Ivan

The Google Authenticator plugin for WordPress gives you two-factor authentication using the Google Authenticator app for Android/iPhone/Blackberry.
If you are security aware, you may already have the Google Authenticator app installed on your smartphone, using it for two-factor authentication on Gmail/Dropbox/Lastpass/Amazon etc.
The two-factor authentication requirement can be enabled on a per-user basis. You could enable it for your administrator account, but log in as usual with less privileged accounts.
If You need to maintain your blog using an Android/iPhone app, or any other software using the XMLRPC interface, you can enable the App password feature in this plugin, 
but please note that enabling the App password feature will make your blog less secure.
<h3>Credits</h3>
Thanks to:
<a href="https://profiles.wordpress.org/evinak/" rel="nofollow ugc">Oleksiy</a> for a bugfix in multisite.
<a href="https://github.com/pancek" rel="nofollow ugc">Paweł Nowacki</a> for the Polish translation
<a href="https://github.com/FabioZumbi12" rel="nofollow ugc">Fabio Zumbi</a> for the Portuguese translation
<a href="https://www.guidoschalkx.com/" rel="nofollow ugc">Guido Schalkx</a> for the Dutch translation.
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=henrik%40schack%2edk&lc=US&item_name=Google%20Authenticator&item_number=Google%20Authenticator&no_shipping=0&no_note=1&tax=0&bn=PP%2dDonationsBF&charset=UTF%2d8" rel="nofollow ugc">Henrik.Schack</a> for writing/maintaining versions 0.20 through 0.48
<a href="http://tobias.baethge.com/" rel="nofollow ugc">Tobias Bäthge</a> for his code rewrite and German translation.
<a href="http://blog.pcode.nl/" rel="nofollow ugc">Pascal de Bruijn</a> for his “relaxed mode” idea.
<a href="http://technobabbl.es/" rel="nofollow ugc">Daniel Werl</a> for his usability tips.
<a href="http://dd32.id.au/" rel="nofollow ugc">Dion Hulse</a> for his bugfixes.
<a href="https://profiles.wordpress.org/users/aldolat/" rel="nofollow ugc">Aldo Latino</a> for his Italian translation.
<a href="http://www.kaijia.me/" rel="nofollow ugc">Kaijia Feng</a> for his Simplified Chinese translation.
<a href="http://www.buayacorp.com/" rel="nofollow ugc">Alex Concha</a> for his security tips.
<a href="http://jetienne.com/" rel="nofollow ugc">Jerome Etienne</a> for his jquery-qrcode plugin.
<a href="http://orizhial.com/" rel="nofollow ugc">Sébastien Prunier</a> for his Spanish and French translation.

Google Authenticator

Personally I feel 2FA should be a part of WordPress core. But since it isn't, plugins like this one are a must-have to secure your sites.

The configuration interface is clearly layed out and the login page fits in perfectly with the default WP login page styling.

This plugin is light-weight, unobtrusive, free and adds that extra layer of security. Should your admin credentials ever be compromised, 2FA will keep your site secure.

Must-have security plugin

Awesome plugin, which is almost always in first group of plugin I've install on new website. Thank you for create and maintain it.

One on few my first-to-install plugin

Google Authenticator for your WordPress blog.

WP-EXPERTS.IN

“Login with OTP” is a simple and secure solution for adding One Time Password (OTP) login functionality to your WordPress site. It enables users, including WooCommerce customers, to log in securely via OTP instead of using traditional passwords.
OTP-based login enhances security by reducing the risks associated with weak or reused passwords. This plugin supports both admin and frontend login with OTP and allows customization such as popup login, redirect URLs, and more.
Watch a demo: https://youtu.be/0E4ZHqRoerc
<h3>Features</h3>
<ul>
<li>Secure login via OTP (One Time Password) for WordPress users and WooCommerce customers.</li>
<li>Login without needing a static password, reducing security risks.</li>
<li>Option to add OTP login for other plugins.</li>
<li>Lightbox login popup for improved user experience.</li>
<li>Customizable redirect URL after successful login.</li>
<li>Ability to place the login popup anywhere on your website.</li>
<li>Shortcode support: <code>[otp_login title="Login with OTP"]</code> for easy integration.</li>
</ul>
<h3>Support</h3>
For support, bug reports, or feature requests, please contact the plugin author at: <a href="mailto:raghunath.0087@gmail.com" rel="nofollow ugc">raghunath.0087@gmail.com</a>
For documentation, FAQs, and troubleshooting, visit: <a href="https://www.wp-experts.in/contact-us/?http-reffer=wpotp-plugin" rel="nofollow ugc">Plugin Documentation</a>
<h3>Security Notice</h3>
This plugin relies on OTP for authentication, which is more secure than traditional passwords. However, it is crucial to ensure your website uses HTTPS to encrypt communication and prevent unauthorized access. Always keep your WordPress and plugin versions up to date for the latest security fixes.
<h3>License</h3>
This plugin is licensed under the GPL-2.0+ license. See the full license text at: http://www.gnu.org/licenses/gpl-2.0.html

Login with OTP

Login with OTP for WordPress and WooCommerce. Secure your site by replacing static passwords with One Time Password (OTP) for login.

Google Authenticator vs Login with OTP