How to implement captcha in Rails?

Hi,

How to implement captcha (image verification to prevent automated
registrations) in Rails?

Need to do this for a project I’m working on.

I Googled some, but the likely looking links - this was one -
http://frankhale.org/CAPTCHA_RoR_Tutorial.html - were down.

Thanks
Vasudev Ram
http://www.dancingbison.com

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