Aaron D. Campbell

Sometimes it’s a private blog, and that’s all there is to it. If all you want 
to do is limit your blog to only registered users, look no further. Simply 
install this plugin, and stop worrying.

Authenticate

Instantly requires that users be logged in to visit your site. Also serves as a good base for expansion. No interface, just activate and go!  Requires …

token2

Token2 helps you proctect your WordPress site from hackers using simple two-factor authentication.
You can get your free API key at <a href="https://www.token2.com/manage" rel="nofollow ugc">www.token2.com</a>.
Plugin development is found at Token2.com

Token2 Two Factor Authentication

Review1

Protect your WordPress site with Token2 two-factor authentication

Authenticate vs Token2 Two Factor Authentication