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Quantum agent blind signature method and system based on cluster state

A technology of proxy signature and proxy blindness, which is applied in transmission system, digital transmission system and key distribution, can solve the problem of low security

Active Publication Date: 2019-08-23
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a quantum proxy blind signature method and system based on the cluster state to solve the problem of low security of the quantum proxy blind signature method in the prior art

Method used

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  • Quantum agent blind signature method and system based on cluster state
  • Quantum agent blind signature method and system based on cluster state
  • Quantum agent blind signature method and system based on cluster state

Examples

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Embodiment 1

[0093] In this embodiment, a quantum proxy blind signature method based on the cluster state is disclosed. The method includes five communication parties, namely Alice, the message owner who holds the information to be signed, Bob, the initial signer who cannot sign normally, and the proxy The signer Bob1, the proxy signer Bob2, and the trusted receiver Charlie.

[0094] The quantum proxy blind signature scheme provided by the present invention includes 5 legal communication parties. Alice is the message owner, and her document needs to be signed by the initial signer, Bob. However, Alice wants Bob to be ignorant of the contents of her file, i.e. to achieve blindness in the signature scheme. If Bob is unable to complete the signing of Alice's initial message for some reason at this time, Bob can authorize the proxy signer group (Bob1 and Bob2) to perform the signature on his behalf during Bob's absence. Two proxy signers, Bob1 and Bob2, obtain proxy credentials from Bob. On...

Embodiment 2

[0191] Based on the method in Embodiment 1, this embodiment discloses a cluster state-based quantum proxy blind signature system for implementing the method in Embodiment 1. The system includes Alice, the message owner who stores the information to be signed, and cannot normally Signed initial signer Bob, proxy signer Bob1, proxy signer Bob2, and trusted receiver Charlie.

[0192] The message owner Alice, the initial signer Bob, the proxy signer Bob1, the proxy signer Bob2 and the trusted receiver Charlie are used to realize the following functions:

[0193] (I) The initial signer Bob distributes the key to the message owner Alice and the initial signer Bob through the four-particle GHZ state sequence, and the message owner Alice obtains the key k A , the initial signer Bob obtains the key k B ;

[0194] Proxy signer Bob1 and proxy signer Bob2 obtain keys through the quantum key distribution protocol

[0195] Optionally, the initial signer Bob distributes the key to the m...

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Abstract

The invention discloses a quantum agent blind signature method and system based on a cluster state. The cluster state is used as a carrier of a quantum blind signature. The GHZ state is only used forkey distribution. The method comprises five communication parties, respectively a message owner Alice holding to-be-signed information, an initial signing party Bob which cannot sign normally, an agent signing party Bob1, an agent signing party Bob2 and a trusted receiver Charlie. Bob can authorize a proxy signature crowd group, and during the Bob vacancy period, an agent signature person represents the Bob to execute signature. Only when two agent signers Bob1 and Bob2 cooperate with each other, can the Bob be represented to generate a signature, the Charlie is an authorized and credible receiver, and the Charlie receives an Alice file and verifies whether the signature on the file is completed by the cooperation of the two agent signers. According to the quantum agent blind signature method based on the cluster state provided by the invention, on the basis of keeping the GHZ state and the W state of the cluster state, greater entanglement continuity is achieved, and the safety is higher.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a cluster state-based quantum proxy blind signature method and system. Background technique [0002] Compared with handwritten signatures, digital signatures are also a secure signature method. Classical digital signatures are widely used in many fields such as e-government, e-commerce, and electronic communications. However, the security of digital signature schemes based on classical ciphers mostly depends on Due to the computational complexity of some mathematical problems, the existing technology also provides a quantum signature method. The quantum signature method can effectively overcome and solve some security problems of classical digital signatures. Among them, the quantum proxy blind signature is more secure in the quantum signature method. A signature method, quantum proxy blind signature refers to the combination of proxy signature and blind signature, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32H04L9/08
CPCH04L9/0852H04L9/3257
Inventor 张明慧王家耀岳林阳
Owner NORTHWEST UNIV(CN)
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