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<p><strong>Rat Two-Factor Authentication</strong> is a lightweight yet powerful security plugin that adds an extra layer of protection to your WordPress site through email-based One-Time Password (OTP) verification.</p>
<h4>Key Features</h4>
<ul>
<li><strong>Email-based OTP verification</strong> – Secure 6-digit codes sent to user’s email</li>
<li><strong>Lightweight and fast</strong> – Minimal impact on site performance</li>
<li><strong>User-friendly interface</strong> – Clean, responsive design that works on all devices</li>
<li><strong>Flexible settings</strong> – Enable 2FA globally or per user</li>
<li><strong>Role-based requirements</strong> – Require 2FA for specific user roles</li>
<li><strong>Session management</strong> – Secure session handling with timeout protection</li>
<li><strong>AJAX-powered</strong> – Smooth user experience without page reloads</li>
<li><strong>Auto-submit functionality</strong> – Automatically submits form when 6 digits are entered</li>
<li><strong>Resend functionality</strong> – Users can request new codes with cooldown protection</li>
<li><strong>Mobile-friendly</strong> – Optimized for mobile login experiences</li>
<li><strong>Security-first</strong> – Nonce protection, input sanitization, and secure coding practices</li>
</ul>
<h4>How It Works</h4>
<ol>
<li>User enters their username and password normally</li>
<li>If 2FA is enabled, they’re redirected to an OTP verification screen</li>
<li>A 6-digit code is sent to their registered email address</li>
<li>User enters the code to complete login</li>
<li>Code expires after 10 minutes for security</li>
</ol>
<h4>Perfect For</h4>
<ul>
<li><strong>Business websites</strong> requiring enhanced security</li>
<li><strong>E-commerce stores</strong> protecting customer accounts</li>
<li><strong>Membership sites</strong> with sensitive user data</li>
<li><strong>Multi-author blogs</strong> securing contributor access</li>
<li><strong>Any WordPress site</strong> wanting better login security</li>
</ul>
<h4>Admin Features</h4>
<ul>
<li><strong>Global 2FA setting</strong> – Enable for all users</li>
<li><strong>Force 2FA option</strong> – Make it mandatory for selected roles</li>
<li><strong>Role-based configuration</strong> – Choose which roles require 2FA</li>
<li><strong>User profile integration</strong> – Users can enable/disable 2FA individually</li>
<li><strong>Clean admin interface</strong> – Easy to configure and manage</li>
</ul>
<h4>Developer Friendly</h4>
<ul>
<li><strong>Well-documented code</strong> with inline comments</li>
<li><strong>WordPress coding standards</strong> compliant</li>
<li><strong>Hook system</strong> for customization</li>
<li><strong>Lightweight codebase</strong> for easy modification</li>
<li><strong>No external dependencies</strong> – Pure WordPress integration</li>
</ul>
<h4>Security Features</h4>
<ul>
<li><strong>Nonce verification</strong> for all AJAX requests</li>
<li><strong>Input sanitization</strong> and validation</li>
<li><strong>Secure OTP generation</strong> using WordPress built-in functions</li>
<li><strong>Session timeout</strong> protection (10 minutes)</li>
<li><strong>Rate limiting</strong> on resend requests</li>
<li><strong>No plain text storage</strong> of OTP codes</li>
</ul>
<h3>Configuration</h3>
<h4>Global Settings</h4>
<p>Navigate to <strong>Settings > Two-Factor Auth</strong> to configure:</p>
<ul>
<li><strong>Enable 2FA Globally</strong>: Turn on 2FA for all users</li>
<li><strong>Force 2FA for All Users</strong>: Make 2FA mandatory regardless of user preference</li>
<li><strong>Required User Roles</strong>: Select specific roles that must use 2FA</li>
</ul>
<h4>User Settings</h4>
<p>Each user can enable/disable 2FA in their profile:</p>
<ol>
<li>Go to <strong>Users > Profile</strong> (or <strong>Users > Your Profile</strong>)</li>
<li>Find the “Two-Factor Authentication” section</li>
<li>Check “Enable 2FA” to activate for that user</li>
<li>Save the profile</li>
</ol>
<h4>Email Configuration</h4>
<p>The plugin uses WordPress’s built-in <code>wp_mail()</code> function. Ensure your site can send emails properly. Consider using:</p>
<ul>
<li>SMTP plugins for reliable email delivery</li>
<li>Email services like SendGrid, Mailgun, or Amazon SES</li>
<li>Proper SPF/DKIM records for your domain</li>
</ul>
<h3>Support</h3>
<p>For support, feature requests, or bug reports:</p>
<ul>
<li><strong>Plugin Support</strong>: <a href="https://wordpress.org/support/plugin/rat-two-factor-authentication" rel="ugc">WordPress.org Support Forum</a></li>
<li><strong>Documentation</strong>: Available in the plugin’s admin area</li>
<li><strong>Bug Reports</strong>: Please provide detailed information about your setup</li>
</ul>
<h3>Contributing</h3>
<p>We welcome contributions! The plugin follows WordPress coding standards and best practices.</p>
<h3>Privacy Policy</h3>
<p>This plugin:<br />
* Stores minimal user data (2FA preference and temporary OTP hashes)<br />
* Does not send data to external services<br />
* Uses WordPress’s built-in email system<br />
* Follows WordPress privacy guidelines<br />
* Allows data export/erasure as per GDPR requirements</p>
<h3>Technical Requirements</h3>
<ul>
<li>WordPress 5.0 or higher</li>
<li>PHP 7.4 or higher</li>
<li>MySQL 5.6 or higher (or equivalent MariaDB)</li>
<li>Ability to send emails from WordPress</li>
<li>Modern web browser with JavaScript enabled</li>
</ul>
<h3>Credits</h3>
<p>Developed with ❤️ by the Rat Plugins team, focused on creating lightweight, powerful, and user-friendly WordPress plugins.</p>
<h3>License</h3>
<p>This plugin is licensed under the GPL v2 or later.</p>
<blockquote>
<p>This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.</p>
<p>This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.</p>
</blockquote>


Rat Two-Factor Authentication

Lightweight and powerful Two-Factor Authentication plugin for WordPress with email-based OTP verification.

Duo Security

<p>Duo Security provides two-factor authentication as a service to protect against account takeover and data theft. Using the Duo plugin you can easily add Duo two-factor authentication to your WordPress website in just a few minutes!</p>
<p>Rather than relying on a password alone, which can be phished or guessed, Duo’s authentication service adds a second layer of security to your WordPress accounts. Duo enables your admins or users to verify their identities using something they have—like their mobile phone or a hardware token—which provides strong authentication and dramatically enhances account security.</p>
<p>Duo is easy to setup and use. With Duo there’s no extra hardware or complicated software to install, just sign up for Duo’s service and install the plugin. Then you can set which user roles you want to enable two-factor authentication for—admins, editors, authors, contributors, and/or subscribers—without setting up user accounts, directory synchronization, servers, or hardware.</p>
<p>When they log in, your users have multiple ways they can authenticate, including:</p>
<ul>
<li>One-tap authentication using Duo’s mobile app (our fastest, easiest way to authenticate)</li>
<li>One-time passcodes generated by Duo’s mobile app (works even with no cell coverage)</li>
<li>One-time passcodes delivered to any SMS-enabled phone (works even with no cell coverage)</li>
<li>Phone callback to any phone (mobile or landline!)</li>
<li>One-time passcodes generated by an OATH-compliant hardware token (if you’re feeling all old school)</li>
</ul>
<p>Protect your WordPress website in minutes with Duo.</p>
<h3>End of Support Notice</h3>
<p>Support for the traditional Duo Prompt experience using the Duo WordPress plugin ended on September 30, 2024. Please use the new <a href="https://wordpress.org/plugins/duo-universal/" rel="ugc">Duo Universal plugin for WordPress</a>. Read more about the End of Suppport and migration to the new plugin on our <a href="https://duo.com/docs/wordpress" rel="nofollow ugc">Duo for WordPress – Duo Universal Prompt</a> documentation page</p>


Duo Two-Factor Authentication

Easily add Duo Security two-factor authentication to your WordPress website. Enable two-factor authentication for your admins and/or users.

Rat Two-Factor Authentication vs Duo Two-Factor Authentication