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A Dynamic Serial Key Distribution Method Based on ghz State

A key distribution and dynamic technology, applied in the field of quantum information security

Inactive Publication Date: 2021-01-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to solve the problems existing in existing protocols, the purpose of the present invention is to improve the efficiency of quantum key distribution, reduce the bit error rate, and carry out efficient quantum dialogue

Method used

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  • A Dynamic Serial Key Distribution Method Based on ghz State
  • A Dynamic Serial Key Distribution Method Based on ghz State
  • A Dynamic Serial Key Distribution Method Based on ghz State

Examples

Experimental program
Comparison scheme
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specific Embodiment

[0075] We take a key with a length of 4 as an example to illustrate, each A in this protocol i , B i , C i The particle sending directions are as follows:

[0076]

[0077]

[0078]

[0079] Suppose three user sets are

[0080] Alice={Alice t1 |t1=1,2,3}, Bob={Bob t2 |t2=1,2,3},

[0081] Charlie={Charlie t3 |t3=1,2}. Each user to each A i , B i , C i The single-bit operation or measurement results of the particles are shown in Table 2 to Table 4:

[0082]

[0083] Table 2

[0084]

[0085] table 3

[0086]

[0087] Table 4

[0088] Afterwards, the third-party Dick sends a request to obtain the key to the three user sets Alice, Bob, and Charlie. The user set Alice and Bob agree to publish the operation process or measurement results to the third-party Dick, while the user set Charlie refuses to publish the operation to the third-party Dick. process or measurement result. According to Table 2 ~ Table 3, Dick can get the particle A 1 ,A 2 ,A 3 ...

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Abstract

The invention provides a dynamic serial key distribution method based on GHZ states. In the method, firstly, an original party randomly generates a binary string K<n>={k<1>,k<2>...k...k<n>}(k belongs to {0,1}, the length of which is n, and takes the binary string as the original key; according to an appointed rule, n three-particle GHZ states are prepared in sequence according to the value of k (i=1,2...n); particles in each GHZ state are taken out in sequence, so that three GHZ particle sequences, the lengths of which are n, are formed; a key sharing party comprises three key sharing user sets; each user set comprises several sharing user parties; and each key sharing user set corresponds to a GHZ particle sequence. Visually, the protocol has a user threshold value; namely, matching of all parties is unnecessary; a key can be obtained only in need of matching of all users in two specific user sets; in addition, the length of the key and the number of users are arbitrary; the users can be dynamically increased; furthermore, the protocol only relates to single-bit measurement and single-bit operation; and thus, the protocol is easily realized.

Description

technical field [0001] The invention belongs to the field of quantum information security and relates to a quantum security communication protocol, in particular to a serial key distribution protocol with dynamically adjustable number of users. Background technique [0002] With the development of quantum information technology, encryption methods based on traditional cryptography will become more and more insecure. For example, quantum computers have the ability to quickly decompose prime factor algorithms, so the existing ciphers will no longer be safe. An effective encryption method is a quantum key distribution scheme based on the principles of quantum physics. Quantum cryptography based on quantum mechanics was first proposed by S.J.Wiesner of the United States [1] In 1970, S.J.Wiesner proposed two works based on quantum mechanics, one is to use a single quantum state to make unforgeable "electronic banknotes", and the other is to use quantum states to transmit message...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04L9/16
CPCH04L9/08H04L9/085H04L9/16
Inventor 姜敏方盛晖王宏基黄旭周刘蕾
Owner SUZHOU UNIV
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