CN109687964A - A kind of new types of data coordination approach for continuous variable quantum key distribution - Google Patents
A kind of new types of data coordination approach for continuous variable quantum key distribution Download PDFInfo
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- CN109687964A CN109687964A CN201910121110.6A CN201910121110A CN109687964A CN 109687964 A CN109687964 A CN 109687964A CN 201910121110 A CN201910121110 A CN 201910121110A CN 109687964 A CN109687964 A CN 109687964A
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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
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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- H—ELECTRICITY
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- 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
- H04B10/70—Photonic quantum communication
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Abstract
The invention discloses a kind of new types of data coordination approach for continuous variable quantum key distribution, transmitting terminal and the amplitude classifier of receiving end classify to garbled data, and the data discrete processing unit of receiving end passes to transmitting terminal after carrying out sliding-model control to classification data；The discrete data that the data discrete processing unit of transmitting terminal is sent according to receiving end passes to discrete data storage unit after carrying out sliding-model control to classification data；Verification subdata is calculated in the syndrome computation unit of receiving end, and is sent to transmitting terminal；The decoding computing unit of transmitting terminal carry out decoding be calculated decoding result pass to receiving end；The key recomposition unit of transmitting terminal and receiving end carries out key recombination and integration to decoding result data, then passes to private key amplifying unit, obtains final key data.The present invention improves the code rate of error correction, to improve the general safety code rate and decoding efficiency of CV-QKD system using a kind of method for being segmented error correction.
Description
Technical field
The present invention relates to a kind of new types of data coordination approach for continuous variable quantum key distribution.
Background technique
With the development of quantum calculation technology, it is hidden that the classical cryptosystem based on computation complexity faces great safety
Suffer from.Quantum key distribution (Quantum Key Distribution, QKD) is a kind of key distribution based on quantum physics principle
System has Unconditional security, causes extensive concern and research.
Quantum key distribution technology is broadly divided into discrete variable quantum key distribution (Discrete Variable
Quantum key Distribution, DV-QKD) and continuous variable quantum key distribution (Continuous Variable
Quantum Key Distribution, CV-QKD) two classes.Compared to DV-QKD, CV-QKD has potential code rate height, does not need
The advantages that single-photon detector and good classical Networks of Fiber Communications amalgamation, it is considered to be the technical solution of great application prospect.
CV-QKD system is needed to realize that recipient and sender share identical key by after data
Reason carries out data agreement.However, faint quantum signal is after long-distance optical fiber transmits, signal-to-noise ratio is very low, leads to key point
The sender of hair and the error rate of original data of recipient are very high, and error correction is extremely difficult, this is also that CV-QKD system is main
Technical bottleneck.
Low density parity check code (LDPC) is the mainstream technology means realizing CV-QKD system data and negotiating.For CV-
QKD limits the code rate of LDPC correction matrix since signal-to-noise ratio is low after optical fiber transmits for quantum signal.How in low noise
Code rate is improved than under the conditions of, so that the safe code rate for improving quantum key transmission is the important technology for restricting CV-QKD system performance
Problem.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the present invention provides a kind of for continuous variable quantum key distribution
New types of data coordination approach.
The technical solution adopted by the present invention to solve the technical problems is: a kind of for continuous variable quantum key distribution
The information exchange of the data processing module of new types of data coordination approach, transmitting terminal and receiving end and data processing include as flowed down
Journey:
Step 1: transmitting terminal and receiving end compare screening unit by base first, the identical garbled data of measurement base is obtained,
Then garbled data is passed into respective amplitude classifier；
Step 2: transmitting terminal and the amplitude classifier of receiving end classify to garbled data, then by classification results point
Supplementary biography passs respective data discrete processing unit；
Step 3: after the data discrete processing unit of receiving end carries out sliding-model control to classification data, by discrete data
It is delivered separately to transmitting terminal and next stage discrete data storage unit；The data discrete processing unit of transmitting terminal is sent out according to receiving end
After the discrete data sent carries out sliding-model control to classification data, it is single that discrete data is passed into the storage of next stage discrete data
Member；
Step 4: the syndrome computation unit of receiving end carries out syndrome computation according to discrete data and check matrix, obtain
To verification subdata, and it is sent to transmitting terminal；The decoding computing unit of transmitting terminal is according to discrete data, check matrix and syndrome
Data carry out decoding calculating, and decoding result is then delivered separately to receiving end and next stage decodes result data storage unit；
Step 5: the key recomposition unit of transmitting terminal carries out key recombination to decoding result data, then passes to private key and put
Big unit；The key recomposition unit of receiving end integrates discrete data, is transmitted further to private key and puts according to decoding result data
Big unit；
Step 6: transmitting terminal and the private key amplifying unit of receiving end determine pantograph ratio according to the safe code rate of real system
Example obtains final key data so that matching from the data that private key amplifying unit exports with safe code rate.
Compared with prior art, the positive effect of the present invention is:
The present invention proposes a kind of error correction scheme, by making full use of the amplitude distribution feature of CV-QKD signal, using one kind
The method for being segmented error correction, improves the code rate of error correction, to improve the general safety code rate and decoding efficiency of CV-QKD system.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is total system block diagram；
Fig. 2 is the principle framework figure of transmitting terminal data processing module A；
Fig. 3 is the functional block diagram of receiving end data processing module B.
Specific embodiment
As shown in Figure 1, for CV-QKD system.Transmitting terminal sends a signal to receiving end by signal transmitting module A, together
When the information of transmission passed into data processing module A.Receiving end is received from transmitting terminal by signal detection module B and is sended over
Signal, and pass it to data processing module B.
Data processing module A is by the signal transmitting module A data passed over and by carrying out information friendship with receiving end
The information mutually obtained carries out data processing, obtains key, is stored in cipher key storage block A.
Data processing module B is by the signal detection module B data passed over and by carrying out information friendship with transmitting terminal
The information mutually obtained carries out data processing, obtains key, is stored in cipher key storage block B.
Core of the invention is the information exchange and data processing design of data processing module A and data processing module B.
As shown in Figures 2 and 3, screening unit is compared by base first for data processing module, transmitting terminal and receiving end,
The identical part data of measurement base are obtained, respective amplitude classifier is passed it to.
Amplitude classifier classifies to the data after screening unit screening, according to classification negotiation data AB according to classification
As a result, being delivered separately to corresponding data discrete processing unit i.
In terms of classification, transmitting terminal is divided into n class (for example, amplitude fall in [0, a1) section according to the amplitude size of signal and is
1st class, amplitude fall in [a1, a2) for the 2nd class ..., it is the n-th class that amplitude, which is more than or equal to a_n-1), receiving end is according to the width of signal
It is the 1st class that value size, which is divided into n class (for example, amplitude fall in [0, b1) section, amplitude fall in [b1, b2) for the 2nd class,., amplitude
It is the n-th class more than or equal to b_n-1).It, can be in system in order to guarantee that corresponding i-th class of transmitting terminal is corresponding with the i-th class of receiving end
The debugging stage adjusts b1 ... the b_n-1 parameter of receiving end by test data, so that being located at the signal in i-th of section of transmitting terminal
Maximum probability also is located at identical i-th of section when receiving by channel receiving end, so that the section signal-to-noise ratio is stable as far as possible.
In actual motion, the b1 ... that receiving end is obtained according to the debugging stage, b_n-1 parameter classifies to data, and will classification
Coordination data is sent to transmitting terminal, and transmitting terminal amplitude classifier classifies to data according to the classification negotiation data received.
The data that the data discrete processing unit i of receiving end passes over amplitude classifier carry out sliding-model control, than
Disperse segmentaly such as can be used or multidimensional negotiates discretization, the data after discretization are then passed into discrete data storage
Unit i, and discretization negotiation data B is passed into transmitting terminal；The data discrete processing unit i of transmitting terminal negotiates according to discretization
Data B, the data that amplitude classifier is passed over carry out sliding-model control, the data after discretization are passed to discrete data
Storage unit i.
Receiving end, syndrome computation unit i pass through the information and verification square for passing over discrete data storage unit i
The information of battle array storage unit i carries out syndrome computation, obtains syndrome i, and be sent to transmitting terminal；The decoding of transmitting terminal calculates single
Discretization data that first i is passed over according to discrete data storage unit, check matrix storage unit i storage check matrix with
And the verification subdata passed over from receiving end carries out decoding calculating, is stored data into data according to decoding result and stores list
In first i, and decoding result is sent to receiving end.
Transmitting terminal key recomposition unit according to decoding as a result, in data storage cell data carry out key recombination, then
Private key amplifying unit is passed to, private key amplifying unit determines scaling according to the safe code rate of real system, so that from private key
The data of amplifying unit output are matched with safe code rate, obtain final key data.
The decoding result data that receiving end key recomposition unit is sended over according to transmitting terminal, by discrete data storage unit
Data integrated, be transmitted further to private key amplifying unit, obtain final key data.
Claims (5)
1. a kind of new types of data coordination approach for continuous variable quantum key distribution, it is characterised in that: transmitting terminal and reception
The information exchange of the data processing module at end and data processing include following process:
Step 1: transmitting terminal and receiving end compare screening unit by base first, the identical garbled data of measurement base is obtained, then
Garbled data is passed into respective amplitude classifier；
Step 2: transmitting terminal and the amplitude classifier of receiving end classify to garbled data, then classification results are passed respectively
Pass respective data discrete processing unit；
Step 3: discrete data is distinguished after the data discrete processing unit of receiving end carries out sliding-model control to classification data
Pass to transmitting terminal and next stage discrete data storage unit；What the data discrete processing unit of transmitting terminal was sent according to receiving end
After discrete data carries out sliding-model control to classification data, discrete data is passed into next stage discrete data storage unit；
Step 4: the syndrome computation unit of receiving end carries out syndrome computation according to discrete data and check matrix, school is obtained
Subdata is tested, and is sent to transmitting terminal；The decoding computing unit of transmitting terminal is according to discrete data, check matrix and verification subdata
Decoding calculating is carried out, decoding result is then delivered separately to receiving end and next stage decodes result data storage unit；
Step 5: the key recomposition unit of transmitting terminal carries out key recombination to decoding result data, then pass to private key amplification list
Member；The key recomposition unit of receiving end integrates discrete data according to decoding result data, and it is single to be transmitted further to private key amplification
Member；
Step 6: transmitting terminal and the private key amplifying unit of receiving end determine scaling according to the safe code rate of real system, make
It obtains and is matched from the data that private key amplifying unit exports with safe code rate, obtain final key data.
2. a kind of new types of data coordination approach for continuous variable quantum key distribution according to claim 1, special
Sign is: when being classified, garbled data is divided into n class according to the amplitude size of signal by the amplitude classifier of transmitting terminal,
In: amplitude fall in [0, a1) section is the 1st class, amplitude fall in [a1, a2) for the 2nd class, and so on, amplitude is more than or equal to a_n-
1 is the n-th class；Garbled data is divided into n class according to the amplitude size of signal by the amplitude classifier of receiving end, in which: amplitude is fallen in
[0, b1) section is the 1st class, amplitude fall in [b1, b2) for the 2nd class, and so on, it is the n-th class that amplitude, which is more than or equal to b_n-1,.
3. a kind of new types of data coordination approach for continuous variable quantum key distribution according to claim 2, special
Sign is: in the system debug stage by the parameter b1, b2 ..., b_n-1 of test data adjusting receiving end, sending so that being located at
Maximum probability also is located at identical i-th of section when the signal in i-th of section being held to receive by channel receiving end；In practical fortune
When row, the parameter b1 that the amplitude classifier of receiving end was obtained according to the debugging stage, b2 ..., b_n-1 classify to data, and
Classification negotiation data is sent to transmitting terminal, the amplitude classifier of transmitting terminal is according to the classification negotiation data received, to data
Classify.
4. a kind of new types of data coordination approach for continuous variable quantum key distribution according to claim 3, special
Sign is: the data discrete processing unit of receiving end and transmitting terminal, check matrix storage unit, is translated at discrete data storage unit
Code computing unit, decoding result data storage unit, syndrome computation unit, syndrome data storage cell are n.
5. a kind of new types of data coordination approach for continuous variable quantum key distribution according to claim 1, special
Sign is: the method that the data discrete processing unit of receiving end and transmitting terminal carries out sliding-model control to data includes that segmentation is discrete
Change or multidimensional negotiates discretization.
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| CN113839779A (en) * | 2021-11-29 | 2021-12-24 | 中国电子科技集团公司第三十研究所 | Private key amplification processing method, device, equipment and storage medium based on FHT |
| CN114629638A (en) * | 2022-03-10 | 2022-06-14 | 中国电子科技集团公司第三十研究所 | Multi-dimensional negotiation simplification method and device suitable for continuous variable quantum key distribution |
| CN114884658A (en) * | 2022-05-13 | 2022-08-09 | 中国电子科技集团公司第三十研究所 | Encrypted data negotiation method and device for discrete modulation CV-QKD and data post-processing system |
| CN115348010A (en) * | 2022-07-20 | 2022-11-15 | 中国电子科技集团公司第三十研究所 | Method and system suitable for eliminating residual error code in continuous variable quantum key distribution |
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| CN110808828A (en) * | 2019-09-26 | 2020-02-18 | 中国电子科技集团公司第三十研究所 | Multi-matrix self-adaptive decoding device and method for quantum key distribution |
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| CN113839779A (en) * | 2021-11-29 | 2021-12-24 | 中国电子科技集团公司第三十研究所 | Private key amplification processing method, device, equipment and storage medium based on FHT |
| CN113839779B (en) * | 2021-11-29 | 2022-03-18 | 中国电子科技集团公司第三十研究所 | Private key amplification processing method, device, equipment and storage medium based on FHT |
| CN114629638A (en) * | 2022-03-10 | 2022-06-14 | 中国电子科技集团公司第三十研究所 | Multi-dimensional negotiation simplification method and device suitable for continuous variable quantum key distribution |
| CN114629638B (en) * | 2022-03-10 | 2023-06-13 | 中国电子科技集团公司第三十研究所 | Multidimensional negotiation simplifying method and device suitable for continuous variable quantum key distribution |
| CN114884658A (en) * | 2022-05-13 | 2022-08-09 | 中国电子科技集团公司第三十研究所 | Encrypted data negotiation method and device for discrete modulation CV-QKD and data post-processing system |
| CN114884658B (en) * | 2022-05-13 | 2024-04-02 | 中国电子科技集团公司第三十研究所 | Encryption data negotiation method, device and data post-processing system of discrete modulation CV-QKD |
| CN115348010A (en) * | 2022-07-20 | 2022-11-15 | 中国电子科技集团公司第三十研究所 | Method and system suitable for eliminating residual error code in continuous variable quantum key distribution |
| CN115348010B (en) * | 2022-07-20 | 2024-04-26 | 中国电子科技集团公司第三十研究所 | Method and system suitable for eliminating residual error codes of continuous variable quantum key distribution |
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