US 12,244,700 B2
Method and apparatus for enhancing security of quantum key distribution network
Xiongfeng Ma, Beijing (CN); and Yizhi Huang, Beijing (CN)
Assigned to TSINGHUA UNIVERSITY, Beijing (CN)
Appl. No. 18/692,524
Filed by TSINGHUA UNIVERSITY, Beijing (CN)
PCT Filed Jul. 5, 2022, PCT No. PCT/CN2022/103966
§ 371(c)(1), (2) Date Mar. 15, 2024,
PCT Pub. No. WO2023/045489, PCT Pub. Date Mar. 30, 2023.
Claims priority of application No. 202111131691.5 (CN), filed on Sep. 26, 2021.
Prior Publication US 2024/0333487 A1, Oct. 3, 2024
Int. Cl. H04L 9/08 (2006.01)
CPC H04L 9/0852 (2013.01) 11 Claims
OG exemplary drawing
 
1. A method for enhancing security of a quantum key distribution network, wherein the quantum key distribution network comprises a first node, a second node, and at least one relay node, by means of which the first node and the second node implement a first stage of quantum key distribution, the first node and the second node share a first key pool, which comprises at least one key, and the method is executed on the first node and comprises:
acquiring a first key obtained after the first stage of quantum key distribution;
determining a seed key from the first key pool according to information that is released by the second node and corresponds to the seed key; or determining a seed key from the first key pool and then releasing information corresponding to the seed key to the second node;
generating a first random string by applying, based on the seed key, a first algorithm predetermined with the second node, the first random string having a length equal to that of the first key; and
acquiring a second key by performing a preset first bit operation on the first key and the first random string.