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Recently, operators of public transportation in many countries started to roll out electronic tickets (e-tickets). E-tickets offer several advantages to transit enterprises as well as to their customers, e.g., they aggravate forgeries by cryptographic means whereas customers benefit from fast and convenient verification of tickets or replacement of lost ones. Existing (proprietary) e-ticket systems deployed in practice are mainly based on RFID technologies where RFID tags prove authorization by releasing spatio-temporal data that discloses customer-related data, in particular their location.
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