Mathcha is a horribly-named, arithmetic-based, text-driven captcha. Why you ask? For very few good reasons:
This thing is nascent, fledgling, and was produced in a matter of hours. I haven't thoroughly tested it yet so don't put too much faith in it. Please feel free to fork and dress up. I plan on staying on top of this over the next few weeks and getting something put together that I'm happy to push on my peers.
First, install the gem:
sudo gem install mathcha
Next, modify your config/environment.rb to reference the mathcha gem:
config.gem "mathcha", :source => "http://gemcutter.org"
In your view (this will dump the proper input and a hidden key field)
<%= mathcha_tag %>
In your controller
if (verify_mathcha(params))
Copyright (c) 2009 Cory Wilkerson, released under the MIT license
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We found that mathcha demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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