gpaterno

A lot of web sites, even well known ones (newspapers, telcos, …) adopts 
WordPress as their CMS. WordPress is a great platform, however it 
can happen that password leaking or guessing might lead to unauthorized 
access to the platform. A potential attacker can be therefore able to 
change articles, part of the web site and/or make the website unavailable, 
with image and economic damages for a company or for a blogger. 
This is even more true if your website is not SSL protected.
SecurePass is a SaaS service offering an easy and affordable solution 
for One Time Passwords (OTP) and strong authentication in general. They 
offer 5 users for free included with their standard (=basic) account, which 
is more than enough for standard blogs and web sites. Companies can purchase 
additional users, if needed.
More information on the section “Setup and configure SecurePass” in Other Notes. 
To open a SecurePass account go to http://www.secure-pass.net/open
<h3>Setup and configure SecurePass</h3>
If you don’t own already an account with SecurePass, you can sign-up for a new account here: http://www.secure-pass.net/open
Note: Use “misec2011” as promo code, it will give you an entitlement for using 
SecurePass up to 10 users for 2 years free-of-charge. Without any promo code, 
you will have 5 users for 20 years for free. It depends on what you need (more users or more years).
Connect to the admin interface on https://admin.secure-pass.net 
and create a new device (basically a RADIUS client).
In the admin interface, go to the “Device” section and add a new device. 
You will need to set the public IP Address of the server, a fully qualified 
domain name (FQDN), and the secret password for the radius authentication. 
It’s ok if your web server is behind a firewall and/or NAT, ensure that 
your server has rights to send (and receive) RADIUS authentication requests, 
i.e. UDP port 1812.
<h3>Further reading</h3>
<ul>
<li>
This plugin web site: 
https://github.com/gpaterno/wp-securepass/
</li>
<li>
SecurePass web site: 
http://www.secure-pass.net/
</li>
<li>
UK on-line shop for SecurePass (they sell hardware tokens): 
http://shop.nervinesecurity.com/
</li>
</ul>

SecurePass authentication

This is a plugin to autheticate users through the SecurePass One Time Passwords service.

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.

SecurePass authentication vs Google Authenticator