The description of this card's features are a little too basic to my taste. Based on the "anonymous credentials" they mention it seems to imply that they're us

The description of this card's features are a little too basic to my taste. Based on the "anonymous credentials" they mention it seems to imply that they're using attribute-based cryptography* to preserve privacy, which would be awesome. Can anybody shed some extra light on this? * = See https://www.irmacard.org/ https://www.irmacard.org/. It allows your card to reliably answer questions like "Am I allowed to enter this country?" and "Am I old enough to buy liquor?" without you having to communicate all your personal data (like full name, exact age, exact country of origin) to the party who needs to check it. In fact, that party would not even be able to gain more information. It just communicates parts of your identity on a need-to-know basis.