The NDEF (NFC (near-field communication) data exchange format)) data is what is sent over NFC from an NFC enabled YubiKey. As the YubiKey has two programmable slots, you must choose which slot is used for NDEF; to set which slot is used, see Setting the NDEF Slot for NFC Usage. The following features are available over the NDEF interface of NFC enabled YubiKeys:
- Yubico OTP
- OATH-HOTP
- Static Password (Advanced Mode)
Yubico Authenticator for Android can capture the OTP output from a YubiKey over NFC, allowing it to be copy/pasted into any field on an Android device. To do this, enable Read NFC NDEF payload in the app's settings.