Ubiquitous privacy-preserving identity management

The increasing use of digital credentials undermines the owner's privacy. Anonymous credentials offer a powerful means to improve this. However, more is needed w.r.t. usability. A user will indeed have to manage dozens of credentials in the future: sporting club credentials, a driver license, e-tickets, etc. The owner will want to use these anytime at any place. The credentials must remain manageable as well and, in case of theft or loss, they must become unusable by others and recoverable by the legitimate owner. A possible solution based on smart card or SIM tokens is presented, in which user privacy is maximized. An evaluation reveals both strengths and future challenges.status: publishe