• A type of challenge-response test used to ensure that the response is generated by a human
    • The tests are used to prevent unwanted Internet robots from accessing web sites
    • One test requires the user to type characters from a distorted image on the screen
  • An acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart"
  • Used to prevent automated postings that could degrade quality of service of a site

Sitecore CAPTCHA Support in WFFM

  • There are two fields associated with CAPTCHA in Web Forms for Marketers (WFFM)
    • The CAPTCHA image
    • The CAPTCHA text confirmation field
  • The user would enter the text from the image in the text field to avoid robot registrations
  • The line noise, background noise, and font warp can be set in the properties

CAPTCHA ASP.NET Server Control

  • Can be set to any size with a variety of fonts
  • Can set any string length and alphabet, not just English
  • Can set the level of noise and line noise
  • Includes a timer to make the CAPTCHA obsolete after a specified period
  • Available from Mondor Software for free