CN105787307B - A kind of text based digital watermarking algorithm hierarchical mode system - Google Patents
A kind of text based digital watermarking algorithm hierarchical mode system Download PDFInfo
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- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
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Abstract
The invention discloses a kind of text based digital watermarking algorithm hierarchical mode systems, the digital watermarking algorithm hierarchical mode system includes sequentially connected carrier layer, watermark layer, encryption layer and effect layer, the carrier layer includes the acquisition module and information hiding module being connected with each other, watermark layer includes the watermark generation module being connected with each other and embedded module, the encryption layer includes the encrypting module being connected with the watermark generation module, effect layer includes the watermark extracting module and discrimination module being connected with each other, solving many traditional media contents will change to digitlization, it is transmitted when the safety in transition process and is easy to be cracked with access control, after decryption, digital media content random can be copied, it propagates, it causes huge loss to media content manufacturer;Meanwhile the transmission of cipher-text information the problem of also easily causing the attention of attacker.
Description
Technical field
The present invention relates to digital watermarking algorithm model system, more particularly to a kind of text based digital watermarking algorithm layering
Model system.
Background technology
With popularizing for network communication, many traditional media contents all change to digitlization, and in e-commerce i.e.
The huge market share will be occupied, such as audio, the online spending of video file, the implementation energetically of digital camera, online picture, electricity
Philosophical works nationality sale etc..In wireless domain, as mobile network is by the differentiation of the second generation to the third generation, mobile subscriber will facilitate
Digital media content on internet is quickly accessed, the movie theatre of the digital media content based on wired or wireless network will be letter
Breath epoch new trend.But the safety problem of digital media content exactly restricts IT application process, although ripe password
Can solve to transmit safely and access control, but after decryption, digital media content random can be copied, pass
It broadcasts, it causes huge loss to media content manufacturer;Meanwhile the transmission of cipher-text information also easily causes the note of attacker
Meaning.
Invention content
Technical problem to be solved by the invention is to provide a kind of text based digital watermarking algorithm hierarchical mode system,
Solving many traditional media contents will change to digitlization, transmitted when the safety in transition process and be easy quilt with access control
It cracks, after decryption, digital media content random can be copied, propagate, it is caused to media content manufacturer
Huge loss；Meanwhile the transmission of cipher-text information the problem of also easily causing the attention of attacker.
The present invention provides a kind of text based digital watermarking algorithm hierarchical mode systems, wherein the digital watermarking
Algorithm hierarchical mode system includes sequentially connected carrier layer, watermark layer, encryption layer and effect layer, and the carrier layer includes mutual
The acquisition module and information hiding module of connection, watermark layer include the watermark generation module being connected with each other and embedded module, wherein
The acquisition module is connected with the watermark generation module, and described information hidden module is connected with the embedded module, institute
It includes the encrypting module being connected with the watermark generation module to state encryption layer, and effect layer includes the watermark extracting mould being connected with each other
Block and discrimination module, wherein watermark extracting module is connected with the encrypting module.
Preferably, the algorithm of the digital watermarking algorithm hierarchical mode system realizes that step is：
（1）Hiding information is converted into hexadecimal number by two-way algorithm, by accordingly calculating to obtain initial value BG；
（2）The total information of data in hierarchical data model is obtained by calculation, the initial embedded ratio drafted, so that it is determined that
Need the tuple number and generation module number of tuples of acquisition module；
（3）Polymorphic generator is modulated in embedded module using radiology system；
（4）Numeric Attributes collection is selected from extraction module to be embedded in Identification Data, data information is according to extraction module
Numerical scale determines permitted data area and threshold values, and according between user demand and the numerical characteristic of hierarchical mode
Relationship sets the small about series of He ratios En；
（5）It is expected in discrimination module arrange parameter vector sum；
（6）Step 3-4 is repeated, Text Watermarking can be obtained.
Preferably, the step（1）In, the mode of two-way algorithm is HFDD.
Preferably, the step（2）In, the initial embedded ratio is 1.6-1.8%.
Preferably, the step（3）In, the radiology system is Forosre.
Preferably, the step（3）In, the modulation parameter α=2.22587, β=0.25698.
Advantageous effect：The present invention provides a kind of text based digital watermarking algorithm hierarchical mode systems, for text
The technical issues of watermarking algorithm, proposes a kind of higher text based digital watermarking system model of safety.One kind is based on text
This digital watermarking algorithm hierarchical mode system, including sequentially connected carrier layer, watermark layer, encryption layer and effect layer.Carrier
Layer includes acquisition module and information hiding module, and the information of acquisition is transferred to the watermark layer by acquisition module, and passes through information
Hidden module hidden parts information.Watermark layer includes watermark generation module and embedded module, and watermark generation module receives acquisition mould
Watermark is generated after the information that block transmits, and data insertion is carried out to carrier layer by embedded module.Encryption layer includes encrypting module,
Encrypting module is connect with the watermark generation module.Effect layer includes watermark extracting module and discrimination module, the watermark extracting mould
Block is connect with encrypting module, and discrimination module is connect with watermark extracting module.Watermark is encrypted in encrypting module, and passes through discrimination
Module carries out effect to contents such as watermark informations, has been greatly improved the transparency, robustness, safety of digital watermarking system.
Description of the drawings
Fig. 1 is the structure chart of text based digital watermarking algorithm hierarchical mode system provided by the invention；
Wherein, 1 carrier layer, 2 watermark layers, 3 encryption layers, 4 effect layers, 11 acquisition modules, 12 information hiding modules, 21 watermarks
Generation module, 22 insertion modules, 31 encrypting modules, 41 watermark extracting modules, 42 discrimination modules.
Specific implementation mode
The following detailed description of the preferred embodiment of the present invention.
The present invention provides a kind of text based digital watermarking algorithm hierarchical mode systems, wherein the digital watermarking
Algorithm hierarchical mode system includes sequentially connected carrier layer 1, watermark layer 2, encryption layer 3 and effect layer 4, and the carrier layer 1 is wrapped
The acquisition module 11 and information hiding module 12 of interconnection are included, watermark layer 2 includes 21 He of watermark generation module being connected with each other
Embedded module 22, wherein the acquisition module 11 is connected with the watermark generation module 21,12 He of described information hidden module
The embedded module 22 is connected, and the encryption layer 3 includes the encrypting module 31 being connected with the watermark generation module 21, effect
It includes the watermark extracting module 41 being connected with each other and discrimination module 42 to test layer 4, wherein watermark extracting module 41 and the encryption mould
Block 31 is connected.
As shown in Figure 1, text digital water mark system layer model, including sequentially connected carrier layer 1, watermark layer 2, encryption
Layer 3 and effect layer 4, the carrier layer 1 include acquisition module 11 and information hiding module 12, and the acquisition module 11 is by acquisition
Information is transferred to the watermark layer 2, and passes through 12 hidden parts information of information hiding module.Carrier layer 1 is entire watermaking system
Basis, it includes the media bearer of watermark, such as PDF documents, is acquired by acquisition module 11；Information hiding module
12 have the mechanism of hiding information, ensure the sightless vision mode of image watermarking and by modulation technique or multiplexing skill
Art hides multi-bit information.Watermark layer 2 includes watermark generation module 21 and embedded module 22, and watermark generation module 21 receives acquisition mould
Watermark is generated after the information that block 11 transmits, and data insertion is carried out to carrier layer by embedded module 22.The task of watermark layer 2 is
Watermark is generated, and data insertion is carried out to carrier layer, is the key level of digital watermark, the volume controlled of digital watermarking, watermark
The problems such as coding of information, is all resolved in this layer.Encryption layer 3 includes encrypting module 31, encrypting module 31 and the watermark
Generation module 21 connects.Encryption layer 3 is that the information of watermark layer 2 is encrypted, to resist unwarranted detection and insertion etc.
Attack, it is mainly made of contents such as enciphering and deciphering algorithm, keys.Effect layer 4 includes watermark extracting module 41 and discrimination module 42,
The watermark extracting module 41 is connect with encrypting module 31, and discrimination module 42 is connect with watermark extracting module 41.Effect layer 4 it is main
Function is directly the effect to contents such as carrier itself, watermark information and writer identities to be provided, for watermark for user service
The safety of system has important role.The hierarchical mode of the above embodiment is only used for algorithm realization, and is not to text
The limitation of this algorithm, algorithm designer are not departing from this model algorithm, can be with various changes can be made and modification.
In watermark generation module 21, two-dimensional dct transform is carried out to digital picture or video piecemeal and to each image block,
Obtain each image block or the corresponding DCT coefficient matrix of video block；Water to be embedded is generated according to the watermark information to be embedded in
Official seal number；First, it is that watermark information is converted into string of binary characters；Then, Error Correction of Coding is carried out to string of binary characters to obtain
To watermark signal to be embedded；Watermark signal is embedded into each coefficient matrix；Wherein, divide first in each coefficient matrix
Not Xuan Ze three middle low frequency coefficients, and the three middle low frequency coefficients chosen in each coefficient matrix are ranked up；Then, each
For coefficient matrix in the case where the relative size relationship between keeping three middle low frequency coefficients is constant, the coefficient after adjustment sequence is two-by-two
The distance between, the coefficient matrix after being adjusted；Finally, watermark signal is embedded in each coefficient matrix after adjustment；To embedding
Each coefficient matrix after entering carries out two-dimensional dct inverse transformation, the image block after being embedded in or video block, the figure after all insertions
As the image or video after block or video block composition insertion.
The encrypting module 31 include by key generation module and pseudorandom number generator, what key generation module generated
Key triggers pseudorandom number generator and generates pseudo-random sequence, is used for encrypted watermark tomographic image, and then generate digital watermarking, it is pseudo- with
Machine number generator is a linear feedback shift register, and the key that key generation module generates is posted as linear feedback shift
The seed of storage is triggered.
In watermark extracting module 41, to the digital picture or video piecemeal of embedded watermark, and to each image block or regard
Frequency block carries out two-dimensional dct transform, obtains each image block or the corresponding DCT coefficient matrix of video block；To each of after transformation
Coefficient matrix extracts watermark signal respectively；The watermark signal of each coefficient matrix is combined, complete image or video are obtained
Watermark signal, finally watermark signal is decoded to obtain watermark information.
Emulation experiment is carried out for the PDF document digital watermarking algorithm based on hierarchical mode, experiment to the effect that exists
This paper algorithms are applied under given model data, by the insertion, extraction and detection of the Text Watermarking in hierarchical block, analysis should
The transparency, robustness and the safety of algorithm, while the integrality of text message and whole sexual function when detecting under attack.
The present invention is the PDF document digital watermarking algorithm based on hierarchical mode, which needs hiding information being embedded into
In PDF document.Hiding information does not do any restrictions as watermark information, its capacity and format, can be Chinese, English, character,
Symbol etc..Under big data environment, small more efficient of watermark hiding information capacity after text initialization or is attacked after making the most of the advantage
Expressive ability enhancing is hit, the transparency and robustness are effectively promoted simultaneously.PDF document is converted into " MODDDFFA " below
For digital watermarking, specific algorithm is illustrated：
(1) hiding information " MODDDFFA " is converted into hexadecimal number by two-way HFDD algorithms, by accordingly calculating
Obtain initial value BG { BG1BG2BG3BG4=BGi }
(2) total information of data is 389472 in hierarchical data model, and the initial embedded ratio drafted is 1.6%, to really
Surely it is also 43 to need the tuple number 623 of acquisition module, generation module number of tuples；
(3) Forosre radiology systems is utilized to modulate polymorphic generator in embedded module, α=2.22587, β=0.25698；
(4) Numeric Attributes collection is selected from extraction module to be embedded in Identification Data, data information is according to extraction module
Numerical scale determines permitted data area " γ=0.08 ", threshold values be BG, BG, BG=0.56/4,0.79/4,0.46/
4 }, according to the relationship between user demand and the numerical characteristic of hierarchical mode, a setting He ratios En small about series Cu, Cu,
Cu=0.049,0.078,0.013};
(5) in discrimination module arrange parameter vector, it is expected that { YE ', YE ', YE ' };
(6) step 3-4 is repeated, Text Watermarking can be obtained.
The present invention provides a kind of text based digital watermarking algorithm hierarchical mode systems, for text watermarking algorithm
Technical problem proposes a kind of higher text based digital watermarking system model of safety.A kind of text based number water
Print algorithm hierarchical mode system, including sequentially connected carrier layer, watermark layer, encryption layer and effect layer.Carrier layer includes acquisition
The information of acquisition is transferred to the watermark layer by module and information hiding module, acquisition module, and hidden by information hiding module
Hide partial information.Watermark layer includes watermark generation module and embedded module, and watermark generation module receives the letter that acquisition module transmits
Watermark is generated after breath, and data insertion is carried out to carrier layer by embedded module.Encryption layer includes encrypting module, encrypting module with
The watermark generation module connection.Effect layer includes watermark extracting module and discrimination module, the watermark extracting module and encryption mould
Block connects, and discrimination module is connect with watermark extracting module.Watermark is encrypted in encrypting module, and by discrimination module to watermark
The contents such as information carry out effect, have been greatly improved the transparency, robustness, safety of digital watermarking system.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection domain.
Claims (5)
1. a kind of text based digital watermarking algorithm hierarchical mode system, which is characterized in that the digital watermarking algorithm layering
Model system includes sequentially connected carrier layer, watermark layer, encryption layer and effect layer, and the carrier layer includes adopting for interconnection
Collect module and information hiding module, watermark layer includes the watermark generation module being connected with each other and embedded module, wherein the acquisition
Module is connected with the watermark generation module, and described information hidden module is connected with the embedded module, the encryption layer
Include the encrypting module being connected with the watermark generation module, effect layer includes the watermark extracting module being connected with each other and discrimination
Module, wherein watermark extracting module is connected with the encrypting module；The algorithm of the digital watermarking algorithm hierarchical mode system
Realize that step is：
(1) hiding information is converted into hexadecimal number by two-way algorithm, by accordingly calculating to obtain initial value BG；
(2) total information of data in hierarchical data model is obtained by calculation, the initial embedded ratio drafted, so that it is determined that needing
The tuple number and generation module number of tuples of acquisition module；
(3) radiology system is utilized to modulate polymorphic generator in embedded module；
(4) Numeric Attributes collection is selected from extraction module to be embedded in Identification Data, data information is according to the numerical value of extraction module
Scale determines permitted data area and threshold values, and according to the pass between user demand and the numerical characteristic of hierarchical mode
System sets the small about series of He ratios En；
(5) it is expected in discrimination module arrange parameter vector sum；
(6) step 3-4 is repeated, Text Watermarking can be obtained.
2. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 1, which is characterized in that the step
(1) in, the mode of two-way algorithm is HFDD.
3. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 1, which is characterized in that the step
(2) in, the initial embedded ratio is 1.6-1.8%.
4. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 1, which is characterized in that the step
(3) in, the radiology system is Forosre.
5. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 1, which is characterized in that the step
(3) in, parameter alpha=2.22587, β=0.25698 of modulation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102609890A (en) * | 2011-01-20 | 2012-07-25 | 北京中盈信安科技发展有限责任公司 | Image digital watermark embedding and detecting system |
| CN105306778A (en) * | 2015-10-14 | 2016-02-03 | 中国科学院大学 | Security watermark algorithm combining cryptography |
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| CN102609890A (en) * | 2011-01-20 | 2012-07-25 | 北京中盈信安科技发展有限责任公司 | Image digital watermark embedding and detecting system |
| CN105306778A (en) * | 2015-10-14 | 2016-02-03 | 中国科学院大学 | Security watermark algorithm combining cryptography |
Non-Patent Citations (1)
| Title |
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| 信息隐藏原理及数字水印技术的若干问题和趋势;刘世栋 等;《计算机工程与应用》;20031231(第12期);论文第158-159页，图1 * |
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