Yubico Authenticator is a highly secure two-factor authentication application that stores your unique credentials on a hardware-backed security key. This allows you to take your credentials wherever you go, from mobile to desktop, without leaving sensitive information on your mobile device and making your account vulnerable to takeovers.

The app generates a code that verifies your identity as you log into various services, all without the need for connectivity. The Yubico Authenticator is compatible with any USB or NFC-enabled YubiKeys, making it a versatile security solution.

Its features include time-based and counter-based code generation, user presence requirements, and the ability to configure what happens when you tap a YubiKey against the NFC reader of your phone when the app isn't running. The app securely stores secrets on the YubiKey, not on the mobile device, ensuring maximum security.