Quantum digital signature method for untrusted center

Abstract

The invention discloses a quantum digital signature method for an untrusted center. The method comprises a distribution phase comprising the following steps: a, a sender operates on an original text to acquire a reduced original text; b, the sender generates signatures and respectively sends the signatures to a receiver and a verifier, wherein the quantity of the signatures is worked out according to a bit number of the reduced original text; and c, the receiver and the verifier mutually exchange a part of the owned signatures; and a verification phase comprising the following steps: d, the sender sends the original text and the signatures generated in the step b to the receiver; e, the receiver operates on the original text to acquire the reduced original text, compares the signatures received in the step d with the owned signatures after exchange in the step c for verification aiming at each bit of the reduced original text; and f, after the verification is passed, the receiver sends the original text and the signatures received in the step d to the verifier for verification. According to the method provided by the invention, consumption of quantum keys and pressure of quantum communication equipment are greatly reduced by reducing the length of the original text.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a quantum digital signature method without a trusted center. Background technique [0002] Digital signature technology is generally used to prove the identity of the digital information sender and the authenticity of the digital information itself, such as digital information in financial services, software updates, and legal contracts. More importantly, the digital signature guarantees the transmittability of the message, that is, the message is forwarded again after being received, and the forwarded person still thinks it is valid. The current mainstream digital signature technology uses public key encryption algorithm. [0003] The classic digital signature algorithm is based on the computational complexity of mathematical algorithms. Due to the computational complexity and no strict theory to prove its security, coupled with the increasing computing power of t...

AI Technical Summary

Problems solved by technology

[0021] The invention provides a quantum digital signature method, which overcomes the problem that a single-bit signature requires a large number of keys, and greatly reduces the consumption of quantum keys and the pressure on quantum communication equipment by reducing the length of the original text

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