Mass transport ticketing with mobile phones is already deployed in many metropolitan areas, but current solutions and protocols are not secure, and they are limited to one-time or fixed-time ticketing in non-gated transport systems. The emergence of NFC-enabled phones with trusted execution environments makes it possible to not only integrate mobile phone ticketing with existing and future transport authority ticket readers, but also to construct secure protocols for non-gated travel eliminating many associated possibilities for ticketing fraud. This paper presents an architecture and implementation for such a system.
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