It's not hard to write a script that will, at random group together a set of several images, each containing a number or letter. You would just need to have, for example, 36 small image files in order to display the letters A-Z (from the English alphabet) and 0-9. A little creativity could obscure the character images with visually distinguishable 'noise', that would be adequate to thwart most web spiders. That doesn't really require a module.

For your CGI parameter handling needs, use the CGI.pm module.

But bear in mind that such a strategy for authentication will run amok with the Americans with Disabilities Act people, as well as essentially denying access to anyone who is sufficiently visually impared. It's like hanging a "Handicap not welcome here" sign on your storefront.

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