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In this paper, the authors discuss an efficient implementation of anonymous credentials on smart cards. In general, privacy-preserving protocols are computationally intensive and require the use of advanced cryptography. Implementing such protocols for smart cards involves a trade-off between the requirements of the protocol and the capabilities of the smart card. In this paper they concentrate on the implementation of Microsoft's U-Prove technology on the MULTOS smart card platform. Their implementation aims at making the smart card independent of any other resources, either computational or storage. In contrast, Microsoft suggests an alternative approach based on device-protected tokens which only uses the smart card as a security add-on.
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