---
title: Multifactor Authentication
icon: material/two-factor-authentication
description: These tools assist you with securing your internet accounts with multifactor authentication without sending your secrets to a third party.
cover: multi-factor-authentication.webp
---

<small>Protects against the following threat(s):</small>

- [:material-target-account: 표적 공격(Targeted Attacks)](basics/common-threats.md#attacks-against-specific-individuals ""){.pg-red}

<div class="admonition note" markdown>
<p class="admonition-title">Hardware Keys</p>

[Hardware security key recommendations](security-keys.md) have been moved to their own category.

</div>

**Multifactor authentication apps** implement a security standard adopted by the Internet Engineering Task Force (IETF) called **Time-based One-time Passwords**, or **TOTP**. This is a method where websites share a secret with you which is used by your authenticator app to generate a six (usually) digit code based on the current time, which you enter while logging in for the website to check. Typically, these codes are regenerated every 30 seconds, and once a new code is generated the old one becomes useless. Even if a hacker gets one six-digit code, there is no way for them to reverse that code to get the original secret or otherwise be able to predict what any future codes might be.

We highly recommend that you use mobile TOTP apps instead of desktop alternatives as Android and iOS have better security and app isolation than most desktop operating systems.

## Ente Auth

<div class="admonition recommendation" markdown>

![Ente Auth logo](assets/img/multi-factor-authentication/ente-auth.svg){ align=right }

**Ente Auth** is a free and open-source app which stores and generates TOTP tokens. It can be used with an online account to back up and sync your tokens across your devices (and access them via a web interface) in a secure, end-to-end encrypted fashion. It can also be used offline on a single device with no account necessary.

[:octicons-home-16: Homepage](https://ente.com/auth){ .md-button .md-button--primary } [:octicons-eye-16:](https://ente.com/privacy){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://ente.com/help/auth){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/ente-io/ente/tree/main/auth#readme){ .card-link title="Source Code" }

<details class="downloads" markdown>
<summary>Downloads</summary>

- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=io.ente.auth)
- [:simple-appstore: App Store](https://apps.apple.com/app/id6444121398)
- [:simple-github: GitHub](https://github.com/ente-io/ente/releases?q=auth)
- [:octicons-browser-16: Web](https://auth.ente.io)

</details>

</div>

The server-side source code and infrastructure which underpins Ente Auth (if used with an online account) underwent an audit by [Cure53](https://ente.com/blog/cern-audit) in October 2025.

## Aegis Authenticator (Android)

<div class="admonition recommendation" markdown>

![Aegis logo](assets/img/multi-factor-authentication/aegis.png){ align=right }

**Aegis Authenticator** is a free and open-source app for Android to manage your 2-step verification tokens for your online services. Aegis Authenticator operates completely offline/locally, but includes the option to export your tokens for backup unlike many alternatives.

[:octicons-home-16: Homepage](https://getaegis.app){ .md-button .md-button--primary }
[:octicons-eye-16:](https://getaegis.app/aegis/privacy.html){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://github.com/beemdevelopment/Aegis/wiki){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/beemdevelopment/Aegis){ .card-link title="Source Code" }
[:octicons-heart-16:](https://buymeacoffee.com/beemdevelopment){ .card-link title="Contribute" }

<details class="downloads" markdown>
<summary>Downloads</summary>

- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=com.beemdevelopment.aegis)
- [:simple-github: GitHub](https://github.com/beemdevelopment/Aegis/releases)

</details>

</div>

## 평가 기준

**Privacy Guides는 권장 목록의 어떠한 프로젝트와도 제휴를 맺지 않았습니다.** 객관적인 권장 목록을 제공하기 위해, [일반적인 평가 기준](about/criteria.md)에 더해 명확한 요구 사항을 정립하였습니다. 어떠한 프로젝트를 선택해 사용하기 전에, 이러한 요구 사항들을 숙지하고 여러분 스스로 조사하는 과정을 거쳐 적절한 선택을 하시기 바랍니다.

- 소스 코드는 공개적으로 이용 가능해야 합니다.
- 인터넷 연결 없이도 작동해야 합니다.
- Cloud syncing must be optional; sync functionality, if available, must be E2EE.
