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Erschienen in:
2015 | OriginalPaper | Buchkapitel
Efficient E-cash with Attributes on MULTOS Smartcards
verfasst von : Gesine Hinterwälder, Felix Riek, Christof Paar
Erschienen in: Radio Frequency Identification
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Ever since its invention in the 1980s, e-cash has been considered a promising solution for privacy-preserving electronic payments. However, the computational capabilities, required for the processing of e-cash protocols, are demanding. Only recent works show the feasibility of implementing e-cash on constrained platforms. A particularly challenging, while at the same time extremely attractive platform, are
smartcards
. Smartcards are, next to magnetic stripe cards, the dominant platform used to execute electronic payments, and they enjoy wide user acceptance. In this paper we present an implementation of two e-cash schemes on MULTOS smartcards. We base the schemes on elliptic curve cryptography, which is supported by the API of the platform of choice. Our results are promising: When relying on a 160-bit elliptic curve, spending a coin, which encodes two attributes that are not revealed, can be executed in less than 800 ms with both considered schemes.