Secure Key Renewal in WirelessHART
Shahid Raza, Gianluca Dini, Thiemo Voigt, Mikael Gidlund · 2011
Abstract—WirelessHART is a wireless extension to the HART protocol. Even though WirelessHART is designed to be a secure protocol, the loopholes in the key management system makes it vulnerable to security threats. The broadcast approach for key renewal mechanisms in WirelessHART is not secure enough to be used in sensitive industrial automation environments where breach of security may result in catastrophic results. Also, key distribution with unicast communication with each device re-quiresO(n) rekeying messages, where n is the size of the network. In this paper we provide a secure and scalable key renewal protocol for WirelessHART that reduces the communication overhead to O(logn). Our protocol requires far less messages than the conventional unicast approach. I.