Ideas for CAPTCHA's

CAPTCHA:

Completly Automated Public Turing test to tell Computers and Humans Apart

Use an image map with a large clear area and a "SUBMIT" button somewhere in that area. Only accept submitions that include coordinates in that area. Move the area from one instance to the next. Pro: User doesn't even know they are doing it, Con: bot might randomly get it right, requires mouse click rather than Enter key.

Move captcha off the main page to a preview page with spell check, linkup and other services.

See also:

• http://en.wikipedia.org/wiki/Captcha
• http://amix.dk/blog/viewEntry/19338
• http://www.captcha.com
• captchas.net offers an image captcha as a service
• http://www.wp-plugins.net/wiki/index.php?title=SK2 is a zen, anti wiki spam, add in for the wordpress blogging software. It implements many tests that are not seen by the user at all.

Questions:

Comments:

• Smaller images can be implemented in tables by setting the size of each cell to 1 or 2 pixels and the back ground color to that of the image pixel at those coordinates.

Code: