Key management method and key distribution method for trusted relay node

Abstract

The invention provides an improved trusted relay node key management method and a key distribution method, which do not need to bind a path quantum key with a specific relay path, but can apply a pre-generated relay forwarding key to any required relay path, and have the broadcast capability of a key relay service. Therefore, the pre-stored quantum key resource can be fully utilized, meanwhile, the influence on the relay response time is extremely small, only one time of exclusive or operation needs to be carried out compared with the prior art at most, and the problems of quantum key waste and relay capability limitation existing when the initiation of the key relay service is unpredictable in the existing scheme can be solved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a key management method suitable for a trusted relay node, and a key distribution method using the key management method. Background technique [0002] In the existing quantum key distribution (QKD) network, the trusted relay node needs to share the quantum key with each adjacent trusted relay node (which can be regarded as the shared quantum key with each adjacent trusted relay node) in advance. The path quantum key on the relay path between nodes) is XORed and stored, so that when the key relay request arrives, the key that needs to be shared can be relayed to the corresponding relay path in time. . [0003] For example, in figure 1 In the quantum key distribution network shown, the trusted relay node S stores the shared quantum key K corresponding to the adjacent relay nodes B, C, and D respectively. SB , K SC , K SD (Path quantum key). In order to ensure the ...

AI Technical Summary

Problems solved by technology

[0008] Aiming at this problem, the present invention proposes an improved trusted relay node key management method and key distribution method, wherein, there is no need to combine the path quantum key (or in other words, the path quantum key of different relay paths) The relay forwarding key obtained by two XOR operations) is bound to a specific relay path, but the pre-generated relay forwarding key can be used for any required relay path, and the key relay service Broadcast capability, so it can make full use of the pre-stored quantum key resources, and at the same time, it has little impact on the relay response time. It only needs to perform an XOR operation at most one more time than the existing technology, and it can solve the existing solutions in the key The problem of quantum key waste and relay capacity limitation when the initiation of the relay service is unpredictable

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