CN105787307A - Digital watermark algorithm hierarchical model system based on texts - Google Patents
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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 digital watermark algorithm hierarchical model system based on texts. The digital watermark algorithm hierarchical model system comprises a carrier layer, a watermark layer, an encryption layer and a verification layer which are sequentially connected. The carrier layer comprises an acquisition module and an information hiding module which are connected. The watermark layer comprises a watermark generation module and an embedding module which are connected. The encryption layer comprises an encryption module connected with the watermark generation module. The verification layer comprises a watermark extraction module and a distinguishing module which are connected. The problems that multiple traditional media contents need to be converted into digital contents, security transfer and access control in the conversion process are prone to cracking, once decryption is achieved, the digital media contents can be coped and propagated randomly, and great losses are caused to media content manufacturers are solved; meanwhile the problem that transfer of ciphertext information is easily noticed by attackers is solved.
Description
Technical field
The present invention relates to digital watermarking algorithm model system, particularly to a kind of text based digital watermarking algorithm hierarchical mode system.
Background technology
Along with popularizing of network service, many traditional media contents all change to digitized, and are about to occupy the huge market share in ecommerce, such as the online spending of audio frequency, video file, the implementation energetically of digital camera, online picture, e-book sale etc..In wireless domain, along with mobile network is by the differentiation of the second filial generation to the third generation, mobile subscriber can access digital media content on the Internet easily and fast, is about to be information age new trend based on the movie theatre of the digital media content of wired or wireless network.But, the safety problem of digital media content exactly governs IT application process, although ripe cryptography can solve safety transmission and accessing and control, but once after deciphering, digital media content just can be random be copied, propagate, it causes huge loss to media content manufacturer;Meanwhile, the transmission of cipher-text information is also easily caused by the attention of assailant.
Summary of the invention
The technical problem to be solved is to provide a kind of text based digital watermarking algorithm hierarchical mode system, solve many traditional media contents to change to digitized, transmit when the safety in transition process and access and control easily to be cracked, once after deciphering, digital media content just can be random be copied, propagate, it causes huge loss to media content manufacturer；Meanwhile, the transmission of cipher-text information is also easily caused by the problem of the attention of assailant.
The invention provides a kind of text based digital watermarking algorithm hierarchical mode system, wherein, described digital watermarking algorithm hierarchical mode system includes the carrier layer being sequentially connected with, watermark layer, encryption layer and effect layer, described carrier layer includes interconnective acquisition module and information hiding module, watermark layer includes interconnective watermark generation module and embeds module, wherein, described acquisition module is connected with described watermark generation module, described information hiding module is connected with described embedding module, described encryption layer includes the encrypting module being connected with described watermark generation module, effect layer includes interconnective watermark extracting module and discrimination module, wherein, watermark extracting module is connected with described encrypting module.
Preferably, the algorithm of described digital watermarking algorithm hierarchical mode system realizes step and is:
(1) hiding information is converted to hexadecimal number by two-way algorithm, by calculating initial value BG accordingly；
(2) obtaining the total information of data in hierarchical data model by calculating, the initial embedding ratio drafted, so that it is determined that need tuple number and the generation module number of tuples of acquisition module；
(3) utilize radiology system that polymorphic generator is being embedded module modulation；
(4) from extraction module, Numeric Attributes collection is selected to embed Identification Data, data message determines the scope of data and threshold values that allow according to the numerical scale of extraction module, and according to the relation between user's request and the numerical characteristic of hierarchical mode, setting He is little about progression than En；
(5) parameter vector and expectation are set in discrimination module；
(6) step 3-4 is repeated, it is possible to obtain Text Watermarking.
Preferably, in described step (1), the mode of two-way algorithm is HFDD.
Preferably, in described step (2), described initial embedding ratio is 1.6-1.8%.
Preferably, in described step (3), described radiology system is Forosre.
Preferably, in described step (3), described modulation parameter α=2.22587, β=0.25698.
Beneficial effect: the invention provides a kind of text based digital watermarking algorithm hierarchical mode system, for the technical problem of text watermarking algorithm, it is proposed to the text based digital watermarking system model that a kind of safety is higher.A kind of text based digital watermarking algorithm hierarchical mode system, including the carrier layer being sequentially connected with, watermark layer, encryption layer and effect layer.Carrier layer includes acquisition module and information hiding module, and the information of collection is transferred to described watermark layer by acquisition module, and by information hiding module hidden parts information.Watermark layer includes watermark generation module and embeds module, and watermark generation module produces watermark after receiving the information that acquisition module transmits, and by embedding module, carrier layer is carried out data embedding.Encryption layer includes encrypting module, and encrypting module is connected with described watermark generation module.Effect layer includes watermark extracting module and discrimination module, and this watermark extracting module is connected with encrypting module, and discrimination module is connected with watermark extracting module.Watermark is encrypted by encrypting module, and by discrimination module, the contents such as watermark information is carried out effect, has been greatly improved the transparency of digital watermarking system, robustness, safety.
Accompanying drawing explanation
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 watermark generation module, 22 embed module, 31 encrypting modules, 41 watermark extracting modules, 42 discrimination module.
Detailed description of the invention
The following detailed description of the preferred embodiment of the present invention.
The invention provides a kind of text based digital watermarking algorithm hierarchical mode system, wherein, described digital watermarking algorithm hierarchical mode system includes the carrier layer 1 being sequentially connected with, watermark layer 2, encryption layer 3 and effect layer 4, described carrier layer 1 includes interconnective acquisition module 11 and information hiding module 12, watermark layer 2 includes interconnective watermark generation module 21 and embeds module 22, wherein, described acquisition module 11 is connected with described watermark generation module 21, described information hiding module 12 is connected with described embedding module 22, described encryption layer 3 includes the encrypting module 31 being connected with described watermark generation module 21, effect layer 4 includes interconnective watermark extracting module 41 and discrimination module 42, wherein, watermark extracting module 41 is connected with described encrypting module 31.
As shown in Figure 1, text digital water mark system layer model, including the carrier layer 1 being sequentially connected with, watermark layer 2, encryption layer 3 and effect layer 4, described carrier layer 1 includes acquisition module 11 and information hiding module 12, the information of collection is transferred to described watermark layer 2 by described acquisition module 11, and by information hiding module 12 hidden parts information.Carrier layer 1 is the basis of whole watermaking system, and it includes the media bearer of watermark, and such as documents such as PDF, it is acquired by acquisition module 11；Information hiding module 12 has the mechanism of hiding information, guarantees the sightless vision mode of image watermarking and hide multidigit information by modulation technique or multiplex techniques.Watermark layer 2 includes watermark generation module 21 and embeds module 22, and watermark generation module 21 produces watermark after receiving the information that acquisition module 11 transmits, and by embedding module 22, carrier layer is carried out data embedding.The task of watermark layer 2 is to produce watermark, and carrier layer is carried out data embedding, is the key level of digital watermark, the volume control of digital watermarking, watermark information the problem such as coding all solved at this layer.Encryption layer 3 includes encrypting module 31, and encrypting module 31 is connected with described watermark generation module 21.Encryption layer 3 is that the information to watermark layer 2 is encrypted, and to resist the attacks such as unwarranted detection and embedding, it is mainly made up of the content such as enciphering and deciphering algorithm, key.Effect layer 4 includes watermark extracting module 41 and discrimination module 42, and this watermark extracting module 41 is connected with encrypting module 31, and discrimination module 42 is connected with watermark extracting module 41.The major function of effect layer 4 is directly to service for user, it is provided that the effect to contents such as carrier itself, watermark information and writer identities, the safety for watermaking system has important effect.The hierarchical mode of above-mentioned embodiment is intended for the use of algorithm realization, and is not the restriction to text algorithm, and algorithm designer is without departing from this model algorithm situation, it is also possible to make various change and modification.
In watermark generation module 21, to digital picture or video piecemeal and each image block is carried out two-dimensional dct transform, obtain each image block or the corresponding DCT coefficient matrix of video block；Watermark signal to be embedded is generated according to the watermark information to embed；First, it is that watermark information is converted to string of binary characters；Then, string of binary characters is carried out Error Correction of Coding and obtain watermark signal to be embedded；Watermark signal is embedded in each coefficient matrix；Wherein, in each coefficient matrix, first select three medium and low frequency coefficients respectively, and three the medium and low frequency coefficients chosen in each coefficient matrix are ranked up；Then, each coefficient matrix, when keeping the relative size relation between three medium and low frequency coefficients constant, adjusts the distance between any two of the coefficient after sequence, the coefficient matrix after being adjusted；Finally, each coefficient matrix after adjusting is embedded watermark signal；Each coefficient matrix after embedding is carried out two-dimensional dct inverse transformation, image block after being embedded or video block, the image block after all embeddings or the image after video block composition embedding or video.
Described encrypting module 31 includes by key generation module and pseudorandom number generator, the key that key generation module generates triggers pseudorandom number generator and produces pseudo-random sequence, for encrypted watermark tomographic image, and then generation digital watermarking, pseudorandom number generator is a linear feedback shift register, and the key that key generation module produces is that the seed as linear feedback shift register triggers.
In watermark extracting module 41, to embedding the digital picture of watermark or video piecemeal, and each image block or video block are carried out two-dimensional dct transform, obtain each image block or the corresponding DCT coefficient matrix of video block；Each coefficient matrix after conversion is extracted watermark signal respectively；The watermark signal of each coefficient matrix is combined, obtains the watermark signal of complete image or video, finally watermark signal decoding is obtained watermark information.
Emulation experiment is carried out for the PDF document digital watermarking algorithm based on hierarchical mode, the to the effect that application algorithm herein under given model data of experiment, by in the embedding of hierarchical block Chinese version watermark, extraction and detection, analyze the transparency of this algorithm, robustness and safety, the integrity of text message and globality function when detecting under attack simultaneously.
The present invention is based on the PDF document digital watermarking algorithm of hierarchical mode, and this algorithm needs to be embedded in PDF document hiding information.The information of hiding is as watermark information, and its capacity and form do not do any restriction, it is possible to be Chinese, English, character, symbol etc..Under big data environment, the little relatively effective percentage of information capacity is hidden in watermark, and expressive ability strengthens after after making the most of the advantage, text initializes or in attacking, and the transparency and robustness are effectively promoted simultaneously.It is converted into PDF document digital watermarking for " MODDDFFA " below, sets forth specific algorithm:
(1) hiding information " MODDDFFA " is converted to hexadecimal number by two-way HFDD algorithm, by calculating initial value BG{BG1BG2BG3BG4=BGi} accordingly
(2) in hierarchical data model, the total information of data is 389472, and the initial embedding ratio drafted is 1.6%, so that it is determined that need the tuple number 623 of acquisition module, generation module number of tuples is also 43；
(3) utilize Forosre radiology system that polymorphic generator is being embedded module modulation, α=2.22587, β=0.25698；
(4) selecting Numeric Attributes collection from extraction module to embed Identification Data, data message determines the scope of data " γ=0.08 " allowed according to the numerical scale of extraction module, and threshold values is { BG, BG, BG=0.56/4,0.79/4,0.46/4}, according to the relation between user's request and the numerical characteristic of hierarchical mode, setting He is little about progression { Cu, Cu, a Cu=0.049 than En, 0.078,0.013};
(5) parameter vector is set in discrimination module, it is desirable to { YE ', YE ', YE ' };
(6) step 3-4 is repeated, it is possible to obtain Text Watermarking.
The invention provides a kind of text based digital watermarking algorithm hierarchical mode system, for the technical problem of text watermarking algorithm, it is proposed to the text based digital watermarking system model that a kind of safety is higher.A kind of text based digital watermarking algorithm hierarchical mode system, including the carrier layer being sequentially connected with, watermark layer, encryption layer and effect layer.Carrier layer includes acquisition module and information hiding module, and the information of collection is transferred to described watermark layer by acquisition module, and by information hiding module hidden parts information.Watermark layer includes watermark generation module and embeds module, and watermark generation module produces watermark after receiving the information that acquisition module transmits, and by embedding module, carrier layer is carried out data embedding.Encryption layer includes encrypting module, and encrypting module is connected with described watermark generation module.Effect layer includes watermark extracting module and discrimination module, and this watermark extracting module is connected with encrypting module, and discrimination module is connected with watermark extracting module.Watermark is encrypted by encrypting module, and by discrimination module, the contents such as watermark information is carried out effect, has been greatly improved the transparency of digital watermarking system, robustness, safety.
Above-described is only the preferred embodiment of the present invention, it is noted that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.
Claims (6)
1. a text based digital watermarking algorithm hierarchical mode system, it is characterized in that, described digital watermarking algorithm hierarchical mode system includes the carrier layer being sequentially connected with, watermark layer, encryption layer and effect layer, described carrier layer includes interconnective acquisition module and information hiding module, watermark layer includes interconnective watermark generation module and embeds module, wherein, described acquisition module is connected with described watermark generation module, described information hiding module is connected with described embedding module, described encryption layer includes the encrypting module being connected with described watermark generation module, effect layer includes interconnective watermark extracting module and discrimination module, wherein, watermark extracting module is connected with described encrypting module.
2. text based digital watermarking algorithm hierarchical mode system according to claim 1, it is characterised in that the algorithm of described digital watermarking algorithm hierarchical mode system realizes step and is:
(1) hiding information is converted to hexadecimal number by two-way algorithm, by calculating initial value BG accordingly；
(2) obtaining the total information of data in hierarchical data model by calculating, the initial embedding ratio drafted, so that it is determined that need tuple number and the generation module number of tuples of acquisition module；
(3) utilize radiology system that polymorphic generator is being embedded module modulation；
(4) from extraction module, Numeric Attributes collection is selected to embed Identification Data, data message determines the scope of data and threshold values that allow according to the numerical scale of extraction module, and according to the relation between user's request and the numerical characteristic of hierarchical mode, setting He is little about progression than En；
(5) parameter vector and expectation are set in discrimination module；
(6) step 3-4 is repeated, it is possible to obtain Text Watermarking.
3. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 2, it is characterised in that in described step (1), the mode of two-way algorithm is HFDD.
4. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 2, it is characterised in that in described step (2), described initial embedding ratio is 1.6-1.8%.
5. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 2, it is characterised in that in described step (3), described radiology system is Forosre.
6. the algorithm of digital watermarking algorithm hierarchical mode system according to claim 2, it is characterised in that in described step (3), described modulation parameter α=2.22587, β=0.25698.
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| US20100281545A1 (en) * | 2000-07-20 | 2010-11-04 | Levy Kenneth L | Using Embedded Data with File Sharing |
| 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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| US20100281545A1 (en) * | 2000-07-20 | 2010-11-04 | Levy Kenneth L | Using Embedded Data with File Sharing |
| 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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| 刘世栋 等: "信息隐藏原理及数字水印技术的若干问题和趋势", 《计算机工程与应用》 * |
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| CN111431861A (en) * | 2020-02-28 | 2020-07-17 | 长沙师范学院 | Digital text protection device, control method and control terminal |
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