Encryption and decryption method and system for quantum secret communication

Abstract

The invention provides an encryption and decryption method and system for quantum secret communication, and the method comprises the steps: enabling a relay node directly connected with a target nodeto serve as an odd node, enabling an adjacent relay node of the relay node to serve as an even node, and carrying out the analogy; when the starting node and the target node carry out data transmission, each odd node transmitting the quantum key between the odd node and the two adjacent nodes to the starting node after exclusive OR, and each even node transmitting the quantum key between the evennode and the two adjacent nodes to the target node after exclusive OR; and the starting node performing exclusive OR on the own key and the received key to obtain an encryption key, and the target node performing exclusive OR on the own key and the received key data to obtain a decryption key. According to the method, a specific relay key is not transmitted in the relay node, so that the requirement that the relay key needs to pass through all the relay nodes hop by hop is avoided, the credible requirement degree on the relay node is reduced, and the security of confidential information transmission can be fully guaranteed.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to an encryption and decryption method and system for quantum secure communication. Background technique [0002] The encryption and decryption of the existing quantum secure communication is mainly based on the hop-by-hop transfer of the key based on the trusted relay. The process is as follows: figure 1 As shown, for example, the starting node needs to send data to the target node, the starting node first conducts quantum secret communication with the adjacent node (set as the first hop node) to negotiate the quantum key K, and the starting node uses the quantum key K performs an encryption operation on the data (generally an XOR operation) and then sends the encrypted information to the target node through classical communication; Node, the fourth hop node..., the Nth hop node, the target node) conduct quantum secret communication to negotiate the quantum key K1, so t...

AI Technical Summary

Problems solved by technology

[0004] The above technical solution is equivalent to using K1 as the relay key, and then the subsequent relay node XORs it with the negotiated key of the adjacent node and sends it directly to the target node, and the target node solves the key of each relay node in the reverse direction. Negotiate the key, and finally deduce the relay key K1. In this scheme, the relay key K1 used for encryption will appear not only at the starting node A, but also at the first relay node C1, and still exists certain leakage risk

In addition, in this scheme, the communication pressure at the target node B is relatively high, and the target node needs to calculate the relay key K1 according to the received adjacent XOR values ​​of all nodes, and the calculation pressure is also high

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