CN107786333B - Optical signal two-dimensional encryption/decryption system based on time lens imaging - Google Patents
Optical signal two-dimensional encryption/decryption system based on time lens imaging Download PDFInfo
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- CN107786333B CN107786333B CN201711062433.XA CN201711062433A CN107786333B CN 107786333 B CN107786333 B CN 107786333B CN 201711062433 A CN201711062433 A CN 201711062433A CN 107786333 B CN107786333 B CN 107786333B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 38
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 239000011159 matrix material Substances 0.000 claims abstract description 65
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 11
- 108010076504 Protein Sorting Signals Proteins 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 230000002123 temporal effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Classifications
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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
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
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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
Abstract
An optical signal two-dimensional encryption/decryption system based on time lens imaging is characterized in that: the system comprises a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix unfolding subsystem; the square matrix arrangement subsystem adopts a delay technology to arrange the sequence codes into Fang Zhenma; the line encryption subsystem encrypts the array codes line by adopting the key codes to obtain new array codes; the column encryption subsystem adopts a key code to encrypt the new array code column by column; and the square matrix unfolding subsystem unfolds the square matrix codes again by using a delay technology to obtain the two-dimensional encrypted ciphertext sequence codes. In the reverse order described above, two-dimensional decryption of the signal can be achieved. Both row encryption and column encryption are achieved by inverting a set of serial codes through a time lens imaging system. The invention provides a time lens imaging-based optical signal two-dimensional encryption/decryption system with higher security.
Description
Technical Field
The invention relates to an optical signal two-dimensional encryption/decryption system constructed by utilizing a time lens imaging technology.
Background
A time lens refers to an optical device capable of generating a secondary time phase shift to an optical signal, and is used for signal processing in the field of optical communication, and preferably, four-wave mixing (FWM) is used to realize a time lens effect. The electric field amplitudes are E s (t) and E p FWM action is generated between the signal light and pump light to generate idle wave electric field amplitudeIdle light E idler With respect to the input signal light E s A secondary phase shift is introduced, which is the fundamental principle of FWM to produce a temporal lens effect.
From an input section of optical fibre (second order dispersion is phi) 1 ＝β 2s L s ) Time lens (focal length dispersion phi) f ＝-φ″ p /2＝-β 2p L p /2) and output section fiber (second order dispersion is phi 2 ＝β 2i L i ) The three parts form a time lens imaging system. The chromatic dispersion of the front and back sections of optical fiber are respectivelyφ″ 1 ＝β 2s L s ，φ″ 2 ＝β 2i L i The focal length dispersion of the time lens is completely determined by the dispersion undergone by the pump light, phi f ＝-φ″ p /2＝-β 2p L p /2，β 2s 、β 2i Second order Abbe coefficients, beta, of two lengths of optical fibre respectively 2p Is the second order dispersion coefficient of the pump light transmission fiber; l (L) s 、L i The lengths of the front section and the rear section of optical fiber are respectively L p Is the length of the fiber over which the pump light undergoes dispersion broadening. When the second-order dispersion quantity phi' of two sections of optical fibers 1 、φ″ 2 Focal length dispersion phi' of time lens f Satisfies imaging conditions therebetweenWhen the input optical signal is amplified or compressed, the amplification factor M=phi% 2 /φ″ 1 。
The prior art has the defects that: the complexity of optical signal encryption and decryption is not high, and the optical information encrypted in one dimension can be intercepted and cracked in the transmission process.
Disclosure of Invention
In order to overcome the defects that the optical information encryption density is not high enough and can be stolen and cracked by lawbreakers in the prior art, the invention provides the optical signal encryption/decryption system based on time lens imaging, which is used for effectively realizing two-dimensional encryption and decryption of optical signals and has higher security.
In order to solve the technical problems, the invention adopts the following technical scheme:
the system comprises a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix expansion subsystem; the square matrix arrangement subsystem adopts a delay technology to arrange the sequence code text into Fang Zhenma; the line encryption subsystem encrypts the array codes line by adopting a key code to obtain a new array code; the column encryption subsystem adopts a key code to encrypt the new array code column by column; and the square matrix unfolding subsystem unfolds the square matrix codes again by using a delay technology to obtain a two-dimensional encrypted sequence ciphertext.
The inverse process of the invention can realize two-dimensional decryption of signals.
Further, the optical signal two-dimensional encryption/decryption system is provided with two subsystems, namely an encryption subsystem and a decryption subsystem, wherein the encryption subsystem is divided into four parts of a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix expansion subsystem; the decryption subsystem comprises a square matrix arrangement subsystem, a column decryption subsystem, a row decryption subsystem and a square matrix unfolding subsystem.
In the encryption subsystem, the original text sequence codes are arranged into matrix codes, and the matrix codes are restored into sequence codes, which are realized by adopting a time delay technology; the matrix codes are encrypted and the column encryption is realized by inverting the sequence codes by a time lens imaging system, pump light in the time lens imaging system plays a key function, and the random characteristics of 0 code and 1 code in the pump light sequence are utilized to encrypt the whole matrix code according to two dimensions of rows and columns; in the decryption subsystem, the encrypted matrix code obtains decryption under the action of the same pumping light sequence stream again, and the original sequence code stream is recovered.
In the process of encrypting the matrix code in rows and encrypting the matrix code in columns, the time lens imaging system controls the pulse width of the pumping light so that the pulse width of the pumping light can cover the duration of the optical signal of the whole row/column, thereby realizing the encryption and decryption of the inversion of the signal of the whole row/column.
The technical conception of the invention is as follows: in a time lens imaging system, when phi 2 ＝-φ″ 1 The magnification M = -1, when the output signal of the time lens imaging system is inverted in time with respect to the input signal.
The beneficial effects of the invention are as follows: the random sequence flow of the pumping light realizes the time lens effect and simultaneously also realizes the encryption operation on the signal sequence as a key, and the matrix code can be encrypted in two dimensions of the row and the column through two time lens imaging systems, so that the confidentiality of the optical transmission system is greatly improved, and the risk of being cracked is reduced.
Drawings
FIG. 1 is a system composition of the invention, original text sequence codes are arranged into matrix codes through a delay technology, a time lens imaging system performs random inversion on the matrix codes according to rows to obtain one-dimensional encryption, and a time lens imaging system performs random inversion on the matrix codes according to columns to obtain two-dimensional encryption. Finally, converting the matrix code into a ciphertext sequence through a delay technology again, namely realizing the two-dimensional encryption process of the signal light; otherwise, two-dimensional decryption of the signal light can be realized.
Fig. 2 is a schematic diagram of the operation of the time lens imaging system, and in fig. 2 (a), the sequence of a pair of light pulses is reversed after imaging, and if the light pulses are a plurality of pulse sequences, the arrangement sequence is completely reversed, so that the signal is encrypted. In fig. 2 (b), the inverted sequence signal is again inverted to restore to the original signal state, thereby realizing the decryption of the signal.
FIG. 3 is a graph of simulated calculations of inversion of a pair of light pulses having a pulse width of 5ps and a pitch of 10ps after passing through a time lens imaging system.
Fig. 4 is a simulated computation graph of two-dimensional encryption of a 16-bit random signal sequence stream 1100101001010011 by a time lens imaging system, wherein fig. 4 (a) is an inversion of four codes at line 1, fig. 4 (b) is an inversion of four codes at line 4, fig. 4 (c) is an inversion of four codes at column 2, and fig. 4 (d) is an inversion of four codes at column 4.
Detailed Description
The invention will be further described by means of specific embodiments with reference to the accompanying drawings, to which the scope of protection of the invention is not limited.
Referring to fig. 1 to 4, an optical signal two-dimensional encryption/decryption system based on time lens imaging includes a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix expansion subsystem; the square matrix arrangement subsystem adopts a delay technology to arrange the sequence code text into Fang Zhenma; the line encryption subsystem encrypts the array codes line by adopting a key code to obtain a new array code; the column encryption subsystem adopts a key code to encrypt the new array code column by column; and the square matrix unfolding subsystem unfolds the square matrix codes again by using a delay technology to obtain a two-dimensional encrypted sequence ciphertext.
The inverse process of the invention can realize two-dimensional decryption of signals.
Further, the optical signal two-dimensional encryption/decryption system is provided with two subsystems, namely an encryption subsystem and a decryption subsystem, wherein the encryption subsystem is divided into four parts of a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix expansion subsystem; the decryption subsystem comprises a square matrix arrangement subsystem, a column decryption subsystem, a row decryption subsystem and a square matrix unfolding subsystem.
In the encryption subsystem, the original text sequence codes are arranged into matrix codes, and the matrix codes are restored into sequence codes, which are realized by adopting a time delay technology; the matrix codes are encrypted and the column encryption is realized by inverting the sequence codes by a time lens imaging system, pump light in the time lens imaging system plays a key function, and the random characteristics of 0 code and 1 code in the pump light sequence are utilized to encrypt the whole matrix code according to two dimensions of rows and columns; in the decryption subsystem, the encrypted matrix code obtains decryption under the action of the same pumping light sequence stream again, and the original sequence code stream is recovered.
In the process of encrypting the matrix code in rows and encrypting the matrix code in columns, the time lens imaging system controls the pulse width of the pumping light so that the pulse width of the pumping light can cover the duration of the optical signal of the whole row/column, thereby realizing the encryption and decryption of the inversion of the signal of the whole row/column.
In this embodiment, the line encryption subsystem and the column encryption subsystem are both completed by the time lens imaging system, and when the pump light in the time lens imaging system is 0 code, the time lens effect does not occur, and all the codes of the line/column remain unchanged; when the pumping light is 1 code, the time lens effect occurs, all code sequences of the rows/columns are subjected to inversion sequencing, and the pumping light is used as a secret key to realize the complicated encryption of the original text sequence code through the two-dimensional encryption process according to the rows and the columns.
The time lens imaging systems used in this embodiment are all inputThe optical fiber comprises a section of optical fiber, a time lens and an output section of optical fiber, wherein the time lens is realized by FWM effect of pump light and signal light in a highly nonlinear medium. The time lens imaging subsystem is characterized by the second order dispersion of the output section fiber being opposite to that of the input section fiber, i.e. 2 ＝-φ″ 1 At this time, m= -1. When the time lens effect really occurs, inversion operation on the input optical signal can be realized; when the time lens effect is not present, no inversion of the optical signal occurs. Whether the time lens effect is present depends on whether pump light is present. The time lens effect occurs during all 1 code periods in the pump light sequence stream, the signal is inverted, and the time lens effect does not exist and the signal does not change during all 0 code periods in the pump light sequence stream.
Referring to FIG. 2, to satisfyThe parameters of both temporal lens imaging subsystems are selected as: beta 2s ＝20ps 2 /km，L s ＝1km，β 2i ＝-20ps 2 /km，L i ＝1km，β 2p ＝20ps 2 /km，L p =1 km. At this time, phi' 2 ＝-φ″ 1 ，M＝-1。
FIG. 3 shows a pulse width T 0 A pair of optical pulses at a pitch Δt=10ps undergo a temporal inversion after passing through the temporal lens imaging system.
Figures 1 and 4 illustrate a detailed process of two-dimensional encryption of a sequence of originals through the system. The original sequence is as follows: 1100101001010011 arranged in a square matrixThe key (i.e. the random sequence of the pump light) is 1001, when the pump light is 1 code, the code element sequence of the line is inverted, namely the 1 st line and the 4 th line are inverted, and the 2 nd line and the 3 rd line are unchanged, so that the matrix code becomes ++after the encryption of the lines>Then row encryption is carried out on the matrix code, the secret key (namely the pumping light random sequence) is 0101, the 1 st row and the 3 rd row are kept unchanged, inversion is carried out on the 2 nd row and the 4 th row, and the matrix code is changed into +.>Then the sequence code is converted into a sequence code by a delay technology, namely: 0110111100001001, the two-dimensional encryption process of the sequence code is completed. In contrast to the decryption process, it is worth mentioning that the same key must be used in the decryption process as in the encryption process to ensure that the signal is completely recovered.
In the above embodiment, the core idea is to encrypt the matrix code in two dimensions of rows and columns, so as to improve encryption complexity and reduce the risk of cracking. When the signal sequence is converted into the matrix code by the delay technology, the number of rows and columns of the matrix can be changed according to the situation, and the signal sequence can be converted into the matrix with other dimensions besides 4X 4. In the time lens imaging process, a pump pulse width must be made to completely cover the entire row or column signal sequence to realize the inversion process of the signal sequence.
The decryption process of the ciphertext can be realized by adopting the reverse process.
Claims (1)
1. An optical signal two-dimensional encryption/decryption system based on time lens imaging is characterized in that: the system comprises a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix unfolding subsystem; the square matrix arrangement subsystem adopts a delay technology to arrange the sequence codes into Fang Zhenma; the line encryption subsystem encrypts the array codes line by adopting a key code to obtain a new array code; the column encryption subsystem adopts a key code to encrypt the new array code column by column; the square matrix unfolding subsystem unfolds the square matrix codes again by using a delay technology to obtain two-dimensional encrypted sequence codes;
the optical signal two-dimensional encryption/decryption system comprises two subsystems, namely an encryption subsystem and a decryption subsystem, wherein the encryption subsystem is divided into four parts of a square matrix arrangement subsystem, a row encryption subsystem, a column encryption subsystem and a square matrix expansion subsystem; the decryption subsystem comprises a square matrix arrangement subsystem, a column decryption subsystem, a row decryption subsystem and a square matrix unfolding subsystem;
in the encryption subsystem, the original text sequence codes are arranged into matrix codes, and the matrix codes are restored into sequence codes, which are realized by adopting a time delay technology; the matrix codes are encrypted and the column encryption is realized by inverting the sequence codes by a time lens imaging system, pump light in the time lens imaging system plays a key function, and the random characteristics of 0 code and 1 code in the pump light sequence are utilized to encrypt the whole matrix code according to two dimensions of rows and columns; in the decryption subsystem, the encrypted matrix code obtains decryption under the action of the same pumping light sequence flow again, and the original sequence code flow is recovered;
in the process of encrypting the matrix code in rows and columns by the time lens imaging system, the pulse width of the pump light is controlled so that the pulse width of the pump light can cover the duration of the optical signal of the whole row/column, thereby realizing the encryption and decryption of the inversion of the signal of the whole row/column;
the time lens imaging system consists of an input section optical fiber, a time lens and an output section optical fiber, wherein the second-order dispersion phi of the output section optical fiber 2 Second order dispersion phi of optical fiber with input section 1 "opposite, i.e. φ 2 ″＝-φ 1 "C"; magnification m=Φ of the time lens imaging system 2 ″/φ 1 "= -1, thereby effecting inversion of the signal.
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| CN110221501A (en) * | 2019-05-23 | 2019-09-10 | 浙江工业大学 | A kind of stack system for realizing optical signal based on time lens imaging system |
| CN111474803A (en) * | 2020-04-03 | 2020-07-31 | 浙江工业大学 | All-optical XOR optical logic gate operation system based on time lens imaging |
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| CN102932142A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Optical data signal encryption and decryption method in optical fiber communication system |
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| CN105739214A (en) * | 2016-05-11 | 2016-07-06 | 浙江工业大学 | Time lens imaging system |
| CN106209258A (en) * | 2016-07-01 | 2016-12-07 | 浙江工业大学 | A kind of optical signal enciphering/deciphering system based on time lens imaging |
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| WO2014082090A1 (en) * | 2012-11-26 | 2014-05-30 | Massively Parallel Technologies, Inc. | System and method for secure communications and data storage using multidimensional encryption |
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| CN101237321A (en) * | 2008-02-03 | 2008-08-06 | 西北农林科技大学 | Encryption method based on cycle queue shift rule |
| CN102932142A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Optical data signal encryption and decryption method in optical fiber communication system |
| CN102932137A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Signal all-optical encryption and decryption key distribution method based on optical fiber wavelength division multiplexing system |
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