Related papers: Secure two-way fiber-optic time transfer against sub-ns asymmetric delay attack

Secure two-way fiber-optic time transfer against sub-ns asymmetric delay attack

URL: http://arxiv.org/abs/2203.03803v1
Date: Tue, 8 Mar 2022 01:55:59 GMT
Title: Secure two-way fiber-optic time transfer against sub-ns asymmetric delay attack
Authors: Yang Li, Jinlong Hu, Li Ma, Wei Huang, Shuai Zhang, Yujie Luo, Chuang Zhou, Chenlin Zhang, Heng Wang, Yan Pan, Yun Shao, Yichen Zhang, Xing Chen, Ziyang Chen, Song Yu, Hong Guo, and Bingjie Xu
Abstract summary: asymmetric delay attack is a serious threat which cannot be prevent by any encryption method. Two-way fiber-optic time transfer system with time stability with 24.5ps, 3.98ps, and 2.95ps at 1s, 10s, and 100s averaging time is shown experimentally.
Score: 20.00845773010957
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Two-way fiber-optic time transfer is a promising precise time synchronization technique with sub-nanosecond accuracy. However, asymmetric delay attack is a serious threat which cannot be prevent by any encryption method. In this paper, a dynamic model based scheme is proposed to defense the sub-nanosecond asymmetric delay attack. A threshold is set according to the estimated time difference by a two-state clock model where the fixed frequency difference is excluded from the time difference to detect the asymmetric delay attack which is smaller than the time difference induced by the fixed frequency difference. Theoretical simulation and experimental demonstration are implemented to prove the feasibility of the scheme. A two-way fiber-optic time transfer system with time stability with 24.5ps, 3.98ps, and 2.95ps at 1s, 10s, and 100s averaging time is shown under sub-ns asymmetric time delay attack experimentally. The proposed method provides a promising secure sub-ns precise time synchronization technique against asymmetric delay attack.

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