Key management system for private car-sharing scenarios

Car Sharing is an innovative transport concept that has emerged to contribute to efficient use of vehicles in urban areas that nowadays suffer from traffic congestion or parking unavailability. Several companies such as vehicle manufacturers have identified the business opportunities related with the car sharing market and realized the potential of providing this service to end-users under a private sharing scenario. However, remaining technical challenges related with the secure management of digital permissions that grant access to vehicles must be addressed. In this paper, we propose a key management system that enables car-sharing use cases, based on a central key management server and a distributed management of the PKI infrastructure. Our system out-stands by providing accountability on the actors and being resilient to internal attackers that attempt to impersonate system entities, provide false credentials to honest users or illegally take over a vehicle.