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High-efficiency quantum digital signature method and system

A quantum digital signature and high-efficiency technology, applied in the field of high-efficiency quantum digital signature methods and systems, can solve the problems of resource waste and low efficiency, and achieve the effect of reducing loss and reducing communication resource waste

Active Publication Date: 2021-03-09
NANJING UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Purpose of the invention: In order to solve the shortcomings of the existing quantum digital signature protocol that is not efficient and will cause a lot of waste of resources in the case of channel asymmetry, the present invention proposes a high-efficiency quantum digital signature method and system, through non-orthogonal Quantum state sending, receiving, and post-matching of data realize high-efficiency and unconditionally secure quantum digital signatures, and are applicable to scenarios where the channels between the message signature module-message authentication module and the message signature module-message verification module are symmetric or asymmetric

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  • High-efficiency quantum digital signature method and system

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Embodiment 1

[0045] figure 1 An exemplary quantum digital signature system for implementing the method described in Embodiment 1 is given, including a message signature module, a message authentication module, and a message verification module connected through an insecure quantum channel.

[0046] Such as figure 1 As shown, this embodiment considers the situation that the channels of message signature module-message authentication module and message signature module-message verification module are symmetrical, and the devices of message authentication module and message verification module are the same. The message signature module uses a continuous laser to generate phase-randomized weakly coherent state pulses, and uses phase modulators, intensity modulators, polarization modulators, and signal attenuators to perform phase randomization, decoy state modulation, and polarization encoding, respectively. The intensity modulator can modulate the pulse into the light intensity of {μ, v, ω}....

Embodiment 2

[0091] This embodiment considers the channel asymmetry between message signature module-message authentication module and message signature module-message verification module. At this time, the remaining steps of the signature scheme are the same as those in Embodiment 1, except that: in the case of asymmetric distances, an asymmetric light intensity is selected with an asymmetric probability to prepare a quantum state. For example: the distance between the message signature module and the message authentication module is L B , and the distance between the message signature module and the message verification module is L C ; The message signature module starts with The probability of selecting light intensity {μ B , v B , ω B} send N B pulses to the message authentication module to The probability of selecting light intensity {μ C , v C , ω C} send N C pulses to the message verification module. In the above process, the probability of the light intensity selecte...

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Abstract

The invention provides a high-efficiency quantum digital signature method and system, and the method comprises the steps that a message signature module prepares two different quantum state sequenceswith the same length, and transmits the two different quantum state sequences to a message authentication module and a message verification module; and then a data post-matching method is adopted to associate the quantum state sequences received by the message authentication module and the message verification module, and the condition that the message authentication module and the message verification module need to respond to a single pulse sent by the message signature module at the same time is removed. By adopting the scheme provided by the invention, the quantum states received by the message authentication module and the message verification module can be completely used for code forming after being matched, so that the key loss is reduced; in addition, the message signature modulecan separately select the pulse parameters sent to the other two modules and the length of the sent quantum state sequence, and can be implemented in a scene with asymmetric channels.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a high-efficiency quantum digital signature method and system. Background technique [0002] Digital signature is an important means of ensuring information security, which can ensure information integrity, non-tampering and non-repudiation. Digital signature protocols in classical cryptography are usually based on various cryptographic protocols based on computational complexity problems, such as public key encryption algorithm RSA, advanced encryption standard AES, etc. Due to the inherent parallel characteristics of quantum computing, with the major breakthroughs in mathematical algorithms and the rapid development of quantum computers, the security of various traditional cryptography protocols has been greatly challenged. Therefore, classical digital signature protocols are no longer safe. With the rapid development of quantum computing, quantum digital signatures will b...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L9/32H04L29/06
CPCH04L9/0858H04L9/3247H04L9/3263H04L63/0869
Inventor 尹华磊陆玉硕陈增兵
Owner NANJING UNIV
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