authelia/docs/features/2fa/index.md

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---
layout: default
title: Second Factor
parent: Features
nav_order: 1
has_children: true
---
# Second Factor
There are multiple supported options for the second factor.
* Time-based One-Time passwords with [Google Authenticator]
* Security Keys with tokens like [Yubikey].
* Push notifications on your mobile using [Duo].
<p align="center">
<img src="../../images/2FA-METHODS.png" width="400">
</p>
[Duo]: https://duo.com/
[Yubikey]: https://www.yubico.com/products/yubikey-hardware/yubikey4/
[Google Authenticator]: https://google-authenticator.com/