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CW 430
Liesje Demuynck, and Bart De Decker
Anonymous updating of credentials
Abstract
In this paper, a high-level overview of credential systems is presented. Particular attention is paid to the two most elaborated systems to date: the credential system by Brands on the one hand and the CL system of Camenisch and Lysyanskaya on the other hand. Both systems are described in detail and a comparison is made based on their cryptographic building blocks, linkability properties and performance measures. It is then shown how the protocols in both systems can be extended to enable the anonymous updating of credentials. The resulting systems are evaluated using a case study implementing a privacy- friendly loyalty card.
report.pdf (232K) / mailto: L. Demuynck