Keyless car sharing system: A security and privacy analysis

This paper proposes a novel physical keyless car sharing system where users can use and share their cars without the need of physical keys. It also provides a comprehensive security and privacy analysis of such a system. It first presents a high-level model for a keyless car sharing system, describing its main entities and specifying the necessary functional requirements to allow users to share their cars (with other users) without exchanging physical keys. Based on this model and functional requirements, the paper presents a comprehensive threat analysis of the system. It focuses on the threats affecting the system's security and the users' privacy. This analysis results in a specification of an extensive set of security and privacy requirements for the system. This work can be used as a guide for a future keyless car sharing system design and as a mean to assess the security and privacy risks imposed on users by such systems.