dacalleg

This plugin allows you to interface wordpress with the <a href="https://play.google.com/store/apps/details?id=com.dacalleg.wordpressmobilesecurity" rel="nofollow ugc">“Mobile Security for WordPress”</a> app. 
After installing the plugin you will see a qr-code to frame with the app.
The plugin will periodically collect data on:
<ul>
<li>Requests</li>
<li>Status codes</li>
<li>Errors</li>
<li>Ip Addresses</li>
<li>User-Agent</li>
<li>Miscellaneous Statistics</li>
</ul>
In addition to this information from the app will be possible:
<ul>
<li>View the version of WordPress</li>
<li>View requests in real time</li>
<li>View requests grouped by IP</li>
<li>Assign a name to an IP address</li>
<li>Lock IP addresses permanently</li>
<li>Lock IP addresses temporarily</li>
<li>Enable IP addresses</li>
<li>Disable XMLRPC</li>
<li>Disable login</li>
<li>Enable login</li>
<li>View statistics</li>
<li>View how many Bots or Humans visit the site</li>
<li>Enable maximum request quotas per ip address (in case the quota will be reached the ip address will be blocked for 15 minutes)</li>
<li>View users</li>
<li>Modify users</li>
<li>View errors and where they occur</li>
<li>Manage notifications</li>
<li>Filter requests</li>
</ul>
All communication between the app and the site is done in a secure way, to access the API exposed by the plugin you need a secret key that is 
generated when the plugin is installed and communicated to the app via QR Code. You can also replace the secret key by generating a new one from the plugin preferences.
The Safe Login feature allows you to disable the login (showing a 403 screen). Very useful to avoid Brute Force attacks. 
Login can be reactivated temporarily or permanently via the app.

Mobile WP Security

This plugin exposes the rest APIs to be able to control some aspects of wordpress security via the mobile app "Mobile Security for Wordpress&quot …

mobisoft

Relais 2FA allows you to improve your site by adding an authentication method. 
The principlee is simple: enter your email and then scan the QR code shown. No password needed.
<h3>Donations</h3>

Relais 2FA

Relais 2FA allows you to improve your site by adding an authentication method.

Mobile WP Security vs Relais 2FA