---
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: Ataques direcionados](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**. Este é um método através do qual os sites partilham um segredo, que é utilizado pela sua aplicação de autenticação para gerar um código de seis dígitos (normalmente) com base na hora atual, que deverá introduzir ao iniciar sessão, para que o site o possa verificar. Typically, these codes are regenerated every 30 seconds, and once a new code is generated the old one becomes useless. Mesmo que um pirata informático obtenha o código de seis dígitos, não há forma de reverter esse código para obter o segredo original ou de prever quais serão os códigos futuros.

Recomendamos vivamente que utilize aplicações TOTP para dispositivos móveis, em vez de alternativas para computador, uma vez que o Android e o iOS têm melhor segurança e isolamento de aplicações do que a maioria dos sistemas operativos para PC.

## 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>

## Critérios

**Note que não estamos associados a nenhum dos projetos que recomendamos.** Para além dos [nossos critérios padrão](about/criteria.md), temos um conjunto claro de requisitos que nos permitem fornecer recomendações objetivas. Sugerimos que se familiarize com esta lista antes de optar por um projeto e que desenvolva a sua própria investigação para garantir que se trata da escolha certa para si.

- O código-fonte deve estar disponível ao público.
- Não devem exigir ligação à Internet.
- Cloud syncing must be optional; sync functionality, if available, must be E2EE.
