously generated, whether the described pending document that detection obtains can embed
Digital watermarking file；
The most then trigger described digital watermarking acquisition module to perform preset-key is embedded into the figure previously generated
In Xiang, obtain the operation of digital watermarking file.
The digital watermark embedding device of the EPUB document that the embodiment of the present invention provides can perform the embodiment of the present invention
The data waterprint embedded method of the EPUB document provided, possesses the corresponding functional module of execution method and has
Benefit effect.
Embodiment three
The digital watermarking extracting method of the EPUB document that the embodiment of the present invention provides carries corresponding to above-described embodiment
The data waterprint embedded method of the EPUB document of confession, that is, both are based on same design.
Refer to Fig. 3, for the digital watermarking extracting method of a kind of EPUB document that the embodiment of the present invention three provides
Flow chart.The embodiment of the present invention provide EPUB document digital watermarking extracting method can by configure with
The digital watermarking extraction element of the EPUB document that hardware and/software realize performs, and it is typical that this realizes device
It is arranged in providing in the equipment of EPUB document processing services.
The method includes: step 310～step 340.
Step 310, obtain pending document.
Wherein, the digital watermarking of the EPUB document that the described pending document employing embodiment of the present invention provides is embedding
Enter method to obtain.
Step 320, from described pending document, extract license text, and from described license text
Middle reading encrypted characters string.
Wherein, license text is an independent file.
Step 330, described encrypted characters string is decrypted, obtains digital watermarking file.
Step 340, from described digital watermarking file extract key.
It should be noted that encrypted characters string is deciphered by step 330, it is possible to obtain digital watermarking literary composition
Part；According to previous embodiment one, digital watermarking file is to previously generate by being embedded into by preset-key
Image in obtain, can embed in the way of using least significant bit, therefore, this step is equivalent to
Numeral watermark file is decrypted, thus extracts the key being embedded in digital watermarking file.
In this step, can from the beginning of the least significant bit of the pixel value of the image of described digital watermarking file,
Perform to extract the operation of key from described digital watermarking file, until detecting that default end mark accords with.
First the technical scheme of the present embodiment, by extracting independent license from pending EPUB document
Text, and the encrypted characters string in license text is decrypted, it is possible to obtain digital watermarking literary composition
Part, is decrypted, such that it is able to extract the key being embedded in digital watermarking file numeral watermark file.
In such scheme, after extracting key from described digital watermarking file, described method also can be wrapped
Include:
Described key and described pending document are carried out the preset-key that digital watermark embedding used carry out right
Ratio, if described key is identical with described preset-key, it is determined that described pending document is legal, the most non-
Method.
This programme, is extracting, from pending EPUB document, the key being embedded in digital watermarking file
Afterwards, default close by what the key of extraction and described pending document were carried out that digital watermark embedding used
Key contrasts, and can identify the legitimacy of pending EPUB document.
In such scheme, after obtaining pending document, it is also possible to include, to the pending literary composition obtained
Shelves carry out pretreatment, it is judged that whether described pending document is the EPUB document that can carry out watermark extracting, institute
State and can carry out the EPUB document of watermark extracting and refer to meet and can carry out the Doctype of watermark extracting and for not
There is the document of damage.When described pending document is the EPUB document that can carry out watermark extracting, continue to hold
Other operations of row, otherwise end operation.
The technical scheme of the embodiment of the present invention, be applicable to from 128K, 256K, 512K, 1M, 2M, 3M,
4M, 6M different size of EPUB type, the pending document that is embedded with digital watermarking are extracted key,
And identify the legitimacy of pending document.
Embodiment four
Refer to Fig. 4, for the digital watermarking extraction element of a kind of EPUB document that the embodiment of the present invention four provides
Structural representation.This device includes: document acquisition module 410, encrypted characters string extraction module 420, number
Word watermark extracting module 430 and key extraction module 440.
Wherein, document acquisition module 410 is used for obtaining pending document, and described pending document uses this
The digital watermark embedding device of the EPUB document that bright embodiment provides obtains；Encrypted characters string extraction module 420
For extracting license text from described pending document, and read from described license text and add
Close character string；Digital watermarking extraction module 430, for being decrypted described encrypted characters string, obtains numeral
Watermark file；Key extraction module 440 is for extracting key from described digital watermarking file.
Further, described device may also include that
Double secret key is than module, for after extracting key from described digital watermarking file, by described key
Carry out, with described pending document, the preset-key that digital watermark embedding used to contrast, if described close
Key is identical with described preset-key, it is determined that described pending document is legal, the most illegally.
The digital watermarking extraction element of the EPUB document that the embodiment of the present invention provides can perform the embodiment of the present invention
The digital watermarking extracting method of the EPUB document provided, possesses the corresponding functional module of execution method and has
Benefit effect.
Last it is noted that various embodiments above is merely to illustrate technical scheme, rather than to it
Limit；In embodiment preferred embodiment, not it is limited, for people in the art
For Yuan, the present invention can have various change and change.All made within spirit and principles of the present invention
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (10)
1. the data waterprint embedded method of an EPUB document, it is characterised in that including:
Obtaining pending document, described pending document is EPUB electronic publishing document；
Preset-key is embedded in the image previously generated, obtains digital watermarking file；
Described digital watermarking file encryption is generated encrypted characters string；
By described encrypted characters string write license text, and treat described in the embedding of described license text
Process in document, obtain being embedded with the document of described license text.
Method the most according to claim 1, it is characterised in that preset-key is embedded into and previously generates
Image in, including:
Preset-key is embedded into the least significant bit of the pixel value of the image previously generated.
Method the most according to claim 1 and 2, it is characterised in that after obtaining pending document,
Before being embedded in the image previously generated by preset-key, described method also includes:
Whether the described pending document that detection obtains can embed digital watermarking file；
The most then trigger and perform to be embedded in the image previously generated preset-key, obtain digital watermarking literary composition
The operation of part.
4. the digital watermarking extracting method of an EPUB document, it is characterised in that including:
Obtaining pending document, described pending document uses the EPUB of offer as arbitrary in claim 1-3
The data waterprint embedded method of document obtains；
From described pending document, extract license text, and read from described license text and add
Close character string；
Described encrypted characters string is decrypted, obtains digital watermarking file；
Key is extracted from described digital watermarking file.
Method the most according to claim 4, it is characterised in that carrying from described digital watermarking file
After taking key, described method also includes:
Described key and described pending document are carried out the preset-key that digital watermark embedding used carry out right
Ratio, if described key is identical with described preset-key, it is determined that described pending document is legal, the most non-
Method.
6. the digital watermark embedding device of an EPUB document, it is characterised in that including:
Document acquisition module, is used for obtaining pending document, and described pending document is EPUB electronic publishing
Document；
Digital watermarking acquisition module, for being embedded in the image previously generated by preset-key, obtains numeral
Watermark file；
Digital watermarking encrypting module, for generating encrypted characters string to described digital watermarking file encryption；
Embed module, for text is permitted in the write of described encrypted characters string, and by described license text
File embeds in described pending document, obtains being embedded with the document of described license text.
Device the most according to claim 6, it is characterised in that described digital watermarking acquisition module is concrete
For:
Preset-key is embedded into the least significant bit of the pixel value of the image previously generated.
8. according to the device described in claim 6 or 7, it is characterised in that described device also includes:
Detection module, for after obtaining pending document, will preset at described digital watermarking acquisition module
Before key is embedded in the image previously generated, whether the described pending document that detection obtains can embed
Digital watermarking file；
The most then trigger described digital watermarking acquisition module to perform preset-key is embedded into the figure previously generated
In Xiang, obtain the operation of digital watermarking file.
9. the digital watermarking extraction element of an EPUB document, it is characterised in that including:
Document acquisition module, is used for obtaining pending document, and described pending document uses such as claim 6-8
The digital watermark embedding device of the EPUB document of arbitrary offer obtains；
Encrypted characters string extraction module, for extracting license text from described pending document, and from
Described license text reads encrypted characters string；
Digital watermarking extraction module, for being decrypted described encrypted characters string, obtains digital watermarking file；
Key extraction module, for extracting key from described digital watermarking file.
Device the most according to claim 9, it is characterised in that described device also includes:
Double secret key is than module, for after extracting key from described digital watermarking file, by described key
Carry out, with described pending document, the preset-key that digital watermark embedding used to contrast, if described close
Key is identical with described preset-key, it is determined that described pending document is legal, the most illegally.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510101218.0A CN105989569A (en) | 2015-03-06 | 2015-03-06 | Digital watermark embedding method and apparatus for EPUB document as well as extraction method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510101218.0A CN105989569A (en) | 2015-03-06 | 2015-03-06 | Digital watermark embedding method and apparatus for EPUB document as well as extraction method and apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108833099A (en) * | 2018-07-27 | 2018-11-16 | 深圳市新名泽科技有限公司 | Key generation method, device, key recovery method and device |
| CN109325323A (en) * | 2018-09-20 | 2019-02-12 | 中国农业银行股份有限公司 | The generation method of digital watermarking, the extracting method of confidential information and device |
| CN109800547A (en) * | 2019-01-09 | 2019-05-24 | 杭州基尔区块链科技有限公司 | A method of the information for WORD document protection and distribution tracking is quickly embedded in and extracts |
| US20210303716A1 (en) * | 2020-03-26 | 2021-09-30 | Bank Of America Corporation | Securing PIN Information Using Obfuscation by Applying Extra Security Layer |
-
2015
- 2015-03-06 CN CN201510101218.0A patent/CN105989569A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108833099A (en) * | 2018-07-27 | 2018-11-16 | 深圳市新名泽科技有限公司 | Key generation method, device, key recovery method and device |
| CN109325323A (en) * | 2018-09-20 | 2019-02-12 | 中国农业银行股份有限公司 | The generation method of digital watermarking, the extracting method of confidential information and device |
| CN109325323B (en) * | 2018-09-20 | 2020-12-15 | 中国农业银行股份有限公司 | Digital watermark generation method, and secret information extraction method and device |
| CN109800547A (en) * | 2019-01-09 | 2019-05-24 | 杭州基尔区块链科技有限公司 | A method of the information for WORD document protection and distribution tracking is quickly embedded in and extracts |
| CN109800547B (en) * | 2019-01-09 | 2023-04-07 | 杭州基尔区块链科技有限公司 | Method for quickly embedding and extracting information for WORD document protection and distribution tracking |
| US20210303716A1 (en) * | 2020-03-26 | 2021-09-30 | Bank Of America Corporation | Securing PIN Information Using Obfuscation by Applying Extra Security Layer |
| US11829499B2 (en) * | 2020-03-26 | 2023-11-28 | Bank Of America Corporation | Securing PIN information using obfuscation by applying extra security layer |
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