We are pleased to release a first version of our taxonomy for digital identity systems.

In it, we map out actors, the roles they can assume, their various objectives, the threats to digital identity systems as well a the cohort of techniques and technologies that can be used to build such systems. One of the takeaways to get from this taxonomy is that while credential format and presentation are key to privacy in a digital identity system, there are lots of adjacent problems that must be solved for the complete proposition to be sound. An example would be: querying trust registries and revocation lists without leaking information about transaction actors.

This is a first step towards a systematic approach to comparing digital identity systems.

You can download it here: taxonomy-eid-paper.pdf.

If you prefer to build it yourself, use the github repository github.com/eid-privacy/sok-eid