NFC
technicalFull Name: Near Field Communication
Definition
Near Field Communication (NFC) is a short-range wireless communication technology operating at 13.56 MHz with a typical range of 1-4 centimeters. Originally developed for contactless payment systems, NFC has become a critical technology for the EUDI Wallet ecosystem, serving two primary functions: reading the embedded chips in physical eID cards during wallet activation (identity proofing), and enabling proximity (face-to-face) credential presentation between a wallet device and a verifier's reader. NFC's inherent short range provides a natural security boundary, as communication can only occur when devices are in close physical proximity.
NFC for eID Card Reading and Identity Proofing
The most critical use of NFC in the EUDI Wallet lifecycle is during wallet activation and identity proofing. EU national eID cards (the physical identity documents issued by Member States) contain RFID/NFC chips storing the citizen's identity data, biometric information, and cryptographic certificates. To achieve LoA High identity proofing, the EUDI Wallet reads this chip using the smartphone's NFC interface.
The card reading process uses the ICAO 9303 protocol (also used for electronic passports) with Passive Authentication (verifying the card data's digital signature), Active Authentication or Chip Authentication (proving the card is genuine and not cloned), and optionally Terminal Authentication (proving to the card that the reading device is authorized). These protocols ensure that the identity data read from the card is authentic and has not been tampered with.
During activation, the user enters a CAN (Card Access Number) or places the card, the phone reads the chip data via NFC, and the wallet app compares a live photo or fingerprint of the user against the biometric data stored on the card chip. This process creates a verified link between the physical person and their digital wallet, achieving the strong identity proofing required for LoA High credentials.
Germany's Online-Ausweis system pioneered this approach, using the Personalausweis (national ID card) chip for online authentication since 2010. The EUDI Wallet extends this concept across all EU Member States, with each country's eID card chip serving as the trust anchor for wallet activation.
NFC for Proximity Credential Presentation
The ISO 18013-5 standard defines NFC as the primary mechanism for initiating proximity credential presentations. When a user needs to present their mDoc credential to a verifier (such as a police officer checking a driving license), the process begins with an NFC tap between the user's smartphone and the verifier's reader device.
The NFC tap serves as the "device engagement" phase, where both devices exchange the parameters needed to establish a secure communication session. This includes exchanging ephemeral public keys for ECDH key agreement, negotiating the data transfer protocol (NFC, BLE, or Wi-Fi Aware), and establishing the session encryption key. Because NFC range is limited to a few centimeters, this initial exchange has inherent physical proximity verification -- both devices must be held close together.
After session establishment via NFC, larger data transfers typically switch to Bluetooth Low Energy (BLE) for better throughput and range flexibility. The user can move their phone away from the reader while the credential data transfers over the encrypted BLE session. This hybrid approach combines NFC's security benefits (physical proximity verification) with BLE's practical benefits (higher throughput, greater comfort for the user).
The entire proximity presentation flow works completely offline -- neither the user's phone nor the verifier's reader needs internet connectivity. This is essential for scenarios like roadside traffic stops in rural areas, border control points with limited connectivity, or emergency identity verification situations.
Platform Support and Apple NFC Access
NFC hardware is present in virtually all smartphones sold in the EU since 2018. Android has provided full NFC access (including Host Card Emulation for card emulation mode) since Android 4.4 (2013), making Android devices fully capable of both reading eID cards and presenting credentials via NFC.
Apple's iOS historically restricted NFC functionality, limiting third-party access to reader mode only and reserving card emulation for Apple Pay. This posed a significant challenge for EUDI Wallet development, as iPhone users could read eID cards for wallet activation but could not present credentials via NFC tap. Apple progressively opened NFC capabilities starting with iOS 13 (background tag reading) and iOS 17 (expanded NFC access).
The EU's Digital Markets Act (DMA) and direct negotiations with Apple regarding EUDI Wallet access have influenced Apple's NFC policy. Ensuring equal NFC functionality on both iOS and Android is considered critical for the success of the EUDI Wallet, as any platform limitation would exclude a significant portion of EU citizens from full wallet functionality.
For older devices without NFC, alternative presentation methods (QR code scanning, Bluetooth-only) are available but provide a degraded user experience and weaker physical proximity guarantees. The EUDI Wallet Architecture Reference Framework considers NFC the primary proximity communication channel while supporting fallback mechanisms for compatibility.