An Anonymous Credential System and a Privacy-Aware PKI

摘要

In this paper we present a non-transferable anonymous credential system that is based on the concept of a chameleon certificate. A chameleon certificate is a special certificate that enjoys two interesting properties. Firstly, the owner can choose which attributes of the certificate to disclose. Moreover, a chameleon certificate is multi-show in the sense that several uses of the same chameleon certificate by the same user cannot be linked together. We adopt the framework of Brands and our construction improves the results of Camenisch et al. and Verheul since it allows the owner of a certificate to prove general statements on the attributes encoded in the certificate and our certificates enjoy the multi-show property.