Though strictly not part of the security API, it might be useful in certain circumstances (such as new user registrations, posting to a public blog or forum) to implement a Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart) to prevent automated bots from interacting with your application. Seam provides seamless integration with JCaptcha, an excellent library for generating Captcha challenges. If you wish to use the captcha feature in your application you need to include the jcaptcha-* jar file from the Seam lib directory in your project, and register it in application.xml as a java module.