CN116722932B - Physical key distribution system and method based on DFB laser synchronous keying - Google Patents
Physical key distribution system and method based on DFB laser synchronous keying Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
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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
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the technical field of semiconductor devices, in particular to a physical key distribution system and a physical key distribution method based on DFB laser synchronous keying, which solve the corresponding technical problems and comprise a super-radiation light-emitting diode, an isolator, a coupler, a real-time digital oscilloscope, alice and Bob communication parties; the two communication sides have the same structure and comprise two adjustable attenuators, two polarization controllers, two couplers, a DFB laser, an optical circulator, an erbium-doped fiber amplifier, an electro-optical modulator, an arbitrary waveform generator and a photoelectric detector. The invention realizes the random switching of the synchronous state by carrying out the switch control on the feedback light path of the DFB laser, and enhances the safety of key distribution; the DFB laser is switched between an open loop structure and a closed loop structure, the private keys of the two parties are compared, random sequences when the private keys are identical are screened, the generation of a consistent key is realized, the synchronous recovery time is shortened, and the key distribution rate is improved.
Description
Technical Field
The invention relates to the technical field of semiconductor devices, in particular to an optical feedback DFB laser, and specifically relates to a physical key distribution system and a physical key distribution method based on DFB laser synchronous keying.
Background
The secret communication is related to the aspects of national stability, social security and the like. Secure, secure communications are the goal of human society pursuit.
The one-time-pad encryption scheme proposed by Shannon (Shannon) can realize absolutely secure secret communication, and requires the two parties of communication to generate a high-speed random key and perform secure distribution. Therefore, secure and high-speed key distribution is one of core technologies for realizing absolute secure secret communication.
Current key distribution schemes are largely divided into mathematical algorithm-based key distribution and physical layer-based key distribution.
1. Key distribution based on mathematical algorithms.
At present, a communication system generally adopts a mathematical algorithm for encryption, and both communication parties generate a consistent random key by using a complex mathematical algorithm and a consistent seed to finish key distribution. However, the security of such schemes relies mainly on the complexity of mathematical algorithms, such as factorization of large integers (RSA algorithm), discrete logarithm of elliptic curve (ECC algorithm), etc., the higher the complexity, the lower the key generation rate. This results in security and encryption/decryption speed being a pair of contradictors. Furthermore, the security of the encryption of mathematical algorithms is based on the fact that eavesdroppers have only limited computational power. However, with the increase of the processing speed of the computer and the optimization of the algorithm, the security of such key distribution faces a great challenge. For example, the DES algorithm was broken by RSA company supercomputers in 1999; in 2015, the RSA algorithm was broken by the Xueer algorithm; the AES-256 algorithm was broken by a collision attack in 2017.
2. Physical layer based key distribution.
The security of key distribution based on the physical layer mainly depends on the true randomness and non-replicability of physical phenomena, and typical schemes include quantum key distribution, key distribution based on random selection of parameters of a fiber laser, key distribution based on reciprocity of a fiber channel, and key distribution based on chaotic synchronization.
(1) Quantum key distribution.
The quantum key distribution scheme is unconditionally secure: based on the uncertainty principle, an eavesdropper cannot accurately acquire quantum state information, and quanta follow the unclonability principle, so that eavesdropping on quantum key distribution can generate unavoidable interference to both parties of the legal communication and be perceived. However, the inefficiency of single photon detectors makes key distribution rates difficult to meet the rate requirements of modern secure communications. For example, the fastest rate of quantum key distribution in free space is only 20-400 bits/s.
(2) Key distribution based on random selection of fiber laser parameters.
The key distribution based on the ultra-long fiber laser is to form a resonant cavity of the fiber laser by utilizing a fiber communication path, the two communication parties independently and randomly select laser parameters, such as the center wavelength, the cavity length and the like of a reflector, when the parameters selected by the two parties are different, the output states of the fiber laser are the same, an eavesdropper cannot learn the parameter selection information of the two parties, and the legal communication parties can judge the selection information of the other party through the output signal characteristics of the laser and the own parameter selection condition, so that safe key exchange is realized. For example, 2014 British scholars A. El-Taher achieved secure key distribution at a rate of 100 bits/s using a Raman fiber laser at a distance of 500 km. However, in such a scheme, the laser signal needs to be repeatedly transmitted in the resonant cavity formed by the optical fiber communication path for multiple cycles to realize 1bit key distribution, so that the key distribution rate is greatly limited.
(3) Key distribution based on fibre channel reciprocity.
The key distribution scheme based on the reciprocity of the optical fiber channels has the meaning that both communication parties share the same optical fiber link, noise components introduced during the transmission of optical signals are highly consistent, and characteristic parameters of the signals are affected by the noise to be highly consistent and randomly changed. The two communication parties use the obtained highly-relevant random signals as a physical entropy source, and simultaneously extract consistent random keys from the respective detection signals at different places to realize key distribution. In order to break through the influence of noise bandwidth on the key generation rate, researchers add a high-frequency disturbance device in the optical path to increase the rate to Gbps. However, when long-distance transmission is performed, the reciprocity of the optical fiber channel is difficult to keep on a strong level, so that the error rate of the key is large, the security is poor, and even the key distribution process cannot be completed.
(4) Key distribution based on chaotic synchronization.
The semiconductor laser can generate rich nonlinear dynamics states, namely chaos, under external disturbance, and typical disturbance modes are as follows: optical feedback, optical injection, and electro-optical feedback. The most significant advantage of semiconductor laser chaos is broadband, large amplitude and noise-like. Based on the characteristics, the chaotic laser can be used for generating Gbit/s magnitude in real time and generating Tbit/s magnitude random keys offline.
The parameter-matched lasers can realize chaotic synchronization under the conditions of unidirectional injection, mutual coupling and common signal driving, namely, a time sequence with high correlation is generated. Therefore, the realization of the chaotic synchronization phenomenon is combined with the generation of random keys based on chaotic signals, and a new key distribution idea based on chaotic synchronization is provided. The key distribution scheme based on chaotic synchronization is that legal users use a synchronous chaotic laser as a related signal source and an independent random private key to key a transceiver, and finally consistent keys are extracted by screening chaotic time sequences modulated by the same private key, so that key distribution is realized. For example, in 2012, continuous light with fixed amplitude and random phase is used as a drive, so that chaotic synchronization of a semiconductor laser is realized, and finally, key distribution with a distribution rate of 64kbit/s is realized. In 2017, the group uses continuous light with fixed amplitude and random phase as drive, so that chaotic synchronization of the photon integrated semiconductor laser is realized, and finally, key distribution with the speed of 184kbit/s is realized. However, closed loop semiconductor lasers have tens of ns of sync recovery time during the sync and non-sync switching, limiting the key distribution rate of such schemes to the kbps order. And compared with the closed loop structure, the synchronous recovery time of the semiconductor laser with the open loop structure is reduced by a plurality of orders of magnitude, and the key distribution rate is expected to be improved in magnitude.
In summary, the existing key distribution scheme has the problems of poor security or low distribution rate. Therefore, there is a need for a high-speed and secure key distribution technique that solves the key technical hurdle of high-speed key secure distribution in "one-time-pad" absolute secure secret communications.
Disclosure of Invention
In order to overcome the technical defects of poor safety or low distribution rate of the existing key distribution scheme, the invention provides a physical key distribution system and a physical key distribution method based on DFB laser synchronous keying.
The invention discloses a physical key distribution system based on DFB laser synchronous keying, which comprises: the ultra-radiation light-emitting diode, the isolator, the total coupler, the real-time digital oscilloscope, the Alice communication party and the Bob communication party for legal communication, wherein a broadband signal generated by the ultra-radiation light-emitting diode is input into the total coupler in a unidirectional way through the isolator and then is equally divided into two paths to be respectively transmitted to the Alice communication party and the Bob communication party;
the Alice communication party comprises a first adjustable attenuator, a first polarization controller, a first coupler, a second coupler, a first DFB laser, a first optical circulator, a first erbium-doped fiber amplifier, a second polarization controller, a first electro-optic modulator, a first arbitrary waveform generator, a second adjustable attenuator and a first photoelectric detector; one path of output signals of the total coupler sequentially passes through the first adjustable attenuator and the first polarization controller and then is connected to the first end of the first coupler, the second end of the first coupler is connected to the first end of the second coupler, the second end of the second coupler is connected to the first DFB laser, the third end of the second coupler is connected to the first end of the first optical circulator, the second end of the first optical circulator sequentially passes through the first erbium-doped optical fiber amplifier, the second polarization controller, the first electro-optic modulator and the second adjustable attenuator and then is connected to the third end of the first optical circulator, the first arbitrary waveform generator is connected with the first electro-optic modulator and used for controlling the first electro-optic modulator to carry out on-off keying on the optical path, the signal output end of the first arbitrary waveform generator is also connected to the real-time digital oscilloscope, and the third end of the first coupler is connected to the real-time digital oscilloscope through the first photoelectric detector;
the Bob communication party comprises a third adjustable attenuator, a third polarization controller, a third coupler, a fourth coupler, a second DFB laser, a second optical circulator, a second erbium-doped fiber amplifier, a fourth polarization controller, a second electro-optic modulator, a second arbitrary waveform generator, a fourth adjustable attenuator and a second photoelectric detector; the other path of output signal of the total coupler sequentially passes through a third adjustable attenuator and a third polarization controller and then is connected to the first end of the third coupler, the second end of the third coupler is connected to the first end of the fourth coupler, the second end of the fourth coupler is connected to a second DFB laser, the third end of the fourth coupler is connected to the first end of a second optical circulator, the second end of the second optical circulator sequentially passes through a second erbium-doped optical fiber amplifier, a fourth polarization controller, a second electro-optic modulator and a fourth adjustable attenuator and then is connected to the third end of the second optical circulator, a second arbitrary waveform generator is connected with the second electro-optic modulator and used for controlling the second electro-optic modulator to carry out on-off keying on the optical path, the signal output end of the second arbitrary waveform generator is also connected to a real-time digital oscilloscope, and the third end of the third coupler is connected to the real-time digital oscilloscope through a second photoelectric detector;
the real-time digital oscilloscope collects data of all input signals; and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
The invention uses the broadband light source generated by the super-radiation light-emitting diode as the driving signal, so that the chaotic signals generated by the first DFB laser and the second DFB laser have no time delay characteristic, and the correlation of the laser signals generated by the optical feedback DFB laser under the two conditions of feedback and non-feedback is very low. The on-off keying is adopted to control the existence of feedback light paths of the first DFB laser and the second DFB laser, so that the synchronous and asynchronous state switching of output signals of the first DFB laser and the second DFB laser is realized, the synchronous recovery time is shortened compared with the phase random keying scheme of the laser with the closed-loop structure, and the key distribution rate can be improved.
The invention also provides a physical key distribution method based on DFB laser synchronous keying, which is realized based on the physical key distribution system based on DFB laser synchronous keying, and comprises the following steps:
(1) firstly, a broadband signal generated by a super-radiation light-emitting diode is unidirectionally input to a total coupler through an isolator and then is equally divided into two paths to be respectively transmitted to an Alice communication party and a Bob communication party;
(2) the signal transmission paths of the Alice communication party and the Bob communication party are the same, the Alice communication party is taken as an example, the signal output by the main coupler is input into a first adjustable attenuator to adjust the intensity, then the polarization state of the injected signal is adjusted by a first polarization controller, the output signal of the first polarization controller is sequentially injected into a first DFB laser after passing through the first coupler and the second coupler, one part of the laser signal output by the first DFB laser is output from the third end of the second coupler and then is input into a first erbium-doped optical fiber amplifier for amplification through a first optical circulator, the amplified laser signal is injected into the second polarization controller to adjust the polarization state and then sequentially passes through a first electro-optical modulator, a second adjustable attenuator, the first optical circulator and the second coupler and then is fed back into the first DFB laser, the first electro-optical modulator is switched and keyed under the control of an A party key generated by the first random waveform generator, the other part of the laser signal output by the first DFB laser is sequentially passed through the second coupler and the first coupler and then is input into a first erbium-doped optical fiber amplifier for amplification, the amplified laser signal is output from the first coupler and then passes through the first optical coupler and is recorded into a digital waveform, and the same digital waveform is recorded by the oscilloscope, and the digital waveform is recorded by the first oscilloscope and the digital oscilloscope is recorded in real time; similarly, a private key of the party B generated by a second arbitrary waveform generator in the Bob communication party is detected and recorded by a real-time digital oscilloscope, laser signals are converted into electric signals after passing through a second photoelectric detector, and then the electric signals are detected and recorded by the real-time digital oscilloscope;
(3) and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
Preferably, the key distribution protocol is: when the private keys of the Alice communication party and the Bob communication party are the same and are both 1, the first DFB laser and the second DFB laser are in a closed-loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signals is X 1 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are the same and are both 0, the first DFB laser and the second DFB laser are in an open loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signals is X 0 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are different, the Alice communication party and the Bob communication party are not synchronous, and a consistent key cannot be generated.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
1. the invention uses the broadband noise signal as the driving source, which has the characteristic of broadband, so that an eavesdropper can not completely observe the time domain change and then can not reconstruct the complete driving signal, thereby effectively enhancing the safety of key distribution; furthermore, the invention realizes the random switching of the synchronous state by carrying out the switch control on the feedback light path of the DFB laser, and the structure of the DFB laser is changed, thereby further enhancing the safety of key distribution; 2. according to the invention, the DFB laser is switched between an open loop structure and a closed loop structure by performing random keying on a feedback light path of the DFB laser, the private key sequences of both sides are compared, and the random sequences extracted when the private keys are the same are screened, so that the generation of a consistent key is realized, the synchronous recovery time is shortened, and the broadband advantage of a chaotic laser signal is utilized, thereby improving the key distribution rate; in summary, the invention solves the problems of poor security and slow distribution rate of the existing key distribution technology, and provides a safe and high-speed key distribution scheme for absolutely safe secret communication.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a physical key distribution system based on DFB laser synchronous keying according to the present invention;
fig. 2 is a schematic diagram of a key distribution protocol of a physical key distribution method based on DFB laser synchronous keying according to the present invention.
Wherein: 1. super-radiation light-emitting diodes; 2. an isolator; 3. a total coupler; 4a, a first adjustable attenuator; 5a, a first polarization controller; 6a, a first coupler; 7a, a second coupler; 8a, a first DFB laser; 9a, a first optical circulator; 10a, a first erbium-doped fiber amplifier; 11a, a second polarization controller; 12a, a first electro-optic modulator; 13a, a first arbitrary waveform generator; 14a, a second adjustable attenuator; 15a, a first photodetector; 4b, a third adjustable attenuator; 5b, a third polarization controller; 6b, a third coupler; 7b, a fourth coupler; 8b, a second DFB laser; 9b, a second optical circulator; 10b, a second erbium-doped fiber amplifier; 11b, a fourth polarization controller; 12b, a second electro-optic modulator; 13b, a second arbitrary waveform generator; 14b, a fourth adjustable attenuator; 15b, a second photodetector; 16. a real-time digital oscilloscope.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the invention.
In one embodiment, as shown in fig. 1, a physical key distribution system based on DFB laser synchronous keying, comprises: the ultra-radiation light-emitting diode 1, the isolator 2, the total coupler 3, the real-time digital oscilloscope 16, and an Alice communication party and a Bob communication party for legal communication, wherein a broadband signal generated by the ultra-radiation light-emitting diode 1 is input into the total coupler 3 in a unidirectional way through the isolator 2 and then is divided into two paths to be respectively transmitted to the Alice communication party and the Bob communication party;
the Alice communication party comprises a first adjustable attenuator 4a, a first polarization controller 5a, a first coupler 6a, a second coupler 7a, a first DFB laser 8a, a first optical circulator 9a, a first erbium-doped fiber amplifier 10a, a second polarization controller 11a, a first electro-optic modulator 12a, a first arbitrary waveform generator 13a, a second adjustable attenuator 14a and a first photodetector 15a; one path of output signals of the total coupler 3 sequentially passes through a first adjustable attenuator 4a and a first polarization controller 5a and then is connected to a first end of a first coupler 6a, a second end of the first coupler 6a is connected to a first end of a second coupler 7a, a second end of the second coupler 7a is connected to a first DFB laser 8a, a third end of the second coupler 7a is connected to a first end of a first optical circulator 9a, a second end of the first optical circulator 9a sequentially passes through a first erbium-doped optical fiber amplifier 10a, a second polarization controller 11a, a first electro-optical modulator 12a and a second adjustable attenuator 14a and then is connected to a third end of the first optical circulator 9a, a first arbitrary waveform generator 13a is connected with the first electro-optical modulator 12a and is used for controlling the first electro-optical modulator 12a to perform on-off keying on the optical path, a signal output end of the first arbitrary waveform generator 13a is also connected to a real-time digital oscilloscope 16, and a third end of the first coupler 6a is connected to a real-time digital oscilloscope 15a through a first optical detector;
the Bob communication party comprises a third adjustable attenuator 4b, a third polarization controller 5b, a third coupler 6b, a fourth coupler 7b, a second DFB laser 8b, a second optical circulator 9b, a second erbium-doped fiber amplifier 10b, a fourth polarization controller 11b, a second electro-optic modulator 12b, a second arbitrary waveform generator 13b, a fourth adjustable attenuator 14b and a second photodetector 15b; the other output signal of the total coupler 3 sequentially passes through a third adjustable attenuator 4b and a third polarization controller 5b and then is connected to the first end of a third coupler 6b, the second end of the third coupler 6b is connected to the first end of a fourth coupler 7b, the second end of the fourth coupler 7b is connected to a second DFB laser 8b, the third end of the fourth coupler 7b is connected to the first end of a second optical circulator 9b, the second end of the second optical circulator 9b sequentially passes through a second erbium-doped optical fiber amplifier 10b, a fourth polarization controller 11b, a second electro-optical modulator 12b and a fourth adjustable attenuator 14b and then is connected to the third end of the second optical circulator 9b, a second arbitrary waveform generator 13b is connected with the second electro-optical modulator 12b and is used for controlling the on-off keying of the optical path of the second electro-optical modulator 12b, the signal output end of the second arbitrary waveform generator 13b is also connected to a real-time digital oscilloscope 16, and the third end of the third coupler 6b is connected to the real-time oscilloscope 16 via a second optical detector 15b;
the real-time digital oscilloscope 16 performs data acquisition on all input signals; and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope 16 to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
In the invention, the broadband light source generated by the super-radiation light-emitting diode 1 is used as a driving signal, so that the chaotic signal generated by the DFB semiconductor laser has no time delay characteristic, and the correlation of the laser signal generated by the DFB laser under the two conditions of feedback and no feedback is very low. The synchronous recovery time based on the open loop structure is shorter than that of the closed loop structure, the two communication parties independently and randomly perform on-off keying on the feedback light path by using respective private keys, when the private keys are consistent, the two DFB lasers are in the open loop structure or the closed loop structure, synchronization can be realized at the moment, when the private keys are inconsistent, one DFB laser is in the open loop structure, the other DFB laser is in the closed loop structure, and at the moment, the correlation of laser signals output by the first DFB laser 8a and the second DFB laser 8b is low, and the two DFB lasers cannot be used for entropy sources. In the invention, the DFB laser switches between the open loop and closed loop structures with or without feedback light paths, and the synchronous recovery time is shortened compared with the random phase change key distribution scheme of the closed loop structure, so that the key distribution rate can be further improved.
The invention also discloses a physical key distribution method based on DFB laser synchronous keying, which is realized based on the physical key distribution system based on DFB laser synchronous keying, and comprises the following steps:
(1) firstly, a broadband signal generated by the super-radiation light-emitting diode 1 is input into the total coupler 3 in a unidirectional way through the isolator 2 and then is uniformly divided into two paths to be respectively transmitted to an Alice communication party and a Bob communication party;
(2) in the Alice communication party, a signal output by a total coupler 3 is input into a first adjustable attenuator 4a to adjust intensity, then the polarization state of an injection signal is adjusted through a first polarization controller 5a, an output signal of the first polarization controller 5a sequentially passes through a first coupler 6a and a second coupler 7a and then is injected into a first DFB laser 8a, a part of a laser signal output by the first DFB laser 8a is output from a third end of the second coupler 7a and then is input into a first erbium-doped optical fiber amplifier 10a through a first optical circulator 9a to be amplified, the amplified laser signal is injected into a second polarization controller 11a to adjust the polarization state and then sequentially passes through a first electro-optic modulator 12a, a second adjustable attenuator 14a, the first optical circulator 9a and the second coupler 7a to be fed back into the first DFB laser 8a, the first electro-optic modulator 12a is subjected to optical key control under an A private switch generated by a first arbitrary waveform generator 13a, the first laser signal is output from a first laser oscillator 13a and then passes through a first coupler 16 to be recorded as a digital waveform generator 16, and then the first laser signal is sequentially output from the first coupler 16 a and then is recorded by a digital oscilloscope; similarly, in the Bob communication party, the signal output by the total coupler 3 is input into the third adjustable attenuator 4B to adjust the intensity, and then the polarization state of the injected signal is adjusted by the third polarization controller 5B, the output signal of the third polarization controller 5B sequentially passes through the third coupler 6B and the fourth coupler 7B and then is injected into the second DFB laser 8B, a part of the laser signal output by the second DFB laser 8B is injected into the fourth coupler 7B, the laser signal is output from the third end of the fourth coupler 7B and then is input into the second erbium-doped optical fiber amplifier 10B through the second optical circulator 9B to be amplified, the amplified laser signal is injected into the fourth polarization controller 11B to adjust the polarization state and then sequentially passes through the second electro-optic modulator 12B, the fourth adjustable attenuator 14B, the second electro-optic circulator 9B and the fourth coupler 7B and then are fed back into the second DFB laser 8B, the second electro-optic modulator 12B converts the laser signal into the optical signal under the control of the B private mode generated by the second arbitrary waveform generator 13B, the second optical fiber is output from the second optical fiber 7B is converted into the second digital signal through the second optical fiber amplifier 6B, the second digital signal is output from the second optical fiber amplifier 16B is recorded by the second photo-acoustic coupler 6B, and the second optical fiber is output from the second optical fiber amplifier 16B is recorded by the second photo-optical fiber amplifier, and the second optical fiber is output from the second optical fiber 7B is recorded by the second optical fiber 7B, and the second optical fiber is recorded by the second optical fiber
The private key of the party B generated by the second arbitrary waveform generator 13B in the Bob communication party is detected and recorded by the real-time digital oscilloscope 16, the laser signal is converted into an electric signal after passing through the second photoelectric detector 15B, and then the detection and recording are carried out by the real-time digital oscilloscope 16;
(3) and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope 16 to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
In particular, in one embodiment, as shown in fig. 2, the key distribution protocol is: when the private keys of the Alice communication party and the Bob communication party are the same and are both 1, the first DFB laser 8a and the second DFB laser 8b are both in a closed loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signal is X 1 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are the same and are both 0, the first DFB laser 8a and the second DFB laser 8b are both in an open loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signal is X 0 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are different, the Alice communication party and the Bob communication party are not synchronous, and a consistent key cannot be generated.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A DFB laser synchronous keying based physical key distribution system comprising: the ultra-radiation light-emitting diode (1), the isolator (2), the total coupler (3), the real-time digital oscilloscope (16), and the Alice communication party and the Bob communication party for legal communication, wherein broadband signals generated by the ultra-radiation light-emitting diode (1) are input into the total coupler (3) in one direction through the isolator (2) and then are uniformly divided into two paths to be respectively transmitted to the Alice communication party and the Bob communication party;
the Alice communication party comprises a first adjustable attenuator (4 a), a first polarization controller (5 a), a first coupler (6 a), a second coupler (7 a), a first DFB laser (8 a), a first optical circulator (9 a), a first erbium-doped fiber amplifier (10 a), a second polarization controller (11 a), a first electro-optic modulator (12 a), a first arbitrary waveform generator (13 a), a second adjustable attenuator (14 a) and a first photoelectric detector (15 a); one path of output signals of the total coupler (3) sequentially passes through a first adjustable attenuator (4 a) and a first polarization controller (5 a) and then is connected to a first end of a first coupler (6 a), a second end of the first coupler (6 a) is connected to a first end of a second coupler (7 a), a second end of the second coupler (7 a) is connected to a first DFB laser (8 a), a third end of the second coupler (7 a) is connected to a first end of a first optical circulator (9 a), a second end of the first optical circulator (9 a) sequentially passes through a first erbium-doped optical fiber amplifier (10 a), a second polarization controller (11 a), a first electro-optical modulator (12 a) and a second adjustable attenuator (14 a) and then is connected to a third end of the first optical circulator (9 a), a first arbitrary waveform generator (13 a) is connected with the first electro-optical modulator (12 a) and is used for controlling the first electro-optical modulator (12 a) to switch on/off, and a second end of the first optical circulator (9 a) is connected to a first oscilloscope (16) through a digital oscilloscope (16) and a real-time signal is further connected to the first end of the first oscilloscope (16);
the Bob communication party comprises a third adjustable attenuator (4 b), a third polarization controller (5 b), a third coupler (6 b), a fourth coupler (7 b), a second DFB laser (8 b), a second optical circulator (9 b), a second erbium-doped fiber amplifier (10 b), a fourth polarization controller (11 b), a second electro-optic modulator (12 b), a second arbitrary waveform generator (13 b), a fourth adjustable attenuator (14 b) and a second photoelectric detector (15 b); the other path of output signals of the total coupler (3) sequentially pass through a third adjustable attenuator (4 b) and a third polarization controller (5 b) and then are connected to the first end of a third coupler (6 b), the second end of the third coupler (6 b) is connected to the first end of a fourth coupler (7 b), the second end of the fourth coupler (7 b) is connected to a second DFB laser (8 b), the third end of the fourth coupler (7 b) is connected to the first end of a second optical circulator (9 b), the second end of the second optical circulator (9 b) sequentially passes through a second erbium-doped optical fiber amplifier (10 b), a fourth polarization controller (11 b), a second electro-optical modulator (12 b) and a fourth adjustable attenuator (14 b) and then is connected to the third end of the second optical circulator (9 b), a second arbitrary waveform generator (13 b) is connected with the second electro-optical modulator (12 b) and is used for controlling the second electro-optical modulator (12 b) to switch on-off, the second arbitrary waveform generator (13 b) is connected to the third end of the third optical circulator (9 b) through a second erbium-doped optical fiber amplifier (10 b), and the second end of the second optical circulator (9 b) is connected to a third real-time oscilloscope (16 b) through a digital oscillograph;
the real-time digital oscilloscope (16) performs data acquisition on all input signals; and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope (16) to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
2. The physical key distribution method based on DFB laser synchronous keying is characterized by being realized based on the physical key distribution system based on DFB laser synchronous keying as set forth in claim 1, and comprises the following steps:
(1) firstly, a broadband signal generated by a super-radiation light-emitting diode (1) is input into a total coupler (3) in one direction through an isolator (2) and then is uniformly divided into two paths to be respectively transmitted to an Alice communication party and a Bob communication party;
(2) the signal transmission paths of the Alice communication party and the Bob communication party are the same, the signal output by the main coupler (3) is input into the first adjustable attenuator (4 a) for adjusting the intensity, then the polarization state of the injected signal is adjusted through the first polarization controller (5 a), the output signal of the first polarization controller (5 a) sequentially passes through the first coupler (6 a) and the second coupler (7 a) and then is injected into the first DFB laser (8 a), a part of the laser signal output by the first DFB laser (8 a) is output from the third end of the second coupler (7 a) and then is input into the first erbium-doped optical fiber amplifier (10 a) for amplification through the first optical circulator (9 a), the amplified laser signal is injected into the second polarization controller (11 a) for adjusting the polarization state and then sequentially passes through the first electro-optical modulator (12 a), the second adjustable attenuator (14 a), the first optical circulator (9 a) and the second coupler (7 a) and then is fed back into the first DFB laser (8 a), the first part of the laser signal output from the first coupler (7 a) is fed back into the first DFB laser (8 a) after being output from the third end of the second coupler (7 a) and then is output from the first optical circulator (7 a) and then is sequentially amplified through the first optical circulator (7 a) and then is output from the first optical circulator (7 a) to the first optical circulator (13 a) and finally the second optical signal is sequentially subjected to wave-phase change, detecting and recording by the real-time digital oscilloscope (16), and detecting and recording the private key of the A side generated by the first arbitrary waveform generator (13 a) by the real-time digital oscilloscope (16) as well; similarly, a private key of the party B generated by a second arbitrary waveform generator (13B) in the Bob communication party is detected and recorded by a real-time digital oscilloscope (16), laser signals are converted into electric signals after passing through a second photoelectric detector (15B), and then the electric signals are detected and recorded by the real-time digital oscilloscope (16);
(3) and finally, transmitting the data of the Alice communication party and the Bob communication party acquired by the real-time digital oscilloscope (16) to a computer, comparing private key information of the communication parties, synchronizing the communication parties when the private keys are the same, and extracting a consistent key sequence from the laser signal.
3. The DFB laser-based synchronized-keying physical key distribution method of claim 2, wherein the key distribution protocol is: when the private keys of the Alice communication party and the Bob communication party are the same and are both 1, the first DFB laser (8 a) and the second DFB laser (8 b) are in a closed-loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signals is X 1 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are the same and are both 0, the first DFB laser (8 a) and the second DFB laser (8 b) are in an open loop structure, the Alice communication party and the Bob communication party realize synchronization, and the consistent key extracted from the laser signals is X 0 The method comprises the steps of carrying out a first treatment on the surface of the When the private keys of the Alice communication party and the Bob communication party are different, the Alice communication party and the Bob communication party are not synchronous, and a consistent key cannot be generated.
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