Abstract: IEEE802.15.4e is the latest MAC layer standards for the industrial Internet of things,which enables highly reliable and ultra-low power wireless networking through time synchronization technique.Because time synchronization is a core fundamental technology for industrial wireless network,it often becomes an attractive target for attac-kers.This paper proposed a secure multi-hop time synchronization mechanism called SMTSF for IEEE802.15.4e.SMTSF mainly adopt anomaly-based intrusion detection algorithm,multi-path approach based on trust modeling,encryption and authentication technologies to secure multi-hop time synchronization.In the process of anomaly-based intrusion detection algorithm,the border router nodes verify the rank value of other nodes in the network which can effectively detect time synchronization tree attack.A mini-firewall based on packet filtering can stop intrusion attempts from the Internet.The multi-path approach based on trust modeling can find a secure path to the root node by establishing trust model between nodes.Simulation experiments show that SMTSF can detect time synchronization tree attack and defend against compromise attack.

Key words: IEEE802.15.4e,Secure,Time synchronization,Industrial Internet of things