Keep Spambots Out with a Simple Math CAPTCHA
Spambots are undoubtably among the most annoying problems for web developers. They look for forms on your site, and submit links to their own websites, repeated many times and mixed with keywords. One way to deter them is a CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart). One common form of this is an image with distorted letters, and the user has to type in the letters. I find those really annoying, and unless you are very popular you probably don’t need something so difficult to crack. Our CAPTCHA will ask the user to answer an addition problem.
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