CN106712890A - Transmitting terminal and receiving terminal of secure communication system - Google Patents
Transmitting terminal and receiving terminal of secure communication system Download PDFInfo
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- CN106712890A CN106712890A CN201611128442.XA CN201611128442A CN106712890A CN 106712890 A CN106712890 A CN 106712890A CN 201611128442 A CN201611128442 A CN 201611128442A CN 106712890 A CN106712890 A CN 106712890A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
Abstract
The invention discloses a transmitting terminal and a receiving terminal of a secure communication system. The transmitting terminal comprises a main laser, an external cavity of the main laser and an information encryption module, the external cavity of the main laser is provided with a feedback cavity, and the laser emitted by the main laser forms a feedback loop after passing through the feedback cavity, so that the main laser works in a chaotic state. A phase modulator is arranged in the feedback loop of the laser, the phase modulator performs phase modulation on the light in the feedback loop according to a phase key, and the phase key is a pseudo-random sequence. A chaotic laser signal emitted by the main laser working in the chaotic state is transmitted by the information encryption module. Only when the laser of the receiving terminal has the same feedback structure and phase modulation as the main laser, the information can be correctly demodulated. Meanwhile, a plurality of feedback external cavities of high-speed phase modulation can also hide a delay tag of chaotic laser, and thus the security of the communication system is improved.
Description
Technical field
The present invention relates to secret communication field, the transmitting terminal and receiving terminal of more particularly to a kind of secret signalling.
Background technology
With computer and the high speed development of mechanics of communication, and internet+epoch arrival, network it is open, mutual
Lian Xing, sharing expand rapidly, and the mankind are increasing to the dependence of network, and thing followed information security hidden danger is also increasingly
Many, information security has become one of major issue of whole world care, and 18 the fifth plenary sessions of China clearly will " network power
Strategy " includes the Strategic System of " 13 " planning.Chaotic secret communication technology is due to that can provide efficient safety of physical layer
And receive significant attention, but found in the current application based on chaotic communication system and research existing mixed based on laser
Be present the potential safety hazards such as the outer-cavity structure of time delay label leakage chaos semiconductor laser in ignorant secret signalling, have a strong impact on
The security performance of the secret signalling based on chaotic laser light signal, therefore research safety enhanced chaotic secret communication system
System plays an important roll for information security.
The content of the invention
It is an object of the invention to provide a kind of enhanced chaotic secret communication system of security, time delay label can be realized
Hide, the safe class of chaotic communication system can be improved again.
To achieve the above object, the invention provides following scheme：
A kind of transmitting terminal of secret signalling, the transmitting terminal adds including main laser, main laser exocoel and information
Close module, the main laser exocoel has feedback cavity, and the laser that the main laser sends after the feedback cavity by forming
Backfeed loop, makes the main laser be operated in chaos state, and High speed phase modulators are provided with the backfeed loop, described
Phase-modulator carries out phase-modulation to the light in backfeed loop according to phase key, and the phase key is pseudo-random sequence,
The chaotic laser light signal that the main laser for being operated in chaos state sends is launched by described information encrypting module.
Optionally, the quantity of the feedback cavity for multiple, the light that the main laser sends be optically coupled device be divided into it is identical
Multichannel light, the way of the light is identical with the number of the feedback cavity.
Optionally, the phase key in each backfeed loop is separate.
Optionally, described information encrypting module includes modulator, and the modulator is used for secret signal modulation described in
On chaotic laser light signal.
Optionally, the first optical circulator, the first photo-coupler, the second photo-coupler are also included in the main laser exocoel
With the 3rd photo-coupler, the laser that the laser sends is by first optical circulator derivation, first optical circulator
Output end and first photo-coupler input light connects, the output end of first photo-coupler is respectively with described
The input of two photo-couplers, the input light connects of described information encrypting module, described information encrypting module is by after encryption
Chaotic carrier signal is launched, and the output end output two-way identical laser of second photo-coupler, the two-way is identical
Laser be first via laser and the second road laser, the first via laser by after the first feedback cavity into first phase adjust
Device processed, second road laser by after the second feedback cavity enter second phase modulator, the first phase modulator it is defeated
Go out end, the second phase modulator output end with the input light connects of the 3rd photo-coupler, the 3rd light
The input light connects of the output end of coupler and first optical circulator, first optical circulator will be input into described first
The light of optical circulator is imported inside main laser.
A kind of receiving terminal of secret signalling, the receiving terminal is included from laser, from laser external cavity, photo-coupler
And information deciphering module, described that there is feedback cavity from laser external cavity, the chaotic carrier signal that the photo-coupler will be received
It is divided into first via optical signal and the second road optical signal, it is described to have and transmitting terminal identical feedback cavity and phase-modulation from laser
Device, the laser sent from laser is set by forming backfeed loop after the feedback cavity in the backfeed loop
State phase-modulator, the laser by after the phase-modulator, entered into together with the first via optical signal it is described from
In laser, make from laser works in chaos state, produce the chaotic signal synchronous with the chaotic carrier signal, it is described mixed
Ignorant signal injects the input of described information deciphering module with second road optical signal, by described information deciphering module
Secret signal is exported after decryption, the phase-modulator in the backfeed loop carries out phase perturbation using phase key to laser,
The phase key is pseudo-random sequence, the phase key in the backfeed loop and corresponding feedback in the transmitting terminal
Phase key in loop is identical.
Optionally, the quantity of the feedback cavity for multiple, the light sent from laser be optically coupled device be divided into it is identical
Multichannel light, the way of the light is identical with the number of the feedback cavity.
Optionally, the phase key in each backfeed loop is separate.
Optionally, described information deciphering module includes demodulator, and the demodulator is used for secret signal from the chaos
Separated on laser signal.
Optionally, it is described also to include the second optical circulator, the 4th photo-coupler, the 5th optical coupling from laser external cavity
Device, the 6th photo-coupler, the first via optical signal inject the input of the 6th photo-coupler, the 6th photo-coupler
Output end, the output end light connects of fourth phase-modulator of the input also with the third phase modulator, it is described
The input light connects of the output end of the 6th photo-coupler and second optical circulator, second optical circulator will be input into
Laser imports described from inside laser, the input of the third phase modulator, the input of the 4th phase-modulator
End with the output end light connects of the 5th photo-coupler, the laser sent from laser is by second light annular
Device is derived, and is injected into the input of the 4th photo-coupler, and the output end of the 4th photo-coupler is respectively with the described 5th
The input of photo-coupler, the input light connects of information deciphering module, the output end output two-way of the 5th photo-coupler
Identical laser, the two-way identical laser is the 3rd road laser and the 4th road laser, and the 3rd road laser is by the
Into the input of third phase modulator after three feedback cavities, the 4th road laser is by entering the 4th phase after the 4th feedback cavity
The input of position modulator.According to the specific embodiment that the present invention is provided, the invention discloses following technique effect：The present invention is carried
Go out a kind of enhanced chaotic secret communication system of security, can realize that time delay label is hidden, chaotic communication system can be improved again
Safe class.In the present invention using the semiconductor laser with high-speed phase modulation and double feedback external cavity as chaos light
Source, realizes a kind of enhanced chaotic secret communication system of reliable security.High-speed phase is modulated and double feedback external cavity, can be with
The complexity of chaotic carrier is improved, hiding for time delay label is realized, time delay label has been cut off and laser external cavity structure is divulged a secret；
Phase information is also used as the key of system simultaneously, and the symmetry operation condition to closed loop chaotic secret communication system is added
It is close.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the transmitting terminal of embodiment of the present invention secret signalling and the structural representation of receiving terminal；
Fig. 2 is ACF the and DMI curves of the chaotic signal of traditional list feedback external cavity semiconductor laser output；
Fig. 3 is the transmission information schematic diagram that legitimate receipt end decrypts；
Fig. 4 is the decoding information schematic diagram obtained by the person of stealing secret information is attacked system using direct filter method；
Fig. 5 be inject using open loop structure-locking synchronization attacks the information schematic diagram that method is decoded；
Fig. 6 by under delay of feedback mismatch condition the person of stealing secret information inject-locking synchronization attacks the information decoded and illustrates
Figure；
Fig. 7 is that the person of stealing secret information carries out injecting-the decoded information of locking synchronization attack under the conditions of being unaware of phase key completely
Schematic diagram；
Fig. 8 is that the person of stealing secret information carries out injecting-the decoded information of locking synchronization attack under the conditions of being unaware of first phase key
Schematic diagram；
Fig. 9 is that the person of stealing secret information carries out injecting-the decoded information of locking synchronization attack under the conditions of being unaware of second phase key
Schematic diagram.
1st, main laser, 2, main laser exocoel, 3, information encrypting module, 4, optical fiber, 5, erbium-doped fiber amplifier, 6, light
Coupler, 7, from laser, 8, information deciphering module, 9, from laser external cavity, the 201, first optical circulator, the 202, first optocoupler
Clutch, the 203, second photo-coupler, 204, second phase modulator, 205 second phase keys, 206, first phase key,
207th, first phase modulator, the 208, the 3rd photo-coupler, 209, first via laser, the 210, second road laser, 301, modulator,
302nd, secret signal, 801, demodulator, the 901, second optical circulator, the 902, the 4th photo-coupler, the 903, the 5th photo-coupler,
904th, the 4th phase-modulator, the 905, the 4th phase key, 906, third phase key, 907, third phase modulator, 908,
6th photo-coupler.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
It is an object of the invention to provide a kind of enhanced chaotic secret communication system of security, time delay label can be realized
Hide, the safe class of chaotic communication system can be improved again.
It is below in conjunction with the accompanying drawings and specific real to enable the above objects, features and advantages of the present invention more obvious understandable
The present invention is further detailed explanation to apply mode.
Fig. 1 for embodiment of the present invention secret signalling transmitting terminal and receiving terminal structural representation, as shown in figure 1,
A kind of transmitting terminal of secret signalling, transmitting terminal includes main laser 1, information encrypting module 3, the exocoel of the main laser
2 have two feedback cavities, and the laser that the main laser 1 sends is by forming backfeed loop, the feedback after the feedback cavity
Phase-modulator is provided with loop, the laser is by returning to the main laser after the phase-modulation of the phase-modulator
In device 1, the main laser 1 is set to enter chaos working condition, the chaos that the main laser 1 for being operated in chaos state sends
Laser signal is launched by described information encrypting module 3, and the phase-modulator is using phase key in backfeed loop
Light carry out high-speed phase modulation, the phase key is the phase shift sequence applied in the backfeed loop, and the phase is close
Key is pseudo-random sequence.
The quantity of feedback cavity can be multiple, and the light that the main laser sends is optically coupled device and is divided into identical multichannel light
Line, the way of light is identical with the quantity of the feedback cavity, and phase-modulator is both provided with each backfeed loop, and each phase is adjusted
Utensil processed has the phase key of oneself, and the phase key of each phase-modulator is separate.
Information encrypting module 3 includes modulator 301, for secret signal 302 to be modulated into the chaotic laser light signal.
Also include the first optical circulator 201, the first photo-coupler 202, the second photo-coupler 203 in main laser exocoel 2
With the 3rd photo-coupler 204, the laser that the main laser 1 sends derived by the first optical circulator 201, the first optical circulator
The input light connects of 201 output end and the first photo-coupler 202, the output end of the first photo-coupler 202 is respectively with second
The input of photo-coupler 203, the input light connects of information encrypting module 3, information encrypting module 3 carry the chaos after encryption
Ripple signal is launched, the output end output two-way identical laser of the second photo-coupler 203, and the two-way identical laser is
The road laser 210 of first via laser 209 and second, first via laser 209 into first phase after the first feedback cavity by modulating
Device 207, second road laser 210 is by entering second phase modulator 204, first phase modulator after the second feedback cavity
207 output end, the output end of second phase modulator 204 with the input light connects of the 3rd photo-coupler 208, the 3rd light
The input light connects of the output end of coupler 208 and the first optical circulator 201, first optical circulator 201 will be input into institute
The light for stating the first optical circulator is imported in main laser 1.
From information encrypting module output chaotic carrier signal by after optical fiber 4, erbium-doped fiber amplifier 5, into reception
End, the receiving terminal of the secret signalling that the present invention is provided is included from laser 7, photo-coupler 6 and information deciphering module 8, institute
Stating from the exocoel 9 of laser has a feedback cavity, the chaotic carrier signal that photo-coupler 6 will be received be divided into first via optical signal and
Second road optical signal, have with transmitting terminal identical feedback cavity, phase-modulator from the exocoel 9 of laser etc., it is described from laser
The laser that device sends is provided with the phase-modulator by forming backfeed loop after the feedback cavity in the backfeed loop,
The laser is described from laser by after the phase-modulator, being returned to together with the first via optical signal, make from
Laser is in chaos working condition, produces the chaotic signal synchronous with the chaotic carrier signal, this chaotic signal and second
Road optical signal injects the input of information deciphering module 8, by exporting secret signal after the decryption of information deciphering module 8, instead
The phase-modulator being fed back in road carries out phase perturbation to the first via optical signal using phase key, and the phase key is
Pseudo-random sequence, the phase key in the backfeed loop is close with the phase in corresponding backfeed loop in the transmitting terminal
Key is identical.
There are multiple feedback cavities from the exocoel of laser, the light sent from laser be optically coupled device be divided into phase multichannel with
Light, the way of light is identical with the number of the feedback cavity from laser external cavity.Phase key in each backfeed loop is mutually only
It is vertical.Information deciphering module 8 includes demodulator 801, for secret signal to be separated from the chaotic laser light signal.
From laser external cavity also include the second optical circulator 901, the 4th photo-coupler 902, the 5th photo-coupler 903,
6th photo-coupler 908, first via optical signal injects the input of the 6th photo-coupler 908, the input of the 6th photo-coupler 908
Hold output end, the output end light connects of the 4th phase-modulator 904 also with third phase modulator 907, the 6th photo-coupler
The input light connects of 908 output end and the second optical circulator 901, the laser that the second optical circulator 901 will be input into import from
In laser 7, the input of third phase modulator 907, the 4th phase-modulator 904 input with the 5th photo-coupler
903 output end light connects, the laser sent from laser 7 is derived by the second optical circulator 901, is injected into the 4th optical coupling
The input of device 902, the output end of the 4th photo-coupler 902 input, information decryption mould respectively with the 5th photo-coupler 903
The input light connects of block 8, the output end of the 5th photo-coupler 903 exports two-way identical laser, and two-way identical laser is
3rd road laser and the 4th road laser, the 3rd road laser is by entering third phase modulator 901 after the 3rd feedback cavity
Input, the 4th road laser by after the 4th feedback cavity into the 4th phase-modulator 904 input.
Feedback intensity and modulation rate that transmitting terminal passes through appropriate regulation laser, in double feedbacks and high-speed phase modulation
(phase bit encryption：All the way in feedback light path, phase shift disturbance is added according to first phase key Key1, in addition feedback light path root all the way
According to second phase key Key2 addition phase shift disturb) under the conditions of main laser produce the repressed chaotic signal of time delay label.
The time delay label of chaotic signal can by auto-correlation function (auto-correlation function, ACF) and
Mutual information (delayed mutual information, DMI) is observed.(we define time delay label for auto-correlation function
With postpone mutual information non-zero lag time peak-peak)：
Wherein S (t) is the sequence of intensity or phase sequence of system, and Δ t is lag time, and p [S (t)] is general for S's (t)
Rate density, and p [S (t), S (t+ Δs t)] it is S (t) and the S (joint probability densities of t+ Δs t).Because time delay label in chaos system
It is as caused by delay of feedback fixed in feedback light path, and near delay of feedback, thus semiconductor laser
Outer chamber size can by detecting that time delay label is decoded, and then be attack chaotic secret communication system provides convenient.
On the other hand, by the way of chaotic modulation, its mathematical description is for information encryption in the present invention：
Wherein SMIt is the chaos light signal strength of main laser output, m (t) is source information, and A is modulation index, to ensure
Information is effectively hidden in chaotic signal, and the value of A is generally less than 10%.
Receiving terminal is divided into two parts, one by the chaos optical signal (chaotic carrier+information) that photo-coupler OC will be connected to
Dispensing enters from laser (have and the double outer-cavity structures of main laser identical and phase-modulator from laser).Symmetrically grasping
Make (with transmitting terminal identical feedback condition and phase-modulation condition) and injection locking-up effect in the presence of, from laser produce and
The synchronous chaos optical signal of main laser carrier signal, and derived for chaos decryption by circulator CIR.The number of chaos decryption
Be described as：
M ' (t)=LPF | Str|2-|SS|2} (4)
StrFor the modulated chaos optical carrier intensity that receiving terminal is received；SsFor the synchronous chaos signal that SSL is produced is strong
Degree；LPF is LPF, for filtering off noise and HFS to decrypting the influence of performance.
A specific embodiment is given below to be further described the present invention.In system, main laser with from laser
Operation wavelength for 1550nm, first phase key Key1 and second phase key Key2 be two independent 128-bit it is pseudo- with
Machine sequence, the modulation rate of backfeed loop 1 is 20Gps, and the modulation rate in loop 2 is 21Gbps.Other systematic parameters are：It is main to swash
Light device is 22.05mA with the operating current from laser；The feedback intensity of the feedback control loop 1 of main laser and time delay are distinguished
It is 6ns-1 and 2ns, the feedback intensity of feedback control loop 2 and time delay are respectively 6ns-1 and 3ns, from the feedback intensity of laser
It is identical with time delay with main laser；It is 100ns-1 that main laser is injected into from the intensity of laser, and optical fiber link length is
60km, the modulation depth of information is A=0.05.The symmetrical phase key random sequence used in emulation is produced at random by Matlab
It is raw.In the above operating condition, main laser and the chaotic signal high level of synchronization from laser output.It is right in order to verify the present invention
The enhancing ability of information transfer confidentiality, we are simulated to system using two kinds of attack patterns and attacked, and one kind is linear filter
Ripple method, one kind is injection-locking synchronization method.The concrete operations of linear filtering method are equal to the low pass of information rate using cut-off frequency
Wave filter directly filters the chaos optical signal of intercepting and capturing, mainly hiding performance of the inspection chaotic carrier to information.Injection-locking is same
Step attack method refers to link chaotic signal that the person of stealing secret information will intercept by being injected into after amplification with main laser and from laser
In similar laser SSLE, by realizing SSLE and intercepting and capturing the synchronous of chaotic carrier, then the information as described in formula (4) is carried out
Decryption.
Fig. 2 is ACF the and DMI curves of the chaotic signal of traditional list feedback external cavity semiconductor laser output.Such as Fig. 2 institutes
Show, figure (a1) and (b1) represents that delay of feedback is 2ns respectively, and feedback intensity is 12ns-1Single feedback external cavity semiconductor laser
Export ACF the and DMA curves of chaotic signal；Figure (a2) and (b2) represents that delay of feedback is 3ns respectively, and feedback intensity is 12ns-1
Single feedback external cavity semiconductor laser export chaotic signal ACF and DMA curves；Figure (a3) and (b3) represents band high-speed phase
The double feedback main lasers of modulation export ACF the and DMA curves of chaotic signal；As can be seen that with traditional list feedback external cavity chaos partly
Conductor laser is compared, the time delay of the chaotic signal that the semiconductor laser main laser with the double feedbacks of high-speed phase modulation is produced
Label is eliminated.This feature avoids the person of stealing secret information and detects time delay label from the chaotic signal intercepted and captured, and then carries out mathematics
Model or build the possibility of same exocoel chaos semiconductor laser.Chaos laser structure is inherently reduced to let out
The risk of dew, improves the security of system.
Fig. 3 is the transmission information schematic diagram that legitimate receipt end decrypts, as shown in figure 3, first phase key Key1 (modulation
Speed 20Gbps) and second phase key Key2 (modulation rate 21Gbps) be backfeed loop applied in phase shift sequence, be
The phase key of system, wherein with the corresponding phase shift π of code element 1, the correspondence phase shift 0 of code element 0 is (conversely, the corresponding phase shift of code element 1 can also be used
0, the corresponding phase shift π of code element 0).The rate of information throughput of system is 4Gbps, it can be seen that be hidden in the transmission letter in chaotic signal
Breath is successfully demodulated.
Fig. 4 is the decoding information schematic diagram obtained by the person of stealing secret information is attacked system using direct filter method, and legal
Communication is compared, and the person of stealing secret information can not obtain correct information, and information can be good at being hidden in chaotic signal in illustrating the present invention.
Fig. 5 be inject using open loop structure-locking synchronization attacks the information schematic diagram that method is decoded.The person of stealing secret information is unknown
In the case of time delay label, inject using open loop structure-locking synchronization attacks the information that method is decoded, as a result show, i.e.,
Make using the semiconductor laser as from laser (SSL), the person of stealing secret information can not successfully decrypt transmission information.
Fig. 6 by under delay of feedback mismatch condition the person of stealing secret information inject-locking synchronization attacks the information that method decodes and shows
It is intended to, as shown in fig. 6, the person of stealing secret information knows phase key (first phase key key1 and second phase key key2), but structure
The ECLD built from legitimate receipt end with different delay of feedback (being not authorized to true time delay), carry out
Injection-locking synchronization attacks the information that method is decoded.Result shows, even if using the semiconductor laser (exocoel as SSL
It is different), and known phase key, the difference of laser external cavity structure can also cause that the person of stealing secret information can not successfully decrypt
Transmission information.
Fig. 7 be unaware of completely the person of stealing secret information under the conditions of phase key inject-locking synchronization attacks decoded letter and shows
It is intended to.The person of stealing secret information knowing time delay label, and construct with legitimate receipt end identical double feedback external cavity semiconductor laser but
It is that (key A of the person that i.e. do not steal secret information is different from first phase key of the invention, and the person's of stealing secret information is close in the case of not knowing phase key
Key B is also different from second phase key of the invention), carry out injecting-the decoded letter of locking synchronization attack.Result shows, such as
Without correct phase key, the time delay label that the person that even do not steal secret information has stolen system still can not decrypt correct letter to fruit
Breath.
Fig. 8 is that the person of stealing secret information synchronizes the decoded information schematic diagram of attack under the conditions of being unaware of first phase key.Surreptitiously
That is, close person knows phase key in time delay label and feedback light path 1, the key A of the person that do not steal secret information and first phase key phase of the invention
Together, but the key B of the person of stealing secret information is different from second phase key of the invention, and build outer with the double feedbacks of legitimate receipt end identical
Cavity semiconductor laser is synchronized attacks decoded information.Result shows, similar to Fig. 7, and the person of stealing secret information can not recover
Correct information.
Fig. 9 is that the person of stealing secret information synchronizes the decoded information schematic diagram of attack under the conditions of being unaware of second phase key.Surreptitiously
Close person knows phase key in time delay label and feedback light path 2, that is, the key A of the person that do not steal secret information is with first phase key of the invention not
Together, the key B of the person of stealing secret information is identical with second phase key of the invention, and builds and legitimate receipt end identical double feedback external cavity
Semiconductor laser is synchronized attacks decoded information.Result shows, as Fig. 7, the person of stealing secret information can not recover correctly
Information.
The result of Fig. 5-Fig. 9 shows that the person of stealing secret information is before accurate time delay label and random phase key is not exclusively grasped
Put, it is impossible to decrypt correct information, illustrate that Information Security of the invention is strengthened.
The system that the present invention is provided can improve the complexity of chaotic carrier and unpredictable using double feedbacks (feeding back more)
Characteristic, improves crypticity of the information in chaotic carrier；The system can effectively suppress the time delay label of chaotic carrier signal,
Improve the security in chaotic carrier source；Traditional symmetric cryptosystem is applied to chaotic secret communication system and improves system
Anti-intercepting and capturing performance.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Specific case used herein is set forth to principle of the invention and implementation method, and above example is said
It is bright to be only intended to help and understand the method for the present invention and its core concept；Simultaneously for those of ordinary skill in the art, foundation
Thought of the invention, will change in specific embodiments and applications.In sum, this specification content is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of transmitting terminal of secret signalling, it is characterised in that the transmitting terminal includes main laser, main laser exocoel
And information encrypting module, the main laser exocoel has feedback cavity, and the laser that the main laser sends is by the feedback
Backfeed loop is formed behind chamber, the main laser is operated in chaos state, high-speed phase tune is provided with the backfeed loop
Device processed, the phase-modulator carries out phase-modulation to the light in backfeed loop according to phase key, and the phase key is puppet
Random sequence, the chaotic laser light signal that the main laser for being operated in chaos state sends is sent out by described information encrypting module
It is shot out.
2. transmitting terminal according to claim 1, it is characterised in that the quantity of the feedback cavity is multiple, the main laser
The light that device sends is optically coupled device and is divided into identical multichannel light, and the way of the light is identical with the number of the feedback cavity.
3. transmitting terminal according to claim 2, it is characterised in that the phase key in each backfeed loop is separate.
4. transmitting terminal according to claim 1, it is characterised in that described information encrypting module includes modulator, the tune
Device processed is used for secret signal modulation to the chaotic laser light signal.
5. the transmitting terminal according to Claims 2 or 3, it is characterised in that also include the first light in the main laser exocoel
Circulator, the first photo-coupler, the second photo-coupler and the 3rd photo-coupler, the laser that the laser sends is by described the
One optical circulator is derived, the input light connects of the output end of first optical circulator and first photo-coupler, described
The output end of the first photo-coupler input, the input light of described information encrypting module respectively with second photo-coupler
Connection, described information encrypting module launches the chaotic carrier signal after encryption, the output end of second photo-coupler
Output two-way identical laser, the two-way identical laser is first via laser and the second road laser, the first via laser
By entering first phase modulator after the first feedback cavity, second road laser is by entering the second phase after the second feedback cavity
Position modulator, the output end of the first phase modulator, the output end of the second phase modulator with the 3rd light
The input light connects of coupler, the output end of the 3rd photo-coupler connects with the input light of first optical circulator
Connect, first optical circulator is imported the light of first optical circulator is input into inside main laser.
6. a kind of receiving terminal of secret signalling, it is characterised in that the receiving terminal is included from laser, from outside laser
Chamber, photo-coupler and information deciphering module, described to have feedback cavity from laser external cavity, the photo-coupler is mixed by what is received
Ignorant carrier signal is divided into first via optical signal and the second road optical signal, described to have and transmitting terminal identical feedback cavity from laser
And phase-modulator, the laser sent from laser is by forming backfeed loop, the backfeed loop after the feedback cavity
In be provided with the phase-modulator, the laser together with the first via optical signal by after the phase-modulator, entering
Enter to described from laser, make from laser works in chaos state, produce the chaos synchronous with the chaotic carrier signal
Signal, the chaotic signal injects the input of described information deciphering module with second road optical signal, by the letter
Secret signal is exported after the decryption for ceasing deciphering module, the phase-modulator in the backfeed loop is entered using phase key to laser
Line phase is disturbed, and the phase key is pseudo-random sequence, the phase key and the transmitting terminal in the backfeed loop
In phase key in corresponding backfeed loop it is identical.
7. receiving terminal according to claim 6, it is characterised in that the quantity of the feedback cavity is multiple, described from laser
The light that device sends is optically coupled device and is divided into identical multichannel light, and the way of the light is identical with the number of the feedback cavity.
8. transmitting terminal according to claim 7, it is characterised in that the phase key in each backfeed loop is separate.
9. transmitting terminal according to claim 1, it is characterised in that described information deciphering module includes demodulator, the solution
Adjusting device is used to separate secret signal from the chaotic laser light signal.
10. the receiving terminal according to claim 6 or 7, it is characterised in that described also to include the second light from laser external cavity
Circulator, the 4th photo-coupler, the 5th photo-coupler, the 6th photo-coupler, the first via optical signal inject the 6th light
The input of coupler, output end, described of the input of the 6th photo-coupler also with the third phase modulator
The output end light connects of four phase-modulators, the output end of the 6th photo-coupler and the input of second optical circulator
Light connects, the laser importing that second optical circulator will be input into is described from inside laser, the third phase modulator
Input, the 4th phase-modulator input with the output end light connects of the 5th photo-coupler, it is described from swash
The laser that light device sends is derived by second optical circulator, is injected into the input of the 4th photo-coupler, and described the
The output end of four photo-couplers input, the input light connects of information deciphering module respectively with the 5th photo-coupler,
The output end output two-way identical laser of the 5th photo-coupler, the two-way identical laser is the 3rd road laser and the
Four road laser, the 3rd road laser is by the input after the 3rd feedback cavity into third phase modulator, the described 4th
Road laser is by the input after the 4th feedback cavity into the 4th phase-modulator.
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| CN111147145A (en) * | 2019-12-06 | 2020-05-12 | 太原理工大学 | Large-key space chaotic optical communication transceiver |
| CN111147145B (en) * | 2019-12-06 | 2022-05-13 | 太原理工大学 | Large-key space chaotic optical communication transceiver |
| CN111431566A (en) * | 2020-03-20 | 2020-07-17 | 哈尔滨工业大学 | Multi-path optical signal fast search method applied to atmosphere laser communication spatial modulation system |
| CN111934844A (en) * | 2020-07-03 | 2020-11-13 | 太原理工大学 | Chaotic synchronous secret communication system and method based on double closed-loop feedback reserve pool calculation |
| CN111934844B (en) * | 2020-07-03 | 2022-06-07 | 太原理工大学 | Chaotic synchronous secret communication system and method based on double closed-loop feedback reserve pool calculation |
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| CN113179149A (en) * | 2021-03-12 | 2021-07-27 | 广东工业大学 | Secret optical communication system based on double-chaos phase encoding encryption |
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