CN107786333A - A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging - Google Patents
A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging Download PDFInfo
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- CN107786333A CN107786333A CN201711062433.XA CN201711062433A CN107786333A CN 107786333 A CN107786333 A CN 107786333A CN 201711062433 A CN201711062433 A CN 201711062433A CN 107786333 A CN107786333 A CN 107786333A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 41
- 230000003287 optical effect Effects 0.000 title claims abstract description 29
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 44
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 239000011159 matrix material Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 15
- 239000013307 optical fiber Substances 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 108010076504 Protein Sorting Signals Proteins 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
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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
A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging, it is characterised in that：The system includes square formation arrangement subsystem, row encryption subsystem, row encryption subsystem, square formation expansion subsystem；Sequence code is arranged as square formation code by the square formation arrangement subsystem using delay technology；Row encryption subsystem is encrypted and obtains new square formation code line by line using secret key code other side horizontal and vertical parity check code；Row encryption subsystem is encrypted by column using secret key code to new square formation code；Square formation expansion subsystem, which reuses delay technology, deploys square formation code, obtains the ciphertext sequence code of two dimensional encryption.By above-mentioned opposite order, then it can realize and the two dimension of signal is decrypted.Row encryption and row encrypt equal passage time lens imaging system and realize inverting to one group of sequence code to realize.The invention provides a kind of higher optical signal two dimension enciphering/deciphering system based on time lens imaging of security.
Description
Technical field
The present invention relates to a kind of optical signal two dimension enciphering/deciphering system using time lens imaging technique construction.
Background technology
Time lens are to refer to a kind of optical device to the secondary time-phase displacement of optical signal generation, the letter in optical communication field
Number processing, first choice using four-wave mixing (FWM) realize time lens effect.Electric field amplitude is respectively EsAnd E (t)p(t) letter
With pump light FWM effects, caused idle ripple electric field amplitude occur for number lightIdle light EidlerRelative to defeated
The flashlight E enteredsFor introduce quadratic phase shift, this is the general principle of FWM generation time lens effects.
By input section optical fiber, (2nd order chromatic dispersion amount is φ "1=β2sLs), (focal length dispersion is φ " to time lensf=-φ "p/2
=-β2pLp/ 2), (2nd order chromatic dispersion amount is φ " to deferent segment optical fiber2=β2iLi) three parts one time lens imaging system of formation.
The dispersion measure of front and rear two sections of optical fiber is respectively φ "1=β2sLs, φ "2=β2iLi, the focal length dispersion of time lens is completely by pump light
After dispersion determine, φ "f=-φ "p/ 2=- β2pLp/ 2, β2s、β2iThe second order dispersion coefficient of respectively two sections optical fiber,
β2pIt is the second order dispersion coefficient of pumping optical delivery fiber；Ls、LiThe length of respectively front and rear two sections of optical fiber, LpPump light after
The length of the optical fiber of dispersive broadening.As the 2nd order chromatic dispersion amount φ " of two sections of optical fiber1、φ″2With the focal length dispersion φ " of time lensfIt
Between meet image-forming conditionWhen, it is possible to realize the amplification or compression to input optical signal, wherein multiplication factor
M=φ "2/φ″1。
The defects of prior art is present：Optical signal is encrypted and the complexity of decryption is not high, and the optical information of one-dimensional encryption is passing
It is possible to be trapped and crack during defeated.
The content of the invention
In order to overcome the shortcomings of that optical information encryption degree is not high enough in the prior art, may be stolen and be cracked by criminal,
Effectively optical signal two dimensional encryption and decryption, the higher light based on time lens imaging of security are realized the invention provides a kind of
Signal enciphering/deciphering system.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of optical signal two dimension enciphering/deciphering system based on time lens imaging, the system include square formation arrangement subsystem,
Row encryption subsystem, row encryption subsystem and square formation expansion subsystem；The square formation arrangement subsystem uses delay technology by sequence
Row code original text is arranged as square formation code；The row encryption subsystem is encrypted and obtains new square formation line by line using secret key code other side horizontal and vertical parity check code
Code；The row encryption subsystem is encrypted by column using secret key code to new square formation code；The square formation expansion subsystem, which reuses, to be prolonged
Slow technology deploys square formation code, obtains the sequence ciphertext of two dimensional encryption.
The inverse process of the present invention can then be realized to be decrypted to the two dimension of signal.
Further, the optical signal two dimension enciphering/deciphering system has two subsystems, is encryption subsystem and decryption respectively
System, encryption subsystem are divided into square formation arrangement subsystem, row encryption subsystem, row encryption subsystem and square formation expansion subsystem again
Four parts；Decrypting subsystem includes square formation arrangement subsystem, row decrypting subsystem, row decrypting subsystem, square formation expansion subsystem
System.
In the encryption subsystem, original text sequence code is arranged into square matrix code, and square matrix code is reduced to sequence code,
Realized using time-delay technique；Row encryption and row encryption are realized to square matrix code, using time lens imaging system to sequence
The inverting of row code realizes that the pump light in time lens imaging system plays the part of the function of key, utilize 0 yard in pump light sequence
With 1 yard of stochastic behaviour so that whole square matrix code is encrypted according to two dimensions of rows and columns；In the decrypting subsystem, add
Close square matrix code again under effect, is decrypted in same pump light sequence flows, reverts to original sequence code stream.
The time lens imaging system enters to square matrix code in every trade encryption and row ciphering process, to control pumping light pulse
Width, a pump light pulsewidth is set to cover the optical signal duration of whole row/column, so as to realize full line/column signal inverting
Encryption and decryption.
The present invention technical concept be：In time lens imaging system, as φ "2=-φ "1When, multiplication factor M=-1,
Now the output signal of time lens imaging system realizes temporal inverting relative to input signal.
Beneficial effects of the present invention are embodied in：Pump light random sequence stream is also made while time lens effect is realized
The cryptographic operation to signal sequence is realized for key, square matrix code can be expert at by two such time lens imaging systems
It is encrypted with two dimensions of row, substantially increases the confidentiality of optical transmission system, reduce the risk being cracked.
Brief description of the drawings
Fig. 1 is the system composition of the present invention, by delay technology arrangement is square matrix code to original text sequence code, time lens into
As system carries out stochastic inverse to square matrix code by row, obtain one-dimensional encryption, time lens imaging system again to square matrix code by arrange into
Row stochastic inverse, obtains two dimensional encryption.Finally, square matrix code is converted into ciphertext sequence again by delay technology, that is, realized
To the two dimensional encryption process of flashlight；Conversely, it can then realize the two-dimentional decrypting process to flashlight.
Fig. 2 is the fundamental diagram of time lens imaging system, and in Fig. 2 (a), its is suitable after imaging for a pair of light pulses
Sequence is inverted, if multiple pulse trains, is then put in order and is inverted completely, realize the encryption of signal.Fig. 2 (b)
In, the sequence signal that inverts again pass by inversion recovery to it is initial when signal condition, realize the decryption to signal.
Fig. 3 is that a pair of light pulses that pulsewidth is 5ps, spacing is 10ps are anti-to occurring after elapsed time lens imaging system
The simulation calculation figure drilled.
Fig. 4 is that time lens imaging system carries out two dimensional encryption to 16 random signal train streams 1100101001010011
Simulation calculation figure, wherein, Fig. 4 (a) is that invertings occur for four codes of the 1st row, and invertings, Fig. 4 occur for four codes of the 4th rows of Fig. 4 (b)
(c) inverting occurs for four codes of the 2nd row, and inverting occurs for four codes of the 4th row of Fig. 4 (d).
Embodiment
By embodiment, the invention will be further described below in conjunction with the accompanying drawings, but protection scope of the present invention is simultaneously
Not limited to this.
1~Fig. 4 of reference picture, a kind of optical signal two dimension enciphering/deciphering system based on time lens imaging, the system include side
Battle array arrangement subsystem, row encryption subsystem, row encryption subsystem and square formation expansion subsystem；The square formation arrangement subsystem uses
Sequence code original text is arranged as square formation code by delay technology；The row encryption subsystem is added line by line using secret key code other side's horizontal and vertical parity check code
It is close to obtain new square formation code；The row encryption subsystem is encrypted by column using secret key code to new square formation code；The square formation deploys subsystem
System, which reuses delay technology, deploys square formation code, obtains the sequence ciphertext of two dimensional encryption.
The inverse process of the present invention can then be realized to be decrypted to the two dimension of signal.
Further, the optical signal two dimension enciphering/deciphering system has two subsystems, is encryption subsystem and decryption respectively
System, encryption subsystem are divided into square formation arrangement subsystem, row encryption subsystem, row encryption subsystem and square formation expansion subsystem again
Four parts；Decrypting subsystem includes square formation arrangement subsystem, row decrypting subsystem, row decrypting subsystem, square formation expansion subsystem
System.
In the encryption subsystem, original text sequence code is arranged into square matrix code, and square matrix code is reduced to sequence code,
Realized using time-delay technique；Row encryption and row encryption are realized to square matrix code, using time lens imaging system to sequence
The inverting of row code realizes that the pump light in time lens imaging system plays the part of the function of key, utilize 0 yard in pump light sequence
With 1 yard of stochastic behaviour so that whole square matrix code is encrypted according to two dimensions of rows and columns；In the decrypting subsystem, add
Close square matrix code again under effect, is decrypted in same pump light sequence flows, reverts to original sequence code stream.
The time lens imaging system enters to square matrix code in every trade encryption and row ciphering process, to control pumping light pulse
Width, a pump light pulsewidth is set to cover the optical signal duration of whole row/column, so as to realize full line/column signal inverting
Encryption and decryption.
In the present embodiment, the row encryption is completed with row encryption subsystem by time lens imaging system, works as the time
When pump light in lens imaging system is 0 yard, time lens effect does not occur, and all yards of holdings of the row/column are constant；Work as pump
When Pu light is 1 yard, time lens effect occurs, and inverting sequence occurs for all yards of sequences of the row/column, and pump light leads to as key
The bidimensional ciphering process by rows and columns is crossed, realizes the complication encryption to original text sequence code.
Time lens imaging system used in the present embodiment, by input section optical fiber, time lens and deferent segment optical fiber
Three parts are formed, and wherein time lens are realized by FWM effects in high non-linearity medium of pump light and flashlight.Time
Lens imaging subsystem is characterised by the 2nd order chromatic dispersion amount of deferent segment optical fiber with input section optical fiber on the contrary, i.e. φ "2=-φ "1,
Now M=-1.When the time, lens effect truly occurred, the under operation to input optical signal can be realized；When time lens
When effect is not present, inverting does not occur for optical signal.Being present in for time lens effect is no, depending on pump light whether there is.
In all 1 yard of periods in pump light sequence flows, time lens effect occurs, and signal is inverted, in pump light sequence flows
In all 0 yard of periods, time lens effect is not present, and signal does not change.
Reference picture 2, to meetImage-forming condition, the parameter of two time lens imaging subsystems selects
It is selected as：β2s=20ps2/ km, Ls=1km, β2i=-20ps2/ km, Li=1km, β2p=20ps2/ km, Lp=1km.Now, φ "2
=-φ "1, M=-1.
It is T that Fig. 3, which illustrates pulsewidth,0=5ps, spacing are Δ T=10ps a pair of light pulses in elapsed time lens imaging
There occurs temporal inverting after system.
Fig. 1 and 4 elaborates that the detailed process of two dimensional encryption occurs by the system for original text sequence flows.Original text sequence is：
1100101001010011, it is arranged as square formationKey (i.e. pump light random sequence) is 1001, when pump light is 1 yard
When, inverting just occurs for the sequence of symhols of the row, i.e. inverting occurs for the 1st row and the 4th row, and the 2nd row keeps constant with the 3rd row, because
Square matrix code is changed into after this is encrypted through spaceThen ranks encryption, key (i.e. pump light random sequence) are entered to square matrix code
For 0101, the 1st row keep constant with the 3rd row, and the 2nd row are changed into the 4th row generation inverting, square matrix codeAgain by postponing skill
Art is converted to sequence code i.e.：0110111100001001, so far, complete the two dimensional encryption process to sequence code.Decrypting process
In contrast, it is worth mentioning at this point that, identical key must be used with ciphering process in decrypting process, just can guarantee that signal is complete
Recover entirely.
In the above-described embodiments, core concept is that it is complicated to improve encryption using two dimension encryptions of row and column to square matrix code
Degree, reduces the risk being cracked.When wherein the signal sequence is converted to square matrix code by delay technology, the line number of matrix and
Columns can be according to circumstances changed, and except being converted into 4X4, can also be converted to the matrix of other dimensions.In time lens
During imaging, it is necessary to allow a Pump duration to be fully contemplated by the signal sequence of whole row or column, signal sequence could be realized
Refutation process.
Using process contrary to the above, you can realize the decrypting process to ciphertext.
Claims (5)
- A kind of 1. optical signal two dimension enciphering/deciphering system based on time lens imaging, it is characterised in that：The system is arranged including square formation Cloth subsystem, row encryption subsystem, row encryption subsystem, square formation expansion subsystem；The square formation arrangement subsystem is using delay Sequence code is arranged as square formation code by technology；Acquisition is encrypted newly using secret key code other side horizontal and vertical parity check code in the row encryption subsystem line by line Square formation code；The row encryption subsystem is encrypted by column using secret key code to new square formation code；The square formation expansion subsystem is sharp again Square formation code is deployed with delay technology, obtains the sequence code of two dimensional encryption.
- 2. the optical signal two dimension enciphering/deciphering system based on time lens imaging as claimed in claim 1, it is characterised in that：It is described Optical signal two dimension enciphering/deciphering system has two subsystems, is encryption subsystem and decrypting subsystem respectively, and encryption subsystem divides again Deploy four parts of subsystem for square formation arrangement subsystem, row encryption subsystem, row encryption subsystem and square formation；Decrypting subsystem Including square formation arrangement subsystem, row decrypting subsystem, row decrypting subsystem and square formation expansion subsystem.
- 3. the optical signal two dimension enciphering/deciphering system based on time lens imaging as claimed in claim 2, it is characterised in that：It is described In encryption subsystem, original text sequence code is arranged into square matrix code, and square matrix code is reduced to sequence code, using time delay Technology is realized；Row encryption and row encryption are realized to square matrix code, using inverting of the time lens imaging system to sequence code come Realize, the pump light in time lens imaging system plays the part of the function of key, random with 1 yard using 0 yard in pump light sequence Characteristic so that whole square matrix code is encrypted according to two dimensions of rows and columns；In the decrypting subsystem, the square matrix code of encryption exists Again under effect of same pump light sequence flows, is decrypted, reverts to original sequence code stream.
- 4. the optical signal two dimension enciphering/deciphering system based on time lens imaging as claimed in claim 3, it is characterised in that：It is described Time lens imaging system enters to square matrix code in every trade encryption and row ciphering process, to control pumping light impulse length, make one Pump light pulsewidth can cover the optical signal duration of whole row/column, so as to realize the encryption and decryption of full line/column signal inverting.
- 5. time lens imaging system as claimed in claim 4, it is characterised in that：The time lens imaging system is by inputting Section optical fiber, time lens and deferent segment optical fiber are formed, the 2nd order chromatic dispersion amount φ " of the deferent segment optical fiber2With input section optical fiber 2nd order chromatic dispersion amount φ "1On the contrary, i.e. φ "2=-φ "1；The multiplication factor M=φ " of the time lens imaging system2/φ″1=- 1, so as to realize the inverting to 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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