Parking Tickets for Privacy-Preserving Pay-by-Phone Parking

Traditionally, the payment required for parking in regulated areas has been made through parking meters. In the last years, several applications which allow to perform these payments using a mobile device have appeared. In this paper we propose a privacy-preserving pay-by-phone parking system offering the same privacy as the traditional paper-based method even assuming an internal attacker with full access to all the information managed by the system servers. Drivers'privacy is preserved without requiring them to trust any party. Furthermore, the system can tolerate that the mobile devices of drivers fall out of coverage while their cars are parked.