A digital master-ticket city-pass scheme based on Chameleon hash

In recent years considerable attention has arisen over the city-pass (or travel-volume) used in self-service trip. For instance, Japan rail-pass is a type of city-pass. A traveler can use Japan rail-pass to access JR transportation services. And, the traveler with Japan rail-pass gets convenient sightseeing in Japan. Although the city-pass has been use by many cities, the scholars have thus far been relatively little research to the city-pass digitalization. The Chameleon hash is a trapdoor one-way hash function. The collision resistance, trapdoor collisions, and uniformity are famous properties of Chameleon hash. Base on these properties, the presented paper proposes a Chameleon-hash-based scheme that can be used in city-pass applications. In such applications, a traveler (or a city visitor) uses a sub-ticket that generated by an authenticated server and the traveler´s master-ticket to access any services provided the server. For these famous properties of Chameleon hash, our scheme can be proved secure in the applications.