Quantum digital signature and quantum digital signcryption method

Abstract

The invention discloses a quantum digital signature and a quantum digital signcryption method. The quantum digital signature comprises the following steps: generating a secret key; generating a digital signature; and verifying the digital signature. The security of the hash function used in the signcryption or signature process is ensured by the irreducible polynomial and the hash function key serving as the input random number, and the irreducible polynomial depends on the local random number and cannot be known by a receiver and a signature verification party in advance before the signcryption or signature process; in other words, the unconditionally secure hash function is used so that the security of the whole signcryption or signature process is ensured, and the security risk caused by leakage of a fixed irreducible polynomial in other signatures is directly avoided; and moreover, the length of the message is not limited when the hash value is generated, the message with any length can be signed or signcrypted in each round of signature or signcryption, and the signature or signcryption efficiency is very high.

Description

technical field [0001] The invention relates to the technical field of quantum security, in particular to a quantum digital signature and a quantum digital signcryption method. Background technique [0002] Encryption and digital signatures are two basic cryptographic tools for ensuring confidentiality, integrity, authenticity, and non-repudiation. In the asymmetric key system, the traditional method is to digitally sign the message first, and then encrypt the output (sign-then-encryption), which may have two problems: the low efficiency of this superposition scheme and the cost High, and there are situations where neither scheme can guarantee security. Signcryption can complete digital signature and encryption functions in one logical step. Compared with traditional sign-then-encryption, it can effectively reduce computing power consumption and communication loss, and provide digital signature in a more efficient way and properties of encryption schemes. [0003] However...

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Problems solved by technology

[0006] Purpose of the invention: The purpose of the invention is to provide a quantum digital signature and quantum digital signcryption method, which solves the threat to the security of the classical digital signcryption protocol at this stage. Many early hash functions and public key algorithms have been Being broken, and the emergence of quantum computers in the future will pose a fatal threat to the algorithm security of the current digital signcryption protocol; at the same time, it solves the problem that the leakage of fixed irreducible polynomials in the efficient quantum digital signature scheme will lead to security risks; it also solves the problem of The current digital signature or signcryption protocol is inefficient, consumes more resources, and generates a signature that consumes a lot of communication resources.

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