Quantum digital signature and quantum digital signcryption method

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 signc