Abstract:

A transitory classified keys management based on LKH (logical key hierarchy) was presented for clustered WSN (wireless sensor network). In the method, Diffie-Hullman keys agreement and LKH were used to distribute three types of keys which would be referred in the communications between nodes. The event-trigger based dynamic update strategy was launched to secure keys when network’s topology varies. The experiment shows that the key agreement efficiently reduces the communication and storage with slight calculation overload, and dynamic update strategy accommodates to the network topology changes and improves system’s security.

Key words: Keys Management, Logical Key Hierarchy, Transitory Classified Keys Clustered Sensor Network;