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Intelligent transportation systems (ITS) are expected to effectively create astand-alone network for secure communication among autonomous agents. In such adynamic and fast-changing network with high-speed agents, verifying theauthenticity and integrity of messages while taking preventive action (e.g.,applying brakes) within tens of milliseconds is one of the main challenges. Insuch a brief moment after receiving a message, the agent not only must verifythe integrity and authenticity of the received message but also needs toperform extra computations to localize the sender of the message for takingappropriate action (e.g., an immediate stop warning from a vehicle in front vs.rear). In this paper, we present an inherently location-aware and lightweightauthentication protocol by exploiting in situ visual localization (i.e., SLAM).In this protocol, each agent displays its public key using visualauthentication beacons (e.g., QR codes). Thus, receiving agents not only canverify and authenticate the messages but also can easily localize the sender bykeeping a shortlist of observed visual beacons within their visual localizationsystem with no additional computation cost. Compared to prior work, ourlocation-aware protocol is scalable, does not depend on any infrastructure,removes the high cost of post-message-delivery localization, and providestrustworthiness guarantees for information that are beyond the reach of eachagent sensors.

Secure Location-Aware Authentication and Communication for Intelligent Transportation Systems