I recently had to delete several dangerous SPAM comments from my blog. While most of the comments were just plain old SPAM there was one or two that were very dangerous and had links to sites that would almost immediately infect a computer with all sorts of nasty spyware including root kits.

While I’m not a security expert I do spend a lot of my time performing network security related tasks. So I started wondering how is this SPAM was getting by Google’s CAPTCHA engine?

After performing some research I found a very interesting Google Tech Talk presentation on Human Computation. The initial part of the discussion describes CAPTCHA and how some folks are trying to circumvent the solution.

You can find all the Google Tech Talks here.

Cheers!