CN112769538B - Secure communication system with hidden time delay signature - Google Patents
Secure communication system with hidden time delay signature Download PDFInfo
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- CN112769538B CN112769538B CN202011601989.3A CN202011601989A CN112769538B CN 112769538 B CN112769538 B CN 112769538B CN 202011601989 A CN202011601989 A CN 202011601989A CN 112769538 B CN112769538 B CN 112769538B
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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
- 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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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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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Abstract
The invention relates to a time delay signature hidden safety communication system, which comprises a sending end and a receiving end which are connected in a communication way, wherein the sending end comprises: a first chaotic laser for generating an original chaotic light signal; the first photoelectric detector is used for converting the original chaotic optical signal into a chaotic electric signal; the first scrambling module is used for carrying out scrambling operation on the chaotic electric signal; the first digital-to-analog converter is used for converting the signal after the scrambling operation into an optical signal; a first Mach-Zehnder phase modulator for phase modulating the optical signal; the signal after the phase modulation of the first Mach-Zehnder phase modulator is sent to a receiving end; the receiving end is composed of the same devices and structures as the transmitting end, can generate reverse synchronous phase chaos, counteracts the phase chaos through the phase modulator, and then realizes decryption of signals by using robustness of the intensity chaos. The photoelectric detector is used to detect local and received optical power signals, the synchronous error is subtracted, and the information of the sending end is recovered through low-pass filtering.
Description
Technical Field
The invention belongs to the technical field of communication systems, and particularly relates to a time delay signature hidden safety communication system.
Background
The optical chaotic signal has the characteristics of wide frequency band, high complexity, high transmission rate, small attenuation and the like, and is suitable for being used as a carrier for optical chaotic communication. The optical chaotic communication is based on chaotic synchronization, and after optical chaotic signals of a transmitting end and a receiving end are synchronized, a signal to be transmitted can be added into the optical chaotic signals, and the received chaotic signals and local chaotic signals are subtracted by utilizing the robustness of the chaotic signals at the receiving end, so that the signals can be demodulated. In the chaotic communication process, information confidentiality is extremely important, so a safe communication system with a hidden time delay signature is needed to avoid information leakage in the transmission process.
Disclosure of Invention
Based on the above-mentioned shortcomings and drawbacks of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a secure communication system with time-delayed signature hiding that meets one or more of the above-mentioned needs.
In order to achieve the purpose, the invention adopts the following technical scheme:
a secure communication system with hidden time delay signatures, comprising a transmitting end and a receiving end of a communication connection, the transmitting end comprising: the first chaotic laser is used for generating an original chaotic optical signal; the first photoelectric detector is used for converting the original chaotic optical signal into a chaotic electric signal; the first scrambling module is used for carrying out scrambling operation on the chaotic electric signal output by the first photoelectric detector; the first digital-to-analog converter is used for converting the signal subjected to scrambling operation by the first scrambling module into an analog signal; the first Mach-Zehnder phase modulator is used for carrying out phase modulation on the analog signals output by the first digital-to-analog converter; the signal after the phase modulation of the first Mach-Zehnder phase modulator is sent to a receiving end;
the receiving end includes: the second chaotic laser is used for generating a decrypted chaotic optical signal synchronous with the original chaotic optical signal; the second photoelectric detector is used for converting the decrypted chaotic optical signal into a chaotic electric signal; the second scrambling module has the same parameters as the first scrambling module and is used for performing scrambling operation on the chaotic electric signals output by the second photoelectric detector; the second digital-to-analog converter is used for converting the signal subjected to scrambling operation by the second scrambling module into an analog signal; and the second Mach-Zehnder phase modulator is used for performing phase modulation of the analog signal output by the second digital-to-analog converter in inverse synchronization with the first Mach-Zehnder phase modulator, and performing subtraction decoding on the output signal and the decrypted chaotic optical signal.
As a preferred scheme, the first scrambling module and the second scrambling module are composed of an encoder, a sampler, an ascending index sequence arithmetic unit and a scrambling arithmetic unit which are connected in sequence and form a communication loop; the chaotic electric signals output by the first photoelectric detector are respectively sent to an encoder and a sampler of the first scrambling module; the chaotic electric signals output by the second photoelectric detector are respectively sent to the encoder and the sampler of the second scrambling module.
Preferably, the transmitting end further comprises a first electrical amplifier, and the chaotic electric signal output by the first photodetector is output to the first scrambling module through the first electrical amplifier; the receiving end also comprises a second electric amplifier, and the chaotic electric signal output by the second photoelectric detector is output to the second scrambling module through the second electric amplifier; the first electrical amplifier and the second electrical amplifier have the same parameters.
Preferably, the external cavity feedback delay time of the first chaotic laser and the second chaotic laser is 2.67 ns.
Preferably, the bias current of the first chaotic laser and the second chaotic laser is 30 mA.
Preferably, the signal wavelength of the first chaotic laser and the signal wavelength of the second chaotic laser are 1550nm, and the power of the first chaotic laser and the power of the second chaotic laser are 10 mW.
Preferably, the quantum efficiency of the first photodetector and the second photodetector is 0.1.
Preferably, the gain of the first and second electrical amplifiers is 10 dB.
Compared with the prior art, the invention has the beneficial effects that:
the time delay signature hidden safety communication system realizes the chaos time delay hiding in the chaos synchronous communication process and has the characteristics of stable performance and strong confidentiality.
Drawings
Fig. 1 is a system configuration diagram of a secure communication system with hidden time delay signature according to embodiment 1 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example (b): fig. 1 shows a schematic system structure diagram of an embodiment of a secure communication system with hidden time delay signatures according to the present invention. The system comprises a sending end and a receiving end which are mutually connected through optical fiber communication. The transmitting end comprises a first chaotic laser 1-1 connected with a first Mach-Zehnder phase modulator (MZM) 2-1 and used as a chaotic optical signal transmitting end; the optical fiber communication device further comprises the first Mach-Zehnder phase modulator 2-1, the first optical coupler 3-1, the second photoelectric detector 4-1, the first electric amplifier 5-1, the first scrambling module, the first digital-to-analog converter (D/A in the figure) 12-1 and the first Mach-Zehnder phase modulator 2-1 which are sequentially connected to form a communication loop. The first scrambling module consists of a scrambling arithmetic unit, an encoder, a sampler and an ascending index sequence arithmetic unit which are connected in sequence and form a communication loop.
Specifically, in the transmitting end, the a1 port of the first chaotic laser 1-1 is connected with the b1 port of the first mach-zehnder phase modulator 2-1, the b2 port of the first mach-zehnder phase modulator 2-1 is connected with the c1 port of the first optical coupler 3-1, the c2 port of the first optical coupler 3-1 is connected with the d1 port of the first photoelectric detector 4-1, the d2 port of the first photoelectric detector 4-1 is connected with the e1 port of the first electric amplifier 5-1, the e2 and e3 ports of the first electric amplifier 5-1 are connected with the first scrambling module, wherein the e2 port is connected to the f1 port of the first encoder 6-1 in the first scrambling module, and the e3 port is connected to the g1 port of the first sampler 7-1 in the first scrambling module.
In the first scrambling module, the g2 port of the first sampler 7-1 is connected to the h1 port of the first copier 8-1, the h2 port of the first copier 8-1 is connected to the i1 port of the first index sequence generation arithmetic unit 9-1, the i2 port of the first index sequence generation arithmetic unit 9-1 is connected to the j1 port of the first ascending index sequence arithmetic unit 10-1, the j2 port of the first ascending index sequence arithmetic unit 10-1 is connected to the k1 port of the first scrambling arithmetic unit 11-1, the f2 port of the first encoder 6-1 is connected to the k2 port of the first scrambling arithmetic unit 11-1, and the k3 port of the first scrambling arithmetic unit 11-1 is connected to the outside of the first scrambling module and is connected to the l1 port of the first digital-to analog converter 12-1.
The l2 port of the first digital-to-analog converter 12-1 is connected to the b3 port of the first mach-zehnder phase modulator 2-1.
The c3 port of the first optical coupler 3-1 at the transmitting end and the m1 port of the second optical coupler 3-2 at the receiving end are connected by optical fibers, thereby constituting a communication connection between the transmitting end and the receiving end.
The structure of the receiving end is similar to that of the transmitting end, in the receiving end, the x1 port of the second chaotic laser 1-2 is connected with the n3 port of the second mach-zehnder phase modulator 2-2, the m2 port of the second optical coupler 3-2 is connected with the n1 port of the second mach-zehnder phase modulator 2-2, the m3 port of the second optical coupler 3-2 is connected with the o1 port of the second photodetector 4-2, the o2 port of the second photodetector 4-2 is connected with the p1 port of the second electrical amplifier 5-2, the p2 and p3 ports of the second electrical amplifier 5-2 are connected with the second scrambling module, wherein the p2 port is connected to the q1 port of the second encoder 6-2 in the second scrambling module and the p3 port is connected to the q1 port of the second sampler 7-2 in the second scrambling module.
In the second scrambling module, the port r2 of the second sampler 7-2 is connected to the port s1 of the second copier 8-2, the port s2 of the second copier 8-3 is connected to the port t1 of the second index sequence generation arithmetic unit 9-2, the port s2 of the second index sequence generation arithmetic unit 9-2 is connected to the port u1 of the second ascending index sequence arithmetic unit 10-2, the port u2 of the second ascending index sequence arithmetic unit 10-2 is connected to the port v1 of the second scrambling arithmetic unit 11-2, the port q2 of the second encoder 6-2 is connected to the port v2 of the second scrambling arithmetic unit 11-2, and the port v3 of the second scrambling arithmetic unit 11-2 is connected to the port w1 of the second digital-to-analog converter 12-2.
The w2 port of the second digital to analog converter 12-2 is connected to the n2 port of the second mach-zehnder phase modulator 2-2.
In the above devices, the parameters of the devices at the transmitting end and the receiving end are the same, so as to form the same optical path with reverse synchronization.
The following describes a manner of using the time delay signature hiding secure communication system of the present embodiment in conjunction with the above system structure.
An original chaotic optical signal output by a first chaotic laser 1-1 in a sending end enters a first optical coupler 3-1 through an optical fiber through a first Mach-Zehnder phase modulator 2-1, an optical signal of the first optical coupler 3-1 is converted into an electric signal through a first photoelectric detector 4-1, the electric signal passes through a first electric amplifier 5-1 and then respectively enters a first encoder 6-1 and a first sampler 7-1, at the first sampler 7-1, the signal sequentially enters a first duplicator 8-1, a first index sequence generation arithmetic unit 9-1 and a first ascending index sequence arithmetic unit 10-1 to obtain an 8-bit index sequence, the 8-bit index sequence and the 8-bit binary sequence obtained by the signal through the encoder enter a first scrambling arithmetic unit 11-1 to scramble the 8-bit binary sequence, the new 8-bit binary sequence obtained after scrambling is converted into an analog signal after passing through a first digital-to-analog converter 12-1, then enters a first Mach-Zehnder phase modulator 2-1 to perform phase modulation on the chaotic optical signal, and the modulated chaotic optical signal is transmitted to a second optical coupler 3-2 through an optical fiber through a first optical coupler 3-1.
Meanwhile, the receiving end enables the second chaotic laser 1-2 to output a decrypted chaotic optical signal which is synchronous with the original chaotic optical signal output by the first chaotic laser 1-1 in the sending end. After synchronization, the laser bias current of the transmitting end is modulated by using the information to be encrypted, so that information encryption is realized.
At a receiving end, a part of the decrypted chaotic optical signal received by the second optical coupler 3-2 is directly input into a second Mach-Zehnder phase modulator 2-2, the other part of the decrypted chaotic optical signal respectively enters a second encoder 6-2 and a second sampler 7-2 through a second photoelectric detector 4-2 and an electric amplifier 5-2, the second sampler 7-2 receives the signal and then sequentially enters a second duplicator 8-2, a second index sequence generation arithmetic unit 9-2 and a second ascending index sequence arithmetic unit 10-2 to obtain an 8-bit index sequence, the 8-bit index sequence and the 8-bit binary sequence obtained by the encoder enter a second scrambling arithmetic unit 11-2 to scramble the 8-bit binary sequence, and the new 8-bit binary sequence obtained after scrambling is converted into an analog signal through a second digital-to-analog converter 12-2, and then enters a second Mach-Zehnder phase modulator 2-2 to perform reverse phase modulation on the chaotic optical signal entering the second Mach-Zehnder phase modulator 2-2 through a second optical coupler 3-2, and the modulated signal and a decrypted chaotic optical signal sent by a second chaotic laser 1-2 are subjected to subtraction decoding.
The receiving end converts a chaotic signal generated by the first chaotic laser 1-1 into an electric signal through the phase modulator, then divides the electric signal into two paths, one path of the electric signal is changed into a binary 8-bit code, the other path of the electric signal is changed into a discrete signal and is copied into 8 identical sequences, sequence index numbers are extracted and are rearranged according to an ascending order, corresponding original index numbers form a new sequence, the first path of binary 8-bit code is scrambled according to the new index sequence, the scrambled binary 8-bit code is changed into an analog signal, the phase modulator is modulated, and phase chaos is generated. The receiving end uses devices with the same parameters corresponding to the transmitting end to form the same light path, generates reverse synchronous phase chaos, counteracts the phase chaos through the phase modulator, and then uses robustness of the intensity chaos to realize decryption of signals. The photoelectric detector is used to detect local and received optical power signals, the synchronous error is subtracted, and the information of the sending end is recovered through low-pass filtering.
The process of implementing communication is briefly summarized as follows:
1. the receiving end laser generates a chaotic signal synchronous with the transmitting end laser;
2. phase chaos is generated by using electro-optic chaos scrambling phase modulation;
3. after synchronization, the laser bias current of the sending end is modulated by using the information to be encrypted, so that information encryption is realized;
4. the receiving end generates a reverse synchronous phase chaos by using the electro-optic chaos scrambling phase modulation;
5. and detecting local and received optical power signals by using a photoelectric detector, subtracting a synchronization error, and recovering information of a sending end through low-pass filtering.
It should be noted that the above-mentioned only illustrates the preferred embodiments and principles of the present invention, and that those skilled in the art will be able to make modifications to the embodiments based on the idea of the present invention, and that such modifications should be considered as the protection scope of the present invention.
Claims (8)
1. A secure communication system with hidden time delay signature, comprising a transmitting end and a receiving end of a communication connection, wherein the transmitting end comprises: the first chaotic laser is used for generating an original chaotic optical signal; the first photoelectric detector is used for converting the original chaotic optical signal into a chaotic electric signal; the first scrambling module is used for carrying out scrambling operation on the chaotic electric signal output by the first photoelectric detector; the first digital-to-analog converter is used for converting the signal subjected to scrambling operation by the first scrambling module into an analog signal; the first Mach-Zehnder phase modulator is used for carrying out phase modulation on the analog signals output by the first digital-to-analog converter; the signal after the phase modulation of the first Mach-Zehnder phase modulator is sent to a receiving end;
the receiving end includes: the second chaotic laser is used for generating a decrypted chaotic optical signal which is synchronous with the original chaotic optical signal; the second photoelectric detector is used for converting the decrypted chaotic optical signal into a chaotic electric signal; the second scrambling module has the same parameters as the first scrambling module and is used for performing scrambling operation on the chaotic electric signal output by the second photoelectric detector; the second digital-to-analog converter is used for converting the signal subjected to scrambling operation by the second scrambling module into an analog signal; and the second Mach-Zehnder phase modulator is used for performing phase modulation which is in inverse synchronization with the first Mach-Zehnder phase modulator on the analog signal output by the second digital-to-analog converter, and performing subtraction decoding on the output signal and the decrypted chaotic optical signal.
2. The secure communication system for hiding the time delay signature as claimed in claim 1, wherein the first scrambling module and the second scrambling module are respectively composed of an encoder, a sampler, an ascending index sequence operator, and a scrambling operator, which are connected in sequence and form a communication loop; the chaotic electric signals output by the first photoelectric detector are respectively sent to an encoder and a sampler of the first scrambling module; and the chaotic electric signals output by the second photoelectric detector are respectively sent to the encoder and the sampler of the second scrambling module.
3. The secure communication system for hiding the time delay signature as claimed in claim 1, wherein the transmitting end further comprises a first electrical amplifier, and the chaotic electrical signal output by the first photodetector is output to the first scrambling module through the first electrical amplifier; the receiving end also comprises a second electric amplifier, and the chaotic electric signal output by the second photoelectric detector is output to the second scrambling module through the second electric amplifier; the first electrical amplifier and the second electrical amplifier have the same parameters.
4. The system of claim 1, wherein the first and second chaotic lasers have an external cavity feedback delay time of 2.67 ns.
5. The time delay signature hidden secure communication system of claim 1, wherein the bias current of the first chaotic laser and the second chaotic laser is 30 mA.
6. The secure communication system with hidden time delay signature as claimed in claim 1, wherein the signal wavelength of the first chaotic laser and the signal wavelength of the second chaotic laser are 1550nm, and the power of the first chaotic laser is 10 mW.
7. A time delayed signature hiding secure communication system as claimed in claim 1, wherein said first photodetector and said second photodetector have a quantum efficiency of 0.1.
8. A secure communication system with time delay signature concealment as claimed in claim 3, wherein the gain of said first electrical amplifier and said second electrical amplifier is 10 dB.
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| CN114124391B (en) * | 2021-10-20 | 2024-02-13 | 杭州电子科技大学 | OFDM transmission system using chaos and vector combination efficient elliptic curve encryption |
| CN114157497B (en) * | 2021-12-07 | 2024-02-23 | 杭州电子科技大学 | Compressed sensing OFDM-PON secure communication system based on block scrambling |
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Effective date of registration: 20230822 Address after: No. 508-2A, Baoli Tianji North Block, Qiandenghu, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528200 Patentee after: Foshan Haixie Technology Co.,Ltd. Address before: 310018 no.1158, No.2 street, Baiyang street, Hangzhou Economic and Technological Development Zone, Hangzhou, Zhejiang Province Patentee before: HANGZHOU DIANZI University |