Protect any Joomla! 1.6 forms with CAPTCHA. SecurityImages has been written a long time ago, born in 2004, first running under Mambo then rapidly Joomla! 1.0, 1.5 till today in Joomla! 1.6
For all those that still don’t know what a CAPTCHA is:
A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.
See the demo here, login to administrator backend with login=visitor and password=visitor
Read more: SecurityImages 6.0 for Joomla! 1.6

SecurityImages has been updated to version 6.0.3 and correct 1 bugs for both Joomla 1.7 and Joomla 2.5.
BUG: If enabled for Contacts, it prevents a backend administrator from saving contact details in the backend. It fails with a captcha error. This is because SecurityImages 6.0.2 and previous was enforcing a captcha entry, yet the backend cannot facilitate the display of the captcha.
You can click the link below and install as normal via the Extensions Manager. or use the update manager (updates will display in the Extensions Manager under Updates).
Full list of changes available in GIT commit 18c1209801195e1138d61db87496408c38d2f49f
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Protect any Joomla! forms with CAPTCHA. SecurityImages has been written a long time ago, born in 2004, first running under Mambo then rapidly Joomla! 1.0, 1.5 till today in Joomla! 1.6
For all those that still don’t know what a CAPTCHA is:
A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.
Read more: SecurityImages 6.0.2 for Joomla! 1.6/1.7/2.5
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