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Quantum digital signature system and method based on polarization coding

A quantum digital signature and encoding technology, applied in digital transmission systems, transmission systems, and key distribution, can solve the problems of low quantum digital signature efficiency, inability to guarantee security, and consumption of large communication resources, so as to ensure unconditional security and guarantee unconditional Safety, usability-enhancing effects

Active Publication Date: 2021-12-17
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a quantum digital signature system and method based on polarization coding, which solves the problem that the current general digital signature scheme is based on an asymmetric cryptosystem , with the development of quantum computers, it will gradually fail to guarantee security; while the efficiency of existing quantum digital signatures is very low, each round of signatures can only sign one bit of data, and generating signatures consumes a lot of communication resources

Method used

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  • Quantum digital signature system and method based on polarization coding
  • Quantum digital signature system and method based on polarization coding
  • Quantum digital signature system and method based on polarization coding

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Embodiment 1

[0033] Such as figure 1 As shown, a quantum digital signature system based on polarization coding in the present invention includes a sending end, a receiving end and a verification end, the sending end includes a first quantum communication unit 1 and a first classical processing unit 2 connected to each other, and the receiving end includes a mutual The second quantum communication unit 3 and the second classical processing unit 4 connected, the verification end includes the third quantum communication unit 5 and the third classical processing unit 6 connected to each other; wherein between the quantum communication units of the sending end and the receiving end, the sending end The quantum communication unit at the verification end is connected through a quantum channel (the black dotted line in the figure), between the classical processing units at the sending end and the receiving end, between the classical processing units at the sending end and the verification end, and ...

Embodiment 2

[0066] Such as image 3 As shown, this embodiment is basically the same as Embodiment 1, the difference lies in the structure of the polarization encoding module 13:

[0067] The polarization encoding module 13 includes a third beam splitter 135 and a third phase modulator 136, the input end of the third beam splitter 135 is connected to the first optical transmission module 12, and the transmission output end of the third beam splitter 135 is connected to the third The input end of the phase modulator 136 is connected, and the reflection output end of the third beam splitter 135 is connected with the output end of the third phase modulator 136; The third beam splitter 135 is a polarization maintaining polarization beam splitter, and the third phase modulator 136 is a phase modulator, and the structure as a whole forms a bidirectional sagnac ring. The |H> state transmitted by the third beam splitter 135 will add a phase to the third phase modulator 136, and the |V> state of re...

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Abstract

The invention discloses a quantum digital signature system and method based on polarization coding, and the method comprises the steps: generating a key string for each signature of the quantum digital signature system, generating a hash function through a part of keys randomly selected in the key string and a random number obtained in a random number generator, inputting a message into the hash function to generate a first hash value, selecting a part of keys from the remaining keys to perform XOR encryption operation on the first hash value and a character string formed by each coefficient except the highest term in the irreducible polynomial to obtain a signature; in the process, the hash function is updated in each signature, and the length of the message is not limited, so that the consumed communication resources are limited, the digital signature efficiency is improved, and the practicability is enhanced; meanwhile, the security key is generated by adopting a polarization coding BB84 protocol mode, the unconditional security of the key is ensured on the level of physical principle, and the digital signature generated by utilizing the unconditional security key further ensures the unconditional security.

Description

technical field [0001] The invention relates to the field of quantum communication security, in particular to a quantum digital signature system and method based on polarization coding. Background technique [0002] Digital signature technology is an important protection technology for information security. Digital signature technology can be used to check whether the information content has been changed during the transmission of information in the channel. This property allows it to be used to ensure the integrity and authenticity of data; Fang can't deny the news in front of this technology, which is also the origin of the name "signature". The current digital signature technology is based on asymmetric cryptosystems, but asymmetric cryptosystems such as RSA are based on mathematical complexity to ensure security. Originally based on the existing level of computing power, these cryptosystems cannot be cracked within an effective time. However, with the development of qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L9/32
CPCH04L9/0852H04L9/3247H04L9/3236
Inventor 尹华磊白峻林富尧
Owner NANJING UNIV
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