1. First Attaining Public and Provate Key for reCAPTCHA
First request key for your domain from Here (you have to signup first and then add domains)
2. Executing DB queries for easy adminstration
the following add reCAPTCHA choice to your IPB ACP as a way for CAPTCHA and provides means for entering public & private keys without editiing files :-
you may do following using phpmyadmin Or mysql console or any other MySql client / interface
Assuming your table prefix is "ibf" (This is important replace "ibf" with your own prefix) & default IPB installation
On doing this if you log into ACP -> Tools & Setting -> Security & Privacy you should see something like this
3. File Edits
go to file /upload/sources/action_public/register.php
1)find
after it add
2) find
Replace with
3) find
after it add
4) Library Downloading
download reCAPTCHA php library from Here
unpack the library and put the file recaptchalib.php in IPB Root direcotry
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And Thats It .... !!!
if a member now registers he will see something like this