*2.9.9. TRANS - Trust routing for location aware sensor networks*

TRANS (trust routing for location aware sensor networks) [72] is a geographic routing protocol (GPSR-based [8]) that provides security services using trust metric. It can be considered as a tight trust-based routing due to its specific targets and assumptions. It basically targets a misbehavior model in which an attacker selectively participates in routing signaling and control packets but drops consistently queries and data packets. The protocol also assumes static sensor networks in which a tight mapping can be done between the nodes' identities and their locations. TRANS assumes a location-centric architecture that helps it in isolating misbehavior and establishing trust routing in sensor networks. As a result of that, the protocol assumes a certain communication model in which a single or multiple sinks initiate communication requests with various locations. During that phase, insecure locations are identified and blacklisted. The trust metric used to judge on location security is calculated based on nodes' experience among each other regarding their identities, link availability and packet forwarding.
