CN108989816A - A kind of coded channel information hidden method based on wavelet transformation - Google Patents
A kind of coded channel information hidden method based on wavelet transformation Download PDFInfo
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- H—ELECTRICITY
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/46—Embedding additional information in the video signal during the compression process
- H04N19/467—Embedding additional information in the video signal during the compression process characterised by the embedded information being invisible, e.g. watermarking
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- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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Abstract
The invention discloses a kind of coded channel information hidden method based on wavelet transformation, it include: that (1) pre-processes secret information, it include: that (1-1) uses different channels coding method and constellation mapping to public information and secret information respectively, to generate the identical modulation symbol sequence of degree；(1-2) carries out orthogonal transformation to constellation symbol using orthogonal wavelet function, generates the road I and the road the Q signal of convergent white noise characteristics；(1-3) carries out signal location adjustment to the obtained road I signal and the road Q signal using the interleaver matrix prestored；(2) the pseudo- white noise signal for carrying secret information is directly superimposed upon in the constellation symbol of public information and forms mixed signal；(3) emit mixed signal；(4) receiving end handles the mixed signal received, obtains secret information.Even if understanding basic principle of the invention, but the judgement of high precision can not be still carried out to the secret information existence in communication process in the case where not knowing key.
Description
Technical field
The present invention relates to Information hiding fields more particularly to a kind of coded channel information based on wavelet transformation to hide side
Method.
Background technique
Information hiding is to be hidden in confidential information in public information in confidence, then passes through open letter on open channel
Confidential information is transmitted in the transmission of breath.Whether third party by perceived resolution due to being limited, it is difficult to judge embedding in public information
Secret information is covered, to guarantee the imperceptible of confidential corespondence.
The research of Information Hiding Techniques at present is concentrated mainly on to be carried out on the carriers such as text, image, audio and video.And
The research object of this paper is the Communication hiding technology in radio digital communication system, i.e., sender makes on open wireless channel
The hiding information of certain information content is embedded in the wireless communication signals sent with Open Standard, covert communications recipient can pass through
Certain way accurately parses the secret information, even and if monitoring side understands the basic principle of this method, but it is close not knowing
The judgement of high accuracy can not be still carried out in the case where key to the secret information existence in communication process.
Information hiding communication essence be using on open channel can public information normal transmission process shielding
Secret information transmitting is carried out, makes non-targeted user that can not perceive the presence of secret information itself or even information transmitting behavior.Cause
This, convert communication system must have very high concealment, robustness and safety.
Information hiding communication system must guarantee the robustness of system under the premise of this is primary in highly concealed type.Concealment
Refer to the not sentience of secret information, i.e., the transmission signal after insertion secret information is no matter from time domain, frequency domain character component
See or demodulation result cannot all there is perceptible exception；Robustness then requires covert communications receiving end that can mix from aerial
It closes and accurately recovers secret information in signal.
Nineteen eighty-three Simmons proposes " convict problem " in international cryptography scientific seminar, this becomes present information
Hiding universal theory model.In view of the continuous promotion with digital signal processing capability, monitoring side is not considering cost
In the case of, can theoretically have superpower signal mobile phone and analysis ability on public open channel, therefore in wireless encoding
For Information Hiding Algorithms design on channel, ideal algorithm needs to have following characteristic:
The confidentiality of algorithm: algorithm principle more maintains secrecy, and targetedly analytical technology is more difficult to enemy's development, therefore the algorithm is answered
This is not publicly delivered.It is analytical that algorithm resists exhaustion: even if enemy has recognized algorithm principle by all means, the calculation
Method can also resist the exhaustion analysis of other side by tending to infinite and time-varying key space.
Hiding information insertion public information mode be determine hide performance basis, design concept be have it is split
After putting the carrying signal of detecting side's removal public information of all signal resolution abilities of channel, it is embedded in the residue of hiding information
The feature that the feature of signal will not be embedded in the residual signal of the signal of communication of hiding information with other keeps height consistent.Otherwise
Though detecting side still can be by inversely pushing away even if the insertion of hiding information is either with or without causing the reception of public information mistake occur
Lead or judge to the analysis of residual signal the existence of hiding information.And for the open letter of no nested hiding information
For number, it is resonable want to go to place signal of communication ingredient after, residual signal is the white noise signal of a Gaussian distributed certainly.
Summary of the invention
The purpose of the present invention is to provide a kind of coded channel information hidden method based on wavelet transformation.The present invention realizes
The signal of communication feature of mixed signal and signal of communication without hiding information are convergent in time domain and frequency domain, ensure that simultaneously
After deleting open signal component, the feature of residual signal is also equal to white noise, improve covert communications process safety and
Concealment.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of coded channel information hidden method based on wavelet transformation, specific steps include:
(1) secret information is pre-processed, the pretreatment includes:
(1-1) is based on respective information rate, uses different channels coding method respectively to public information and secret information
And constellation mapping, to generate the identical modulation symbol sequence of degree；
(1-2) carries out orthogonal transformation to constellation symbol using orthogonal wavelet function, and the I for generating convergent white noise characteristics is (real
Portion) road and the road Q (empty road) signal；
(1-3) carries out signal location adjustment to the obtained road I signal and the road Q signal using the interleaver matrix prestored；
(2) according to certain power sharing ratio, the pseudo- white noise signal for carrying secret information is directly superimposed upon disclosure
Mixed signal is formed in the constellation symbol of information；
(3) rule or standard emission mixed signal are sent using the prepared power of open channel；
(4) receiving end handles the mixed signal received, obtains secret information.
Specifically, orthogonal transformation is carried out using orthogonal wavelet in the step (1-2), it is therefore an objective to orthogonal small using some
Wave base carries out linear transformation, such as qam symbol, so that transformed signal of communication has similar to white Gaussian to modulation symbol
The signal characteristic of noise.
Further, the difficulty that can be analyzed after the technical program design principle with specific aim is known in order to increase enemy
Degree, should choose one to the selection of Orthogonal Wavelets from following two methods:
1, establishing one can have the set of the Orthogonal Wavelets of modulated signal white Gaussian noise ability, compile every time
Code is all based on pseudo-random fashion and selects one from set；
2, presently, there are the building methods of a large amount of known Orthogonal Wavelets, and constantly there are many new structural theory and sides
Method occurs.It therefore can be by selecting some Orthogonal Wavelets that do not delivered in open source literature or new orthogonal of autonomous construction
Wavelet basis avoids the other side from knowing this messaging parameter.
Further, will not cause to investigate because there is notable difference on the road I and the road Q to guarantee to receive signal
The vigilance of side, therefore the constellation mapping of secret information and public information all while using real number is newly mapped or constellation of complex figure, permits
Perhaps different planispheres is used.
Specifically, the method for mixed signal is generated in the step (2) are as follows:
(2-1) sets signal of the secret information after coded modulation and is denoted as X[n],X[n]∈ Q, n=1,2 ..., N, Q are represented
Constellation point sets, and ordered series of numbers p[n]And q[n], n=1,2 ..., M respectively represents the scaling function coefficient of a certain orthogonal wavelet and small
Wave function coefficient, the signal after wavelet transformation are denoted as
(2-2) sets signal of the public information after coded modulation and is denoted as It represents
Constellation point sets, then mixed signal is denoted as:
Wherein λ1And λ2Respectively indicate the power sharing ratio of public information signal and secret information signal.
Further, in order to guarantee the received correctness of public information signal, and mixed signal is not nested secret with other
Otherness between the normal signal of confidential information in same channel stills remain in the reasonable fluctuating level of wireless channel
Under, therefore it is required that λ1≥20λ2, that is, the power level for disclosing signal will account for 95% ratio or more, and information rate is much smaller than open
The secret information of information then uses the lower coding method of code rate, guarantees that it remains to be properly received under low signal-to-noise ratio situation.
Specifically, in the step (4), the method for reseptance of receiving end are as follows:
(4-1) is correctly solved to signal is received using the canonical algorithm progress channel estimation of open channel and signal interpretation
The bit data of public information is precipitated；
(4-2) based on channel estimation and signal interpretation as a result, reconstruct public information transmission signal, by signal cancellation from
Receive the signal component that public information is directly removed in signal；
The interleaver matrix that (4-3) is prestored in advance according to communicating pair carries out inverse interleaving treatment to residual signal；
(4-4) recipient carries out subsequent conventional channel based on the signal after inverse interleaving treatment and decodes process, and last solution
Analyse the bit data of secret information.
Further, in the step (4-3), the signal obtained after inverse intertexture isIts is corresponding
Inverse wavelet transform algorithm are as follows:
Inverse transformation signal Y is obtained after the completion of inverse transformation[n], n=1 ..., N.
The present invention compared to the prior art, have it is below the utility model has the advantages that
1, the present invention for secret information provide a kind of signal Gaussian technology based on small echo orthogonal transformation and its
The embedded mode of open signal, realizes the signal of communication feature of mixed signal and the signal of communication without hiding information in time domain and frequency
It is convergent on domain, while guaranteeing after deleting open signal component, the feature of residual signal is equal to white noise, improves hidden logical
The safety and concealment of letter process.
Detailed description of the invention
Fig. 1 is a kind of step flow chart of coded channel information hidden method based on wavelet transformation；
Fig. 2 is the schematic diagram of the scaling function coefficient of orthogonal wavelet in embodiment；
Fig. 3 is the schematic diagram of the wavelet function coefficient of orthogonal wavelet in embodiment；
Fig. 4 is 4QAM modulation constellation in embodiment；
Fig. 5 is the Gauss complex signal figure in embodiment after wavelet transformation；
Fig. 6 is the comparison diagram of the time-domain signal in embodiment after wavelet transformation；
Fig. 7 is the signal amplitude statistical conditions comparison diagram in embodiment after wavelet transformation；
Fig. 8 is in embodiment not by wavelet transformation and the comparison diagram for finally receiving signal after wavelet transformation.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
A kind of coded channel information hidden method based on wavelet transformation, specific steps include:
(1) secret information is pre-processed, the pretreatment includes:
(1-1) is based on respective information rate, uses different channels coding method respectively to public information and secret information
And constellation mapping, to generate the identical modulation symbol sequence of degree；
(1-2) using orthogonal wavelet function to constellation symbol carry out orthogonal transformation, generate convergent white noise characteristics the road I and
The road Q signal；
(1-3) carries out signal location adjustment to the obtained road I signal and the road Q signal using the interleaver matrix prestored；
(2) according to certain power sharing ratio, the pseudo- white noise signal for carrying secret information is directly superimposed upon disclosure
Mixed signal is formed in the constellation symbol of information；
(3) rule transmitting mixed signal is sent using the prepared power of open channel；
(4) receiving end handles the mixed signal received, obtains secret information.
Specifically, if ordered series of numbers p[n]And q[n], n=1,2 ..., N respectively indicates the scaling function system of a certain orthogonal wavelet
Several and wavelet function coefficient, then to any ordered series of numbersDecomposition algorithm it is as follows:
Its restructing algorithm is as follows:
And meet the energy invariance equation for decomposing front and back
Wherein, ordered series of numbers c[j+1,k]First expression number of plies of subscript, second expression integer axis.
In the present embodiment, the scaling function coefficient schematic diagram of used orthogonal wavelet and wavelet function coefficient schematic diagram
It is as shown in Figures 2 and 3 respectively.
In the present embodiment, in step (1-2), the planisphere obtained after being modulated to 4QAM symbol is as shown in Figure 4.
10000 4QAM symbols are converted using above-mentioned orthogonal wavelet, transformed signal distributions situation is as shown in Figure 5.And it is small
The real part that real part time-domain signal, received signal to noise ratio after wave conversion are 0dB receives time-domain signal and pure white Gaussian noise time domain
The case where signal, as shown in three subgraphs in Fig. 6 from top to bottom.Imaginary part time-domain signal is also similar with real part time-domain signal.It is right
It answers, the statistical conditions that signal amplitude corresponding to three subgraphs is distributed in Fig. 6 respectively correspond three sons in Fig. 7 from left to right
Figure.
As seen from Figure 7, the transmission signal after carrying out wavelet transformation has been equal to white Gaussian noise letter in the time domain
Number so that the reception signal of enemy's receiver is also equal to white Gaussian noise, thus allow detection algorithm be not equipped with it is small
In the case where wave conversion and signal interleaving parameter it is difficult that the signal and pure ambient noise are distinguished and identified.
The essence of orthogonal wavelet transformation is to carry out a sub-orthogonal transforation to modulation symbol, will not be with signal communication performance
Loss.Be illustrated in figure 8 signal distributions situation of the 4QAM symbol in awgn channel under 10dB signal-to-noise ratio and same channel and
Orthogonal wavelet transformation, and the signal distributions feelings in receiving end after wavelet inverse transformation link are used under identical state of signal-to-noise
Condition.It can be seen from the figure that two kinds of communication performance be to maintain it is consistent.
The essence of Information hiding transmission method in the present embodiment is that the lower secret information of information rate is carried out code
The lower coding of rate and constellation mapping are then mapped as the pseudo- white noise signal for having gaussian distribution characteristic.It is adopted
Embedded mode is that the signal is directly superimposed upon on powerful open signal with low power mode, therefore in transmission
Certain performance loss can be brought in the process.On awgn channel, the mode of the mapping specifically:
P1+P2=P
Wherein, P indicates that signal transmitting power, N indicate that channel noise power, P1 indicate the public information letter in mixed signal
Number send power, P2 indicate mixed signal in secret information signal transmitting power, SNR1 indicate without insertion hiding information letter
Number received signal to noise ratio, SNR2 indicates to disclose the received signal to noise ratio of signal in mixed signal, and SNR3 indicates that mixed signal ideal is supported
The received signal to noise ratio of tick-tack after the disclosure that disappears signal.
According to the present embodiment it is found that principle for understanding this technology method but not knowing interleaver matrix information (key)
For detecting side, the wireless signal received is only the signal of communication for normally receiving noise pollution, and offsets open letter
After information signal, residual signal is also only a white noise signal.In view of the presence of other normal signals on open wireless channel
Property and mutually interference and the time variation and complexity of wireless channel are detectd in the lower situation of tick-tack nesting power level
Survey side can not carry out the judgement of high accuracy to the existence of the secret information in normal communications signal.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. a kind of coded channel information hidden method based on wavelet transformation, which is characterized in that the specific steps packet of the method
It includes:
(1) secret information is pre-processed, the pretreatment includes:
(1-1) is based on respective information rate, uses different channels coding method and star respectively to public information and secret information
Seat mapping, to generate the identical modulation symbol sequence of degree；
(1-2) carries out orthogonal transformation to constellation symbol using orthogonal wavelet function, generates the road I and the road Q of convergent white noise characteristics
Signal；
(1-3) carries out signal location adjustment to the obtained road I signal and the road Q signal using the interleaver matrix prestored；
(2) according to certain power sharing ratio, the pseudo- white noise signal for carrying secret information is directly superimposed upon public information
Constellation symbol on form mixed signal；
(3) rule transmitting mixed signal is sent using the prepared power of open channel；
(4) receiving end handles the mixed signal received, obtains secret information.
2. a kind of coded channel information hidden method based on wavelet transformation according to claim 1, which is characterized in that institute
State in step (1-2) and orthogonal transformation carried out using orthogonal wavelet, it is therefore an objective to using some Orthogonal Wavelets to modulation symbol into
Row linear transformation, so that transformed signal of communication has the signal characteristic similar to white Gaussian noise.
3. a kind of coded channel information hidden method based on wavelet transformation according to claim 2, which is characterized in that be
Increase enemy and knows the difficulty that can be analyzed after the technical program design principle with specific aim, the selection to Orthogonal Wavelets
One should be chosen from following two methods:
1, it establishes one to have the set of the Orthogonal Wavelets of modulated signal white Gaussian noise ability, coding is all based on every time
Pseudo-random fashion selects one from set；
2, by select some Orthogonal Wavelets that do not delivered in open source literature or independently construct new Orthogonal Wavelets come
Other side is avoided to know this messaging parameter.
4. a kind of coded channel information hidden method based on wavelet transformation according to claim 1, which is characterized in that be
Guarantee that the vigilance of investigation side, secret information will not be led on the road I and the road Q because there is notable difference by receiving signal
It is all newly mapped using real number or constellation of complex figure, is allowed using different planispheres simultaneously with the constellation mapping of public information.
5. a kind of coded channel information hidden method based on wavelet transformation according to claim 1, which is characterized in that
The method of mixed signal is generated in the step (2) are as follows:
(2-1) sets signal of the secret information after coded modulation and is denoted as X[n],X[n]∈ Q, n=1,2 ..., N, Q represent constellation
Point set, and ordered series of numbers p[n]And q[n]The scaling function coefficient and wavelet function coefficient of a certain orthogonal wavelet are respectively represented, small echo becomes
Signal after changing is denoted as
(2-2) sets signal of the public information after coded modulation and is denoted as Represent constellation
Point set, then mixed signal is denoted as:
Wherein λ1And λ2Respectively indicate the power sharing ratio of public information signal and secret information signal.
6. a kind of coded channel information hidden method based on wavelet transformation according to claim 5, which is characterized in that be
Guarantee public information signal received correctness, and between mixed signal and the normal signal of other not nested secret informations
Otherness in the case of same channel stills remain under the reasonable fluctuating level of wireless channel, therefore it is required that λ1≥20λ2, i.e., public
The power level of ON signal will account for 95% ratio or more, and information rate is much smaller than the secret information of public information, then use code
The lower coding method of rate guarantees that it remains to be properly received under low signal-to-noise ratio situation.
7. a kind of coded channel information hidden method based on wavelet transformation according to claim 1, which is characterized in that institute
It states in step (4), the method for reseptance of receiving end are as follows:
(4-1) is correctly parsed to signal is received using the canonical algorithm progress channel estimation of open channel and signal interpretation
The bit data of public information；
(4-2) based on channel estimation and signal interpretation as a result, the transmission signal of reconstruct public information, by signal cancellation from reception
The signal component of public information is directly removed in signal；
The interleaver matrix that (4-3) is prestored in advance according to communicating pair carries out inverse interleaving treatment to residual signal；
(4-4) recipient carries out subsequent conventional channel based on the signal after inverse interleaving treatment and decodes process, and finally parses secret
The bit data of confidential information.
8. a kind of coded channel information hidden method based on wavelet transformation according to claim 7, which is characterized in that institute
It states in step (4-3), the signal obtained after inverse intertexture isIts corresponding inverse wavelet transform algorithm are as follows:
Wherein, ordered series of numbers p[n]And q[n]Respectively represent the scaling function coefficient and wavelet function coefficient of a certain orthogonal wavelet, inverse transformation
Inverse transformation signal Y is obtained after the completion[n], n=1 ..., N.
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