alt Hacker NewsI’m not sure what you are saying I am mixing up.
The article links to the source code repository here:
https://github.com/eu-digital-identity-wallet/av-app-android...
That links to the tech spec:
> The solution leverages the existing eIDAS infrastructure, including eIDAS nodes and the trust framework for trusted services, to ensure a high level of security and reliability. By aligning with the technical architecture of the EU Digital Identity Wallet ARF, the solution delivers secure, reusable, and interoperable proofs of age.
> The solution enables users to present their Proof of Age attestation to Relying Parties, primarily for online use cases. The system is optimised for secure and privacy-preserving online presentation, allowing users to prove their eligibility without disclosing unnecessary personal information.
— https://github.com/eu-digital-identity-wallet/av-doc-technic...
Annex A includes details on the ZKP:
> AVI SHOULD support the generation of Zero-Knowledge Proofs using the solution detailed in: "Matteo Frigo and abhi shelat, Anonymous credentials from ECDSA, Cryptology ePrint Archive, Paper 2024/2010, 2024, available at https://eprint.iacr.org/2024/2010".
— https://github.com/eu-digital-identity-wallet/av-doc-technic...
And the linked paper:
> Anonymous digital credentials allow a user to prove possession of an attribute that has been asserted by an identity issuer without revealing any extra information about themselves. For example, a user who has received a digital passport credential can prove their “age is ” without revealing any other attributes such as their name or date of birth.
You're both right.
Without exposing my citizenship, I was able to use by EU-nation issued ID to confirm only my year of birth.
The website supported this country's national ID login method, in the login challenge asked the server to provide my age, before I signed in to confirm (scanning qr code with my mobile app) I was informed what data was requested, then I consented to them confirming my data.
Not very sensitive things work without my physical ID present, sensitive have additional step with me providing my physical ID (to the NFC reader) and unlocking my key (stored on the ID) with a pin.
All in all it's really very sensible and fast.
Not necessarily the EU ID apps we're talking about but some of the existing implementations.