Microsoft Office Tutorials and References
In Depth Information
There are three different CAPTCHA "challenges" available with the module,
Math (this uses plain text, and does not have any accessibility issues linked to
the image type)
There is an Examples tab on the same page to see how each of these works.
The math CAPTCHA challenge presents the user with a basic math sum to complete,
as shown by the example below:
The image challenge presents the user with an image containing a number of
characters. We can select the font type and the level of noise or distortion in the
background for the characters used from the Image CAPTCHA tab. The user must
then correctly enter the characters from the image, which can in some cases be
difficult to read, into a text box.