Quantum secret sharing method and system without monitoring channel

Abstract

The invention provides a quantum secret sharing method and system without a monitoring channel, and the method comprises the steps: two transmitting ends prepare a bit string with the length of L, enabling the generated bit string information to be coded on the phase of a quantum state with the dimension of L, and transmitting a quantum state sequence to a receiving end; the receiving end performsshift type interference measurement on the two paths of quantum state sequences, generates an original secret key according to a measurement result, and then publishes the positions of the quantum states which are responded under effective measurement to the two sending ends respectively; the two receiving ends find out corresponding bits from own bit strings as original keys according to the positions of the quantum states; and finally, classical error correction, error verification and privacy amplification are performed by the three parties, and finally extracting is performed to obtain akey for quantum secret sharing. According to the method, the requirement of channel monitoring is removed, and theoretically the highest 50% system bit error rate can be tolerated, so that the deviceand the implementation program of the quantum secret sharing scheme are simpler.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a method and system for sharing quantum secrets without monitoring channels. Background technique [0002] Secret sharing is the most basic multi-party encryption method, which plays a fundamental role in the modern information society. It provides basic security guarantees for many applications, such as secure multi-party computing, blockchain, cloud storage, cloud computing, etc. . A secret sharing scheme divides one user's (called the dominant party) secret message into many parts and securely distributes them to other users in the group (called the receivers). No receiver can obtain the message alone, and only a few receivers can cooperate to obtain the message. With the development of quantum communication technology, secret sharing based on quantum key has also been widely developed in theory and experiment. [0003] In recent years, the secure coding rate of the qua...

AI Technical Summary

Problems solved by technology

However, the existing quantum cryptography sharing schemes all obtain the information obtained by detecting and misestimating the attacker, that is to say, obtaining a safe coding rate by monitoring the channel. Therefore, it has the following defects: On the one hand, the requirement of channel monitoring Make the quantum secret sharing system and execution operation more complicated; Many lead to a high detection error rate itself, which will make the estimated information value obtained by the attacker too large to generate a secure code rate, making it difficult for the quantum cryptography sharing scheme to be widely implemented

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