Security Credential Management System (SCMS)
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Filetype[PDF-1.40 MB]

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      The U.S. Department of Transportation (U.S. DOT) is committed to ensuring that connected vehicle technologies operate in a safe, secure, and privacy-protective manner. As connected vehicle applications exchange information among vehicles, roadway infrastructure, traffic management centers, and wireless mobile devices, a security system is needed to ensure that users can trust in the validity of information received from other system users—indistinct users whom they have never met and do not know personally. For this reason, the Department partnered with the automotive industry and industry security experts through the Crash Avoidance Metrics Partnership (CAMP) to design and develop a proof-of-concept (POC) security system that enables users to have confidence in one another and the system as a whole. Subsequently, the POC SCMS has been retired and multiple commercial SCMS vendors are operating and providing certificates for real-world connected vehicle deployments. The SCMS is a message security solution for vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication. It uses a Public Key Infrastructure (PKI)-based approach that employs highly innovative methods of encryption and certificate management to facilitate trusted communication. Authorized system participants use digital certificates issued by an SCMS to authenticate and validate the safety and mobility messages that form the foundation for connected vehicle technologies. To protect the privacy of vehicle owners and operators, these certificates contain no personal or equipment-identifying information but serve as system credentials so that other users in the system can trust the source of each message. The SCMS also plays a key function in protecting the content of each message by identifying and removing misbehaving devices, while still maintaining privacy.
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