CN105978679A - Transmitting end and receiving end of secure communication system - Google Patents
Transmitting end and receiving end of secure communication system Download PDFInfo
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- CN105978679A CN105978679A CN201610573673.5A CN201610573673A CN105978679A CN 105978679 A CN105978679 A CN 105978679A CN 201610573673 A CN201610573673 A CN 201610573673A CN 105978679 A CN105978679 A CN 105978679A
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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 present invention discloses a transmitting end and a receiving end of a secure communication system. The transmitting end comprises a main laser, a main laser external cavity and an information encryption module, wherein the main laser external cavity has feedback cavities, and laser light emitted by the main laser passes through the feedback cavities and then forms feedback loops, so that the main laser operates in a chaotic state. A phase modulator is arranged in each laser feedback loop, and phase modulation is conducted on light in the feedback loop by the phase modulator according to a phase key which is a pseudo-random sequence. A chaotic laser signal sent by the main laser operating in the chaotic state is transmitted by the information encryption module. A laser of the receiving end can correctly demodulate information only when having the same feedback structure and phase modulation as the main laser. Meanwhile, a multi-feedback external cavity of high-speed phase modulation can hide a time delay tag of the chaotic laser, thereby improving the security of the communication system.
Description
Technical field
The present invention relates to secret communication field, particularly relate to transmitting terminal and the reception of a kind of secret signalling
End.
Background technology
Along with computer and the high speed development of mechanics of communication, and the arrival in the Internet+epoch, opening of network
Putting property, interconnectivity, sharing expand rapidly, and the mankind are increasing to the dependency of network, the thing followed
Information security hidden danger also gets more and more, and information security has become as one of major issue of whole world care, I
" network power strategy " is clearly included in the Strategic System that " 13 " plan by 18 the fifth plenary sessions of state.
Chaotic secret communication technology is owing to can provide efficient safety of physical layer to receive significant attention, but at mesh
Front application based on chaotic communication system and research find existing secret communication based on laser chaos
There is the potential safety hazards such as the outer-cavity structure of time delay label leakage chaos semiconductor laser in system, has a strong impact on
The security performance of secret signalling based on chaotic laser light signal, the chaos that therefore research safety strengthens is protected
Close communication system has important function for information security.
Summary of the invention
It is an object of the invention to provide the chaotic secret communication system that a kind of safety strengthens, time delay can be realized
Hiding of label, can improve again the safe class of chaotic communication system.
For achieving the above object, the invention provides following scheme:
A kind of transmitting terminal of secret signalling, described transmitting terminal include main laser, main laser exocoel and
Information encrypting module, described main laser exocoel has feedback cavity, and the laser that described main laser sends passes through
Form feedback circuit after described feedback cavity, make described main laser be operated in chaos state, described feedback circuit
In be provided with High speed phase modulators, described phase-modulator enters according to the light in phase place double secret key feedback circuit
Line phase is modulated, and described phase place key is pseudo-random sequence, described in be operated in the main laser of chaos state and send out
The chaotic laser light signal gone out is launched through described information encrypting module.
Optionally, the quantity of described feedback cavity is multiple, and the light that described main laser sends is optically coupled device and divides
For identical multichannel light, the way of described light is identical with the number of described feedback cavity.
Optionally, the phase place key in each feedback circuit is separate.
Optionally, described information encrypting module includes manipulator, and described manipulator is for modulating secret signal
On described chaotic laser light signal.
Optionally, described main laser exocoel also includes the first optical circulator, the first photo-coupler, second
Photo-coupler and the 3rd photo-coupler, the laser that described laser instrument sends is led by described first optical circulator
Going out, the outfan of described first optical circulator is connected with the input light of described first photo-coupler, and described
The outfan of one photo-coupler respectively with the input of described second photo-coupler, described information encrypting module
Input light connects, and the chaotic carrier signal after encryption is launched by described information encrypting module, and described the
The outfan of two photo-couplers exports the laser that two-way is identical, and the laser that described two-way is identical is first via laser
With the second road laser, described first via laser is entering first phase manipulator, institute after the first feedback cavity
State the second road laser after the second feedback cavity, enter second phase manipulator, described first phase manipulator
Outfan, described second phase manipulator outfan all with the input light of described 3rd photo-coupler even
Connecing, the outfan of described 3rd photo-coupler is connected with the input light of described first optical circulator, and described
The light inputting described first optical circulator is imported inside main laser by one optical circulator.
A kind of receiving terminal of secret signalling, described receiving terminal include from laser instrument, from laser external cavity,
Photo-coupler and information deciphering module, described have feedback cavity from laser external cavity, and described photo-coupler will connect
The chaotic carrier signal received is divided into first via optical signal and the second road optical signal, described from laser instrument have with
Feedback cavity that transmitting terminal is identical and phase-modulator, the described laser sent from laser instrument is through described feedback cavity
Rear formation feedback circuit, is provided with described phase-modulator in described feedback circuit, described laser is through described
After phase-modulator, enter into described from laser instrument together with described first via optical signal, make from laser instrument
Be operated in chaos state, produce the chaotic signal Tong Bu with described chaotic carrier signal, described chaotic signal with
Described second road optical signal all injects the input of described information deciphering module, through described information deciphering module
Deciphering after export secret signal, phase-modulator in described feedback circuit uses phase place double secret key laser to enter
Line phase disturbance, described phase place key is pseudo-random sequence, the described phase place key in described feedback circuit with
The phase place key in feedback circuit corresponding in described transmitting terminal is identical.
Optionally, the quantity of described feedback cavity is multiple, and the described light sent from laser instrument is optically coupled device and divides
For identical multichannel light, the way of described light is identical with the number of described feedback cavity.
Optionally, the phase place key in each feedback circuit is separate.
Optionally, described information deciphering module includes demodulator, and described demodulator is used for secret signal from institute
State and separate on chaotic laser light signal.
Optionally, described also include from laser external cavity the second optical circulator, the 4th photo-coupler, the 5th
Photo-coupler, the 6th photo-coupler, described first via optical signal injects the input of described 6th photo-coupler,
The input of described 6th photo-coupler also with the outfan of described third phase manipulator, described 4th phase place
The outfan light of manipulator connects, and the outfan of described 6th photo-coupler is defeated with described second optical circulator
Entering and hold light to connect, the laser of input is imported described inside laser instrument by described second optical circulator, and described the
The input of three phase-modulators, described 4th phase-modulator input all with described 5th photo-coupler
Outfan light connect, the described laser sent from laser instrument is derived by described second optical circulator, injects
To the input of described 4th photo-coupler, the outfan of described 4th photo-coupler respectively with described 5th light
The input of bonder, the input light of information deciphering module connect, the outfan of described 5th photo-coupler
The laser that output two-way is identical, the laser that described two-way is identical is the 3rd road laser and the 4th road laser, described
3rd road laser is entering the input of third phase manipulator after the 3rd feedback cavity, and described 4th road is swashed
Light enters the input of the 4th phase-modulator after the 4th feedback cavity.The concrete reality provided according to the present invention
Execute example, the invention discloses techniques below effect: the present invention proposes the chaotic secret of a kind of safety enhancing and leads to
Communication system, can realize time delay label and hide, can improve again the safe class of chaotic communication system.At this
Bright middle employing modulates the semiconductor laser with double feedback external cavity as chaos light source with high-speed phase, it is achieved
The chaotic secret communication system that a kind of reliable safety strengthens.High-speed phase modulation and double feedback external cavity,
The complexity of chaotic carrier can be improved, it is achieved hiding of time delay label, cut off time delay label to laser instrument
Divulging a secret of outer-cavity structure；Phase information is also used as the key of system simultaneously, to closed loop chaotic secret communication
The symmetry operation condition of system is encrypted.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
On the premise of, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is transmitting terminal and the structural representation of receiving terminal of embodiment of the present invention secret signalling；
Fig. 2 is that ACF and DMI of the chaotic signal of tradition single feedback external cavity semiconductor laser output is bent
Line；
Fig. 3 is the transmission information schematic diagram that legitimate receipt end decrypts；
Fig. 4 is that the person of stealing secret information uses direct filter method that system is attacked obtained decoding information schematic diagram；
Fig. 5 by use open loop structure carry out injecting-locking synchronization attacks the information schematic diagram that method is decoded；
Fig. 6 by the person of stealing secret information under delay of feedback mismatch condition carry out injecting-locking synchronization attacks the letter decoded
Breath schematic diagram；
Fig. 7 by being unaware of the person of stealing secret information under the conditions of phase place key completely and carry out injecting-locking synchronization attacks and decoded
Information schematic diagram；
Fig. 8 by being unaware of the person of stealing secret information under the conditions of first phase key and carry out injecting-locking synchronization attacks and decoded
Information schematic diagram；
Fig. 9 by being unaware of the person of stealing secret information under the conditions of second phase key and carry out injecting-locking synchronization attacks and decoded
Information schematic diagram.
1, main laser, 2, main laser exocoel, 3, information encrypting module, 4, optical fiber, 5, er-doped
Fiber amplifier, 6, photo-coupler, 7, from laser instrument, 8, information deciphering module, 9, from laser instrument
Chamber, the 201, first optical circulator, the 202, first photo-coupler, the 203, second photo-coupler, 204,
Two phase manipulator, 205 second phase keys, 206, first phase key, 207, first phase modulation
Device, the 208, the 3rd photo-coupler, 209, first via laser, the 210, second road laser, 301, manipulator,
302, secret signal, 801, demodulator, the 901, second optical circulator, the 902, the 4th photo-coupler, 903,
5th photo-coupler, the 904, the 4th phase-modulator, the 905, the 4th phase place key, 906, third phase
Key, 907, third phase manipulator, the 908, the 6th photo-coupler.
Detailed description of the invention
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 clearly
Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
It is an object of the invention to provide the chaotic secret communication system that a kind of safety strengthens, time delay can be realized
Hiding of label, can improve again the safe class of chaotic communication system.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the accompanying drawings and
The present invention is further detailed explanation for detailed description of the invention.
Fig. 1 is transmitting terminal and the structural representation of receiving terminal of embodiment of the present invention secret signalling, such as figure
Shown in 1, the transmitting terminal of a kind of secret signalling, transmitting terminal includes main laser 1, information encrypting module
3, the exocoel 2 of described main laser has two feedback cavity, and the laser that described main laser 1 sends passes through
Form feedback circuit after described feedback cavity, described feedback circuit is provided with phase-modulator, described laser warp
Return to after crossing the phase-modulation of described phase-modulator, in described main laser 1, make described main laser 1
Enter chaos duty, described in be operated in the chaotic laser light signal warp that the main laser 1 of chaos state sends
Crossing described information encrypting module 3 to launch, described phase-modulator uses in phase place double secret key feedback circuit
Light carry out high-speed phase modulation, described phase place key be in described feedback circuit apply phase shift sequence,
Described phase place key is pseudo-random sequence.
The quantity of feedback cavity can be multiple, and the light that described main laser sends is optically coupled device and is divided into identical
Multichannel light, the way of light is identical with the quantity of described feedback cavity, is both provided with phase in each feedback circuit
Position manipulator, each phase-modulator has the phase place key of oneself, and the phase place key of each phase-modulator
Separate.
Information encrypting module 3 includes manipulator 301, swashs for secret signal 302 is modulated described chaos
On optical signal.
Main laser exocoel 2 also includes first optical circulator the 201, first photo-coupler the 202, second light
Bonder 203 and the 3rd photo-coupler 204, the laser that described main laser 1 sends is by the first light annular
Device 201 is derived, and the outfan of the first optical circulator 201 and the input light of the first photo-coupler 202 connect,
The outfan of the first photo-coupler 202 respectively with input, the information encrypting module of the second photo-coupler 203
The input light of 3 connects, and the chaotic carrier signal after encryption is launched by information encrypting module 3, and second
The outfan of photo-coupler 203 exports the laser that two-way is identical, and the laser that described two-way is identical is that the first via swashs
Light 209 and the second road laser 210, first via laser 209 is entering first phase after the first feedback cavity
Manipulator 207, described second road laser 210 enters second phase manipulator 204 after the second feedback cavity,
The outfan of first phase manipulator 207, second phase manipulator 204 outfan all with the 3rd optical coupling
The input light of device 208 connects, the outfan of the 3rd photo-coupler 208 and the first optical circulator 201 defeated
Entering and hold light to connect, the light inputting described first optical circulator is imported main laser by described first optical circulator 201
In device 1.
From the chaotic carrier signal of information encrypting module output after optical fiber 4, erbium-doped fiber amplifier 5,
Entering receiving terminal, the receiving terminal of the secret signalling that the present invention provides includes from laser instrument 7, photo-coupler
6 and information deciphering module 8, the described exocoel 9 from laser instrument has feedback cavity, and photo-coupler 6 will receive
To chaotic carrier signal be divided into first via optical signal and the second road optical signal, have from the exocoel 9 of laser instrument
The feedback cavity identical with transmitting terminal, phase-modulator etc., the described laser sent from laser instrument through described instead
Feedback forms feedback circuit behind chamber, is provided with described phase-modulator in described feedback circuit, and described laser passes through
After described phase-modulator, return to described from laser instrument together with described first via optical signal, make from swashing
Light device is in chaos duty, produces the chaotic signal Tong Bu with described chaotic carrier signal, and this chaos is believed
Number all inject the input of information deciphering module 8, through the solution of information deciphering module 8 with the second road optical signal
Exporting secret signal after close, the phase-modulator in feedback circuit uses first via light letter described in phase place double secret key
Number carrying out phase perturbation, described phase place key is pseudo-random sequence, and the described phase place in described feedback circuit is close
Phase place key in the feedback circuit that key is corresponding with described transmitting terminal is identical.
Having multiple feedback cavity from the exocoel of laser instrument, the light sent from laser instrument is optically coupled device and is divided into the most
The light that road is same, the way of light is identical with the number of the feedback cavity from laser external cavity.In each feedback circuit
Phase place key separate.Information deciphering module 8 includes demodulator 801, is used for secret signal from institute
State and separate on chaotic laser light signal.
The second optical circulator the 901, the 4th photo-coupler the 902, the 5th optocoupler is also included from laser external cavity
Clutch the 903, the 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 also with outfan, the 4th phase-modulation of third phase manipulator 907
The outfan light of device 904 connects, the outfan of the 6th photo-coupler 908 and the second optical circulator 901 defeated
Entering and hold light to connect, the laser of input is imported in laser instrument 7 by the second optical circulator 901, and third phase is adjusted
The input of device 907 processed, input all defeated with the 5th photo-coupler 903 of the 4th phase-modulator 904
Going out and hold light to connect, the laser sent from laser instrument 7 is derived by the second optical circulator 901, is injected into the 4th
The input of photo-coupler 902, the outfan of the 4th photo-coupler 902 respectively with the 5th photo-coupler 903
Input, the input light of information deciphering module 8 connect, the output of the outfan of the 5th photo-coupler 903
The laser that two-way is identical, the laser that two-way is identical is the 3rd road laser and the 4th road laser, and described 3rd road is swashed
Light is entering the input of third phase manipulator 901, described 4th road laser warp after the 3rd feedback cavity
The input of the 4th phase-modulator 904 is entered after crossing the 4th feedback cavity.
Transmitting terminal is by suitably regulating feedback intensity and the modulation rate of laser instrument, at double feedbacks and high-speed phase
Modulation (phase bit encryption: in a road feedback light path, adds phase shift disturbance according to first phase key Key1,
An other road feedback light path according to second phase key Key2 add phase shift disturbance) under the conditions of main laser produce
The raw repressed chaotic signal of time delay label.
The time delay label of chaotic signal can pass through auto-correlation function (auto-correlation function, ACF)
Observe with mutual information (delayed mutual information, DMI).(we define time delay label
For auto-correlation function and postpone mutual information in the peak-peak of non-zero lag time):
Wherein S (t) is sequence of intensity or the phase sequence of system, and Δ t is lag time, and p [S (t)] is S (t)
Probability density, p [S (t), S (t+ Δ t)] is S (t) and the S (joint probability density of t+ Δ t).Because chaos system
Middle time delay label is by caused by delay of feedback fixing in feedback light path, and it is attached to be positioned at delay of feedback
Closely, thus the exocoel size of semiconductor laser can be decoded by detection time delay label, and then mixed for attacking
Ignorant secret signalling provides convenient.
On the other hand, information encryption in the present invention uses the mode of chaotic modulation, and its mathematical description is:
Wherein SMFor the chaos light signal strength of main laser output, m (t) is source information, and A is modulation index,
Effectively being hidden in chaotic signal for guarantee information, the value of A is generally less than 10%.
The chaos optical signal (chaotic carrier+information) received is divided into two by photo-coupler OC by receiving terminal
Point, a part is injected and (is had the double outer-cavity structures identical with main laser and phase from laser instrument from laser instrument
Position manipulator).In symmetry operation (feedback condition identical with transmitting terminal and phase-modulation condition) and injection locking
Under the effect of effect, produce the chaos optical signal Tong Bu with main laser carrier signal from laser instrument, and pass through
Circulator CIR derives and deciphers for chaos.The mathematical description of chaos deciphering is:
M ' (t)=LPF{ | Str|2-|SS|2} (4)
StrThe modulated chaos optical carrier intensity received for receiving terminal；SsThe synchronization produced for SSL mixes
Ignorant signal intensity；LPF is low-pass filtering, for filtering off the impact on deciphering performance of noise and HFS.
A specific embodiment is given below the present invention is further described.In system, main laser with from
The operation wavelength of laser instrument is 1550nm, and first phase key Key1 and second phase key Key2 is two
Individual independent 128-bit pseudo-random sequence, the modulation rate of feedback circuit 1 is 20Gps, the tune in loop 2
Speed processed is 21Gbps.Other systematic parameter is: main laser is 22.05 with the operating current from laser instrument
mA；The feedback intensity of the feedback control loop 1 of main laser and be respectively 6ns-1 and 2ns time delay, feedback
Feedback intensity and the time delay of loop 2 are respectively 6ns-1 and 3ns, from the feedback intensity of laser instrument and prolonging
Time is identical with main laser late；Main laser be injected into from the intensity of laser instrument be 100ns-1, optical fiber chain
The a length of 60km in road, the modulation depth of information is A=0.05.The symmetrical phase key used in emulation is random
Sequence is randomly generated by Matlab.In the above operating condition, main laser and mixing from laser instrument output
Ignorant signal height synchronizes.In order to verify the present invention enhancing ability to information transmission security, we use two
Planting attack pattern to be simulated attacking to system, one is linear filtering method, a kind of for injection-locking synchronization
Method.The concrete operations of linear filtering method use cut-off frequency directly to filter equal to the low pass filter of information rate
The chaos optical signal intercepted and captured, mainly the inspection chaotic carrier hiding performance to information.Injection-locking synchronization
Attack method refers to, the person of stealing secret information by the link chaotic signal intercepted by amplify after be injected into main laser and
From the laser instrument SSLE that laser instrument is similar, synchronization with intercept and capture chaotic carrier by realizing SSLE, then
Carry out the information deciphering as described in formula (4).
Fig. 2 is that ACF and DMI of the chaotic signal of tradition single feedback external cavity semiconductor laser output is bent
Line.As in figure 2 it is shown, figure (a1) and (b1) represents that delay of feedback is 2ns respectively, feedback intensity is 12ns-1
Single feedback external cavity semiconductor laser output chaotic signal ACF and DMA curve；Figure (a2) and (b2)
Representing that delay of feedback is 3ns respectively, feedback intensity is 12ns-1Single feedback external cavity semiconductor laser output
ACF and the DMA curve of chaotic signal；Figure (a3) and (b3) represents that the double feedback of band high-speed phase modulation is main and swashs
ACF and the DMA curve of light device output chaotic signal；It can be seen that with tradition list feedback external cavity chaos
Semiconductor laser is compared, and it is mixed that the semiconductor laser main laser of the double feedback of band high-speed phase modulation produces
The time delay label of ignorant signal is eliminated.This feature avoids the person of stealing secret information and detects from the chaotic signal intercepted and captured
Time delay label, and then carry out mathematical modeling or build the possibility of same exocoel chaos semiconductor laser
Property.Inherently reduce the risk that chaos laser structure is revealed, improve the safety of system.
Fig. 3 is the transmission information schematic diagram that legitimate receipt end decrypts, as it is shown on figure 3, first phase key
Key1 (modulation rate 20Gbps) and second phase key Key2 (modulation rate 21Gbps) are feedback
Phase shift sequence applied in loop, is the phase place key of system, wherein with the corresponding phase shift π of code element 1, code
The corresponding phase shift of unit 00 (contrary, it is also possible to by the corresponding phase shift 0 of code element 1, the corresponding phase shift π of code element 0).System
The rate of information throughput of system is 4Gbps, it can be seen that the transmission information being hidden in chaotic signal is by successfully
Demodulation is out.
Fig. 4 is that the person of stealing secret information uses direct filter method that system is attacked obtained decoding information schematic diagram,
Compared with legitimate correspondence, the person of stealing secret information can not obtain correct information, illustrates that in the present invention, information can be good at hidden
Ensconce in chaotic signal.
Fig. 5 by use open loop structure carry out injecting-locking synchronization attacks the information schematic diagram that method is decoded.Steal
In the case of close person's the unknown time delay label, use open loop structure carry out injecting-locking synchronization attacks method and decoded
Information, result shows, even if using the semiconductor laser the same with from laser instrument (SSL), steals secret information
Person can not successfully decrypt transmission information.
Fig. 6 by the person of stealing secret information under delay of feedback mismatch condition carry out injecting-locking synchronization attacks what method was decoded
Information schematic diagram, as shown in Figure 6, the person of stealing secret information knows phase place key (first phase key key1 and second
Phase place key key2), but the ECLD built is different from having of legitimate receipt end
Delay of feedback (is not authorized to true time delay), carry out injecting-locking synchronization attacks the information that method is decoded.Knot
Fruit shows, even if using the semiconductor laser (exocoel different) the same with SSL, and has known phase place
Key, the difference of laser external cavity structure also can make the person of stealing secret information can not successfully decrypt transmission information.
Fig. 7 by being unaware of the person of stealing secret information under the conditions of phase place key completely and carry out injecting-locking synchronization attacks and decoded
Letter schematic diagram.The person of stealing secret information is knowing time delay label, and constructs outside double feedbacks identical with legitimate receipt end
Cavity semiconductor laser but (key A of the person that i.e. do not steals secret information and the present invention in the case of not knowing phase place key
First phase key different, the key B of the person of stealing secret information is the most different from the second phase key of the present invention), enter
Row injection-locking synchronization attacks the letter decoded.Result shows, without correct phase place key, i.e.
It is that the person of stealing secret information has stolen the time delay label of system and still can not decrypt correct information.
Fig. 8 carries out the information that synchronization attack decoded show by being unaware of the person of stealing secret information under the conditions of first phase key
It is intended to.The person of stealing secret information knows phase place key in time delay label and feedback light path 1, the key A of the person that i.e. do not steals secret information with
The first phase key of the present invention is identical, but the second phase key of the key B of the person of stealing secret information and the present invention is not
With, and build the double feedback external cavity semiconductor laser identical with legitimate receipt end and carry out synchronization attack and decoded
Information.Result shows, similar to Fig. 7, and the person of stealing secret information can not recover correct information.
Fig. 9 carries out the information that synchronization attack decoded show by being unaware of the person of stealing secret information under the conditions of second phase key
It is intended to.The person of stealing secret information knows phase place key in time delay label and feedback light path 2, the key A of the person that i.e. do not steals secret information with
The first phase key of the present invention is different, and the key B of the person of stealing secret information is identical with the second phase key of the present invention,
And the structure double feedback external cavity semiconductor laser identical with legitimate receipt end carries out what synchronization attack was decoded
Information.Result shows, as Fig. 7, the person of stealing secret information can not recover correct information.
The result of Fig. 5-Fig. 9 shows, the person of stealing secret information is not exclusively to grasp time delay label and random phase accurately close
On the premise of key, it is impossible to decrypt correct information, illustrate that the Information Security of the present invention is strengthened.
The system that the present invention provides uses double feedback (feeding back) can improve the complexity and not of chaotic carrier more
Measurable characteristic, the information that improves crypticity in chaotic carrier；This system can effectively suppress chaos to carry
The time delay label of ripple signal, improves the safety in chaotic carrier source；By traditional symmetric cryptosystem application
The Anti TBIgG performance of system is improve in chaotic secret communication system.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is
With the difference of other embodiments, between each embodiment, identical similar portion sees mutually.For
For system disclosed in embodiment, owing to it corresponds to the method disclosed in Example, so the comparison described
Simply, relevant part sees method part and illustrates.
Principle and the embodiment of the present invention are set forth by specific case used herein, above enforcement
The explanation of example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for this area
Those skilled in the art, according to the thought of the present invention, the most all can change
Part.In sum, this specification content should not be construed as limitation of the present invention.
Claims (10)
1. the transmitting terminal of a secret signalling, it is characterised in that described transmitting terminal include main laser,
Main laser exocoel and information encrypting module, described main laser exocoel has feedback cavity, described main laser
The laser sent forms feedback circuit after described feedback cavity, makes described main laser be operated in chaos shape
State, is provided with High speed phase modulators in described feedback circuit, described phase-modulator is according to phase place double secret key
Light in feedback circuit carries out phase-modulation, and described phase place key is pseudo-random sequence, described in be operated in chaos
The chaotic laser light signal that the main laser of state sends is launched through described information encrypting module.
Transmitting terminal the most according to claim 1, it is characterised in that the quantity of described feedback cavity is many
Individual, the light that described main laser sends is optically coupled device and is divided into identical multichannel light, the way of described light
Identical with the number of described feedback cavity.
Transmitting terminal the most according to claim 2, it is characterised in that the phase place in each feedback circuit is close
Key is separate.
Transmitting terminal the most according to claim 1, it is characterised in that described information encrypting module includes
Manipulator, described manipulator for modulating described chaotic laser light signal by secret signal.
5. according to the transmitting terminal described in Claims 2 or 3, it is characterised in that described main laser exocoel
In also include the first optical circulator, the first photo-coupler, the second photo-coupler and the 3rd photo-coupler, described
The laser that laser instrument sends by described first optical circulator derive, the outfan of described first optical circulator with
The input light of described first photo-coupler connects, and the outfan of described first photo-coupler is respectively with described the
The input of two photo-couplers, the input light of described information encrypting module connect, described information encrypting module
Being launched by chaotic carrier signal after encryption, the outfan output two-way of described second photo-coupler is identical
Laser, the laser that described two-way is identical is first via laser and the second road laser, and described first via laser exists
Entering first phase manipulator after the first feedback cavity, described second road laser is laggard through the second feedback cavity
Enter second phase manipulator, the outfan of described first phase manipulator, described second phase manipulator defeated
Go out the end input light all with described 3rd photo-coupler to be connected, the outfan of described 3rd photo-coupler and institute
The input light stating the first optical circulator connects, and described first optical circulator will input described first optical circulator
Light import inside main laser.
6. the receiving terminal of a secret signalling, it is characterised in that described receiving terminal include from laser instrument,
From laser external cavity, photo-coupler and information deciphering module, described have feedback cavity from laser external cavity, institute
State photo-coupler and the chaotic carrier signal received is divided into first via optical signal and the second road optical signal, described
From laser instrument, there is the feedback cavity identical with transmitting terminal and phase-modulator, the described laser sent from laser instrument
After described feedback cavity, form feedback circuit, described feedback circuit is provided with described phase-modulator, institute
State laser after described phase-modulator, enter into described from laser instrument together with described first via optical signal
In, make from laser works at chaos state, produce the chaotic signal Tong Bu with described chaotic carrier signal,
Described chaotic signal and described second road optical signal all inject the input of described information deciphering module, Jing Guosuo
Exporting secret signal after stating the deciphering of information deciphering module, the phase-modulator in described feedback circuit uses phase
Position double secret key laser carries out phase perturbation, and described phase place key is pseudo-random sequence, in described feedback circuit
Phase place key in the feedback circuit that described phase place key is corresponding with described transmitting terminal is identical.
Receiving terminal the most according to claim 6, it is characterised in that the quantity of described feedback cavity is many
Individual, the described light sent from laser instrument is optically coupled device and is divided into identical multichannel light, the way of described light
Identical with the number of described feedback cavity.
Transmitting terminal the most according to claim 7, it is characterised in that the phase place in each feedback circuit is close
Key is separate.
Transmitting terminal the most according to claim 1, it is characterised in that described information deciphering module includes
Demodulator, described demodulator is for separating secret signal from described chaotic laser light signal.
10. according to the receiving terminal described in claim 6 or 7, it is characterised in that described from laser external cavity
In also include the second optical circulator, the 4th photo-coupler, the 5th photo-coupler, the 6th photo-coupler, described
First via optical signal injects the input of described 6th photo-coupler, and the input of described 6th photo-coupler is also
It is connected with the outfan light of the outfan of described third phase manipulator, described 4th phase-modulator, described
The outfan of the 6th photo-coupler is connected with the input light of described second optical circulator, described second light annular
The laser of input is imported described inside laser instrument by device, the input of described third phase manipulator, described
The input of the 4th phase-modulator all outfan light with described 5th photo-coupler is connected, described from laser
The laser that device sends is derived by described second optical circulator, is injected into the input of described 4th photo-coupler
End, the outfan of described 4th photo-coupler respectively with the input of described 5th photo-coupler, information deciphering
The input light of module connects, and the outfan of described 5th photo-coupler exports the laser that two-way is identical, described
The laser that two-way is identical is the 3rd road laser and the 4th road laser, and described 3rd road laser is through the 3rd feedback
Entering the input of third phase manipulator behind chamber, described 4th road laser enters the after the 4th feedback cavity
The input of four phase-modulators.
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