CN110401468A - Context-aware convert communication system and context-aware concealed communication method - Google Patents
Context-aware convert communication system and context-aware concealed communication method Download PDFInfo
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- CN110401468A CN110401468A CN201910727368.0A CN201910727368A CN110401468A CN 110401468 A CN110401468 A CN 110401468A CN 201910727368 A CN201910727368 A CN 201910727368A CN 110401468 A CN110401468 A CN 110401468A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/60—Context-dependent security
Abstract
Context-aware convert communication system and context-aware concealed communication method, the present invention relates to the fields such as wireless communication, signal detection, secret communication.It is to meet the anti-detection demand of the signal physical layer under wireless communications environment, device and method of the invention, which effectively realize, hides communication behavior, one's own side's signal of communication is pretended using the result obtained by perception to background signal and analysis, avoid detection and monitoring of the eavesdropping side to communication behavior, the physical layer anti-intercepting and capturing for being conducive to signal, improves the security performance of system.
Description
Technical field
The present invention relates to the fields such as wireless communication, signal detection, secret communication, and in particular to a kind of based on context-aware
Concealed communication method.
Background technique
In recent years, the development of cordless communication network has stepped into the right path and has just gradually moved to maturity, and digitized information is handed over
Stream mode is slowly at indispensable a part in for people's lives.With the quick increasing for the number of users that wireless network is accommodated
The continuous expansion of its application field is summed it up, people have higher requirement to the security performance of wireless communication system.
But broadcast characteristic possessed by wireless communication system is very unfavorable to the reliability and confidentiality of communication.Transmit matchmaker
Jie's opening, which determines, can carry out reception and analysis to information without barrier by any receiver in communication range.In addition,
The unstable problem of the reasons bring network structure such as mobility of wireless terminal is also very important, and dynamic topological structure is peace
Full management brings very big difficulty.Therefore, how to protect and handle sensitive data and to being related to the confidential information of key areas
Carrying out safe transmission becomes by one of issues that need special attention.
Summary of the invention
The present invention is in order to meet the anti-detection demand of the signal physical layer under wireless communications environment, to provide a kind of background
Perceive convert communication system and context-aware concealed communication method.
Context-aware convert communication system, it includes center processing control module 1, time device module 2, communication environment sense
Know module 3, communication signal emitting module 4, signal of communication generation module 5, signal of communication processing module 6；
The time signal of the time device module 2 exports or the time signal of input terminal and center processing control module 1
Input or output end connection；The environment sensing data output end and center processing control module 1 of the communication environment sensing module 3
Environment sensing data input pin connection；The signal of communication output end and signal of communication processing module 6 of signal of communication generation module 5
Signal of communication input terminal connection；The signal of communication output end and communication signal emitting module 4 of the signal of communication processing module 6
Signal of communication input terminal connection.
The center processing control module 1 stores modules and uploads for realizing the United Dispatching between modules
Information and according to corresponding information to the module of required work issue control instruction；
The time device module 2 is used to set in the background environment for updating and storing in a center processing control module 1
The time of existing signal of communication characteristic information；
The communication environment sensing module 3 for realizing signal reception and analysis, in real-time detection local environment whether
There is communication behavior and analyze communication behavior rule, and communication behavior rule that analysis is obtained and its during signal characteristic is sent to
Heart processing and control module 1；
The communication signal emitting module 4 is transmitted for the signal of communication of required transmitting to be sent in wireless channel；
The signal of communication generation module 5 is used for the instruction according to center processing control module, generates needed for one's own side's communication
The signal of transmission simultaneously inputs signal of communication processing module 6；
The information that the signal of communication processing module 6 is used to be transmitted according to central processing module is to signal of communication generation module
The signal of communication of output carries out signal processing.
Based on the above background perceive convert communication system context-aware concealed communication method, it the following steps are included:
Step 1: the place communicated required for context-aware convert communication system is installed on, and setting time device mould
Block (2) determines the time for updating signal of communication characteristic information present in a background environment；
Step 2: open context-aware convert communication system, using receiving antenna to communication behavior present in space into
Row detection and reception；
Step 3: handled using communication environment sensing module 3 signal detected, analyze the distribution of its power, when
Between the signal characteristics such as distribution, Energy distribution, and result feeding center processing control module 1 is stored, and according to time device mould
Time set by block 2 is at regular intervals updated the information stored in center processing and control module 1；
Step 4: center processing control module 1 judges whether one's own side has communication requirement, if it is judged that be it is no, then return
Receipt row step 3, if it is judged that be it is yes, then follow the steps five；
Step 5: signal of communication generation module 5 generates the required signal transmitted and inputs signal of communication processing module 6；
Step 6: center processing control module 1 judges the background communications for whether having its known signal characteristic in environment at this time
Carrying out, if it is judged that be it is no, then follow the steps seven, if it is judged that be it is yes, then follow the steps nine；
Step 7: the background communications signal characteristic information of its known signal characteristic is sent by center processing control module 1
Signal of communication processing module 6, then executes step 8；
Step 8: the data that signal of communication processing module 6 passes over signal of communication generation module 5 are handled, make
Its signal characteristic parameter meets the signal characteristic of original background communications in detected environment, then executes step 10；
Step 9: signal of communication generation module is passed over by the means spread using signal of communication processing module
Data are handled, and are made an uproar in embedded environment in ongoing communication process the bottom of as, are then executed step 10；
Step 10: signal of communication processing module 6 is by treated, signal is sent into communication signal emitting module 4, emitted day
Line or aerial array are emitted in space, are transmitted through wireless channel to purpose receiving end.
The present invention is under wireless communications environment, using communication environment sensing module to the communication situation such as surrounding enviroment on periphery
Present in communication rule and the information such as spectrum distribution perceived.By to communication behavior present in space and its specific letter
Number characteristic is detected and analyzed, and using rule is communicated existing for these environment peripheries, realizes hiding for one's own side's communication.Work as environment
In when there is no the background communications of its known signal characteristic carrying out, communication rule present in environment can be copied to one's own side's
Signal of communication is pretended, itself and the existing background communications form listener-in similar or identical with malice of out-tricking are made；Work as environment
In when thering are the background communications of its known signal characteristic carrying out, then can use the signal processing means such as spread spectrum ourselves
Signal be embedded into already existing transceiver communication process in the form that bottom is made an uproar, make one's own side communication be hidden in ambient enviroment
In, allow the listener-in of malice to ignore the presence of communication behavior.At this point, being equivalent to reduces for the former communication process in background
Its receiving end receives the signal-to-noise ratio of signal, it can't be made to readily perceive and be mixed into other communication letters in the communication process of oneself
Number, play the role of to the communication of one's own side hiding.
Device and method of the invention, which effectively realize, hides communication behavior, using passing through the perception to background signal
The result obtained with analysis pretends one's own side's signal of communication, avoids detection and monitoring of the eavesdropping side to communication behavior, has
Conducive to the physical layer anti-intercepting and capturing of signal, the security performance of system is improved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of context-aware covert communications device of the invention；
Fig. 2 is the flow diagram of context-aware covert communications device work of the invention.
Specific embodiment
Specific embodiment 1: being illustrated with reference to Fig. 1 a specific embodiment of the invention:
Covert communications device based on context-aware, it include communication environment sensing module, center processing control module, when
Between apparatus module, signal of communication generation module, signal of communication processing module and communication signal emitting module；
Whether communication environment sensing module realizes the reception and analysis to signal, logical for having in real-time detection local environment
Letter behavior and its feature is analyzed, and communication behavior rule that analysis obtains and its signal characteristic are sent to center processing control mould
Block.The content of its detection and analysis includes the existence of communication behavior, the communication rule of receiving-transmitting sides, signal form, frequency spectrum point
Cloth, signal processing mode etc..Its methods availalbe can choose energy measuring method, correlation detection, wavelet transformation detection method, time-frequency
Analytic approach etc.；
Center processing control module stores the information that modules upload for realizing the United Dispatching between modules
And control instruction is issued to the module of required work accordingly；
Time device module is used to set present in the background environment for updating and storing in a center processing control module
The time of signal of communication characteristic information.The time cycle of each setting, time module control centre processing and control module update
The information once stored；
Signal of communication generation module is used to generate when there is communication requirement according to communication information content and pass needed for one's own side's communication
Defeated signal is simultaneously inputted signal of communication processing module；
The information that signal of communication processing module is used to be transmitted according to center processing control module is to signal of communication generation module
The signal of communication of output carries out signal processing.According to the difference of the center processing control module instruction received, signal is used
Different processing means, comply with transmission requirement；
Communication signal emitting module is made of transmitting antenna or antenna array, for that will process through signal of communication processing module
The signal of communication of required transmitting be sent in wireless channel and transmit.
Specific embodiment 2: context-aware covert communications described in present embodiment and specific embodiment one fill
Set and method unlike:
In step 9, it can use the class Gaussian characteristics of weighted score Fourier transformation, at signal of communication processing module
Fractional fourier transform is weighted to signal during reason signal.The transformation of the discrete weightings fractional fourier transform of sequence
Formula is as follows:
Wherein, X0(n)、X1(n)、X2(n)、X3It (n) is respectively former sequence X0(n) pass through 0,1,2,3 obtained knot of DFT
Fruit.
The weighting coefficient that discrete weightings fractional Fourier becomes is ωl(α), l=0,1,2,3, expression formula are as follows:
Wherein, α is transformation order.Due to may make the signal after transformation to show by the order of selection transformation
The characteristic of similar Gaussian noise, therefore for eavesdropping node that may be present, use traditional blind signal detection and estimation method
It is difficult to detect the presence of the signal, hiding for signal of communication may be implemented.Meanwhile the signal by transformation will also keep original
The characteristic of signal does not influence the reception and demodulation of partner.
Specific embodiment 3: it is illustrated in combination with fig. 2 present embodiment, the context-aware based on specific embodiment one
Concealed communication method, it is realized by following steps:
Step 1: the place communicated required for the covert communications device based on context-aware is installed on, and setting time
Apparatus module determines the time for updating signal of communication characteristic information present in primary letter background environment；
Step 2: device for opening, receiving antenna starts that communication behavior present in space is detected and received；
Step 3: communication environment sensing module handles the signal detected, the distribution of its power, time point are analyzed
Result is sent into the storage of center processing control module by the signal characteristics such as cloth, Energy distribution, and according to set by time device module
Time, the information stored in the processing and control module of center is updated at regular intervals；
Step 4: center processing control module judges whether one's own side has communication requirement, if it is judged that be it is no, then return
Execute step 3, if it is judged that be it is yes, then follow the steps five；
Step 5: signal and input signal processing module that signal of communication generation module transmits needed for generating；
Step 6: center processing control module 1 judges the background communications for whether having its known signal characteristic in environment at this time
Carrying out, if it is judged that be it is no, then follow the steps seven, if it is judged that be it is yes, then follow the steps nine；
Step 7: the background communications signal characteristic information of its known signal characteristic is sent by center processing control module 1
Signal of communication processing module 6, then executes step 8；
Step 8: the data that signal of communication processing module 6 passes over signal of communication generation module 5 are handled, make
Its signal characteristic parameter meets the signal characteristic of original background communications in detected environment, then executes step 10；
Step 9: signal of communication generation module is passed over by the means spread using signal of communication processing module
Data are handled, and are made an uproar in embedded environment in ongoing communication process the bottom of as, are then executed step 10；
Step 10: signal of communication processing module 6 is by treated, signal is sent into communication signal emitting module 4, emitted day
Line or aerial array are emitted in space, are transmitted through wireless channel to purpose receiving end.
Above-mentioned example of the invention only explains computation model and calculation process of the invention in detail, and is not to this
The restriction of the embodiment of invention.It for those of ordinary skill in the art, on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (3)
1. context-aware convert communication system, it includes center processing control module (1), time device module (2), communication environment
Sensing module (3), communication signal emitting module (4), signal of communication generation module (5), signal of communication processing module (6)；
The time signal of the time device module (2) exports or the time signal of input terminal and center processing control module (1)
Input or output end connection；The environment sensing data output end and center processing of the communication environment sensing module (3) control mould
The environment sensing data input pin of block (1) connects；At the signal of communication output end and signal of communication of signal of communication generation module (5)
Manage the signal of communication input terminal connection of module (6)；The signal of communication output end of the signal of communication processing module (6) with communicate letter
The signal of communication input terminal connection of number transmitting module (4)；
The center processing control module (1) stores what modules uploaded for realizing the United Dispatching between modules
Information simultaneously issues control instruction to the module of required work according to corresponding information；
The time device module (2) is used to set in the background environment for updating and storing in a center processing control module (1)
The time of existing signal of communication characteristic information；
Whether the communication environment sensing module (3) has in real-time detection local environment for realizing the reception and analysis of signal
Communication behavior and analyze the communication behavior rule, and will analysis obtain communication behavior rule and its signal characteristic be sent to center
Processing and control module (1)；
The communication signal emitting module (4) is transmitted for the signal of communication of required transmitting to be sent in wireless channel；
The signal of communication generation module (5) is used for the instruction according to center processing control module, generates and passes needed for one's own side's communication
Defeated signal simultaneously inputs signal of communication processing module (6)；
The information that the signal of communication processing module (6) is used to be transmitted according to central processing module is defeated to signal of communication generation module
Signal of communication out carries out signal processing.
2. context-aware convert communication system according to claim 1, it is characterised in that the communication signal emitting module
(4) it is made of transmitting antenna or antenna array.
3. based on the context-aware concealed communication method of context-aware convert communication system described in claim 1, it is characterized in that:
It the following steps are included:
Step 1: the place communicated required for context-aware convert communication system is installed on, and setting time apparatus module
(2), the time for updating signal of communication characteristic information present in a background environment is determined；
Step 2: opening context-aware convert communication system, communication behavior present in space is examined using receiving antenna
It surveys and receives；
Step 3: handling using communication environment sensing module (3) the signal detected, the distribution of its power, time are analyzed
The signal characteristics such as distribution, Energy distribution, and result is sent into center processing control module (1) storage, and according to time device mould
Time set by block (2) is at regular intervals updated the information stored in center processing and control module (1)；
Step 4: center processing control module (1) judges whether one's own side has communication requirement, if it is judged that be it is no, then return
Execute step 3, if it is judged that be it is yes, then follow the steps five；
Step 5: signal of communication generation module (5) generates the required signal transmitted and inputs signal of communication processing module (6)；
Step 6: whether the judgement of center processing control module 1 is having the background communications of its known signal characteristic in environment at this time
Carry out, if it is judged that be it is no, then follow the steps seven, if it is judged that be it is yes, then follow the steps nine；
Step 7: the background communications signal characteristic information of its known signal characteristic is sent into communication by center processing control module 1
Signal processing module 6, then executes step 8；
Step 8: the data that signal of communication processing module 6 passes over signal of communication generation module 5 are handled, make its letter
Number characteristic parameter meets the signal characteristic of original background communications in detected environment, then executes step 10；
Step 9: the data passed over by the means spread to signal of communication generation module using signal of communication processing module
It is handled, makes an uproar in embedded environment in ongoing communication process the bottom of as, then execute step 10；
Step 10: treated signal is sent into communication signal emitting module 4 by signal of communication processing module 6, emitted antenna or
Aerial array is emitted in space, is transmitted through wireless channel to purpose receiving end.
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Cited By (2)
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| CN111614590A (en) * | 2020-05-18 | 2020-09-01 | 哈尔滨工业大学 | Anti-detection transmission method based on extended weighted fractional Fourier transform |
| WO2022123195A1 (en) * | 2020-12-11 | 2022-06-16 | Massive Analytic Limited | Apparatus for generating covert radio communications |
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