Towards the Design of a Privacy-preserving Attribute Based Credentials-based Digital ID in Denmark – Usefulness, Barriers, and Recommendations

In this paper, we explore why partial identity technologies such as privacy-preserving attribute based credentials (pABCs) have been around for a while without getting adopted in real life identity solutions and how we might design for such technologies. This is done by exploring whether this is perceived useful from the user as well as the service provider side through the design of a digital identity solution in Denmark. Two interview studies with three and 11 participants representing service providers and users, respectively, were carried out and a design for a digital identity solution was created. The results show that while there is a use for such technologies, there are certain issues that need to be considered. Based on the results, we present 8 design recommendations on implementing a digital identity solution based on pABCs. For future work, we suggest that these studies should be repeated in other national contexts to explore how general the results are.