Digital signature system and method based on discrete modulation CV-QKD

Abstract

The invention discloses a digital signature system and method based on discrete modulation CV-QKD. The method comprises the following steps: generating a secret key; generating a digital signature; and verifying the digital signature. According to the method, a new hash function is generated every time the first hash value is generated, the generated first hash value and the character string formed by each coefficient except the highest term in the irreducible polynomial are combined with the secret key to perform the XOR encryption operation to obtain the signature, the length of the message is not limited when the first hash value is generated, each round of signature can sign messages of any length, and the signature efficiency is very high; the security key is generated by adopting a discrete modulation CV-QKD mode, and can be implemented by adopting equipment compatible with classical optical communication without additional instruments, so that large-scale deployment on a current optical communication network is facilitated; the security key is generated in a QKD mode, and unconditional security can be guaranteed while multi-bit messages are signed in a round of signature.

Description

technical field [0001] The invention relates to the technical field of quantum digital signatures, in particular to a digital signature system and method based on discrete modulation CV-QKD. Background technique [0002] The two most important tasks in classical cryptography are encryption and decryption of information and digital signatures. Encryption and decryption ensure the confidentiality of information, and digital signatures ensure the integrity of information, preventing information from being tampered with and repudiated. The security of classical cryptography tasks is based on the complexity of solving mathematical problems, such as large number decomposition problems, elliptic curve problems, etc. With the advancement of quantum algorithms and quantum computers, the security of digital signature protocols based on computational complexity will be threatened. [0003] Quantum key distribution combined with one-time pad to perform quantum secure communication tas...

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the invention is to provide a digital signature system and method based on discrete modulation CV-QKD, which solves the problem that the efficiency of existing quantum digital signatures is very low, and each round of signatures can only sign one bit of data to generate a signature The problem of consuming a large amount of communication resources; at the same time, it also solves the problem that the existing quantum digital signature has strict requirements on instruments and is difficult to deploy on a large scale

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