November 2nd, 2011

VouchSafeVouchSafe is an easy, effective replacement for CAPTCHAs that requires users to simply draw a line to join two objects that are related, or to circle an object that doesn’t belong in a collection. VouchSafe is the only Human Interactive Proof that uses an adaptive AI to generate challenges and to learn from the selections that people make.

VouchSafe is people-friendly, extremely secure, and works on most smart phones and tablet computers. An audio-based challenge is available for visually or motor-imapaired users.

The VouchSafe plugin is a simple installation that automatically protects your choice of contact forms, user registration, or both. The plugin is available for Joomla 1.5 and 1.7.

Site operators can register for an optional api key at in order to activate vouchsafe on their domain. Your registration keyset allows you to customize the way the VouchSafe challenge appears on each of your domains.

You can simply and install and run the plugin without registering for an API key, in which case it will simply be displayed with the default settings and interface color.