18-Aug-2009 1:07AM CDT
As you may have noticed, I recently re-enabled comments on my websites. Almost as soon as I had finished this effort, I started getting spam comments. How there are bots out there that found my website and decoded what it took to post a comment, I don't think I'll ever know.
The common way to fight automated posting is through the use of CAPTCHAs. These operate on the premise that there are things that humans can read that are still things that are exceedingly hard for computers to decipher. After encountering the spam problem, I decided to investigate adding CAPTCHAs for the comments.
Of course this will only help until someone rights a better computer vision algorithm that can figure out the words in the images. Oh well.
The other nice thing about reCAPTCHA is that it is actually used to help with the electronic scanning of books.