Abstract

Modern digital identity systems such as Apple Wallet and mdoc defined in ISO 18013-5/7, 23220 series use a powerful but approachable pattern: a verifier requests specific attributes, the holder responds with a signed document, and only the necessary information is revealed (for example, “21+ OK” instead of a full birth date).

In this hands-on workshop, we’ll recreate a simplified version of that flow on iOS. Participants will build an app that can act as both a Holder and a Verifier. The Verifier initiates a session using a QR-based handshake, establishes a local connection over BLE / MultipeerConnectivity, sends a challenge and a list of requested attributes, and receives a signed “pseudo document” from the Holder. Using CryptoKit, we’ll sign and verify the payload on-device and display only the approved attributes in the UI.

Daiki Matsudate, Software Engineer @ Japan

Daiki Matsudate is an iOS engineer and conference organizer based in Tokyo. He works across public digital services and autonomous driving R&D, focusing on bringing cutting-edge technology into everyday life. As main organizer of try! Swift Tokyo, one of the largest Swift conferences in Asia, he is active in the global iOS community. He loves snowboarding.