Authen::captcha provides an object oriented interface to captcha file creations. captcha stands for completely automated public turing test to tell computers and humans apart. a captcha is a program that can generate and grade tests that:

- most humans can pass.
- current computer programs can't pass.
the most common form is an image file containing distorted text, which humans are adept at reading, and computers (generally) do a poor job. this module currently implements that method.