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CAPTCHAs are not a perfect solution. Any skilled, diligent cracker will eventually be able to bypass a CAPTCHA, but it should be able to shut down your average script-kiddie.
When a CAPTCHA is created with this module, raw image data is transmitted from your web application to the client browser. A cookie containing a checksum is also transmitted with the image. When the client submits their form for processing (along with their verification of the random string), captcha_verify() generates a checksum of the verification string the user entered. If the newly generated checksum matches the checksum found in the cookie, the CAPTCHA is assumed to have been successfully entered, and the user is allowed to continue processing their form.
CGI::Application:UsergContribuCGI::Application::Plugin::CAPTCHA(3pm) NAME CGI::Application::Plugin::CAPTCHA - Easily create, use, and verify CAPTCHAs in CGI::Application-based web applications. VERSION Version 0.04 SYNOPSIS # In your CGI::Application-based web application module. . . use CGI::Application::Plugin::CAPTCHA; sub setup more»
libcgi-application-plugin-captcha-perl (0.04-1) unstable; urgency=low * Split off from libcgi-application-extra-plugin-bundle-perl (Closes: #646968). -- Nicholas Bamber <email@example.com> Thu, 10 Nov 2011 21:53:10 +0000
Revision history for CGI-Application-Plugin-CAPTCHA 0.04 01/07/2011 Added GitHub repo link Fixed module dependencies. 0.03 01/04/2011 Forgot to add Digest::SHA1 to list of dependencies. 0.02 01/04/2011 Skip some tests if Test::WWW::Mechanize is not available (RT#17146, by ZACKSE) Test tweaks Fixed various issues with Module::Build more»
Format-Specification: http://anonscm.debian.org/viewvc/dep/web/deps/dep5.mdwn?view=markup&pathrev=13 more»