Quantum key synchronizing system and synchronizing method based on multilevel relay

Abstract

The invention discloses a quantum key synchronizing system based on multilevel relay. The system comprises a quantum key management center and key relay nodes. The quantum key management center comprises a quantum key center server and a center key node. The quantum key center server is connected with a user terminal through the center key node and the multi-level key relay nodes in sequence. The quantum key center server is connected with a quantum key relay server of the center key node. The invention also provides a quantum key synchronizing method. Compared with the prior art, the system has the advantages that a purpose of synchronizing and sharing a key by the multilevel relay nodes and the quantum key management center is realized in a mode of encrypting a to-be-synchronized key of the subordinate key relay node through adoption of the key of the superior key relay node, wherein the key of the superior key relay node is already synchronized with the center key node; the quantum key is shared between two non-adjacent nodes; the system can be applied to multiparty communication occasions in large scale; and the cost of a quantum channel is reduced to a certain degree.

Description

technical field [0001] The invention relates to the technical field of secure communication, in particular to a multi-level relay-based quantum key synchronization system and synchronization method. Background technique [0002] With the widespread popularization of the Internet, information transmission among human beings has reached an unprecedented quantity and frequency, and various private information is increasingly exposed on the Internet. Therefore, human beings' demand for confidential communication has also reached an unprecedented height. The current Internet information security encryption method is called "public key" cryptography system. Its principle is to generate a public key that spreads on the network and a private key that stays inside the computer through an encryption algorithm. The two keys must match Use to achieve a complete encryption and decryption process. [0003] The encryption standard used by the modern Internet is the RSA algorithm born in t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-level relay-based quantum key synchronization system and synchronization method to solve the problem that the key obtained from the QKD network in the prior art can only be shared between two adjacent nodes and cannot Large-scale application to multi-party communication occasions has caused great limitations to the development of quantum encryption communication.

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