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Rob Petti
Computer Engineer, Geek, and Traceur
Computer Engineer, Geek, and Traceur


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Oh Sony... Why you so crazy?
How not to design a CAPTCHA

Unfortunately Sony missed the entire point of a CAPTCHA. Instead of using an obfuscated image which is difficult for computers to recognize the characters, they include the CAPTCHA's unobfuscated characters in HTML and use CSS and JavaScript to make the characters appear slightly distorted.

While taking a Digital Image and Video Processing class (EE 371R at, I picked up a summer hobby of writing CAPTCHA breakers. Most CAPTCHAs can be decoded with a combination of Gaussian edge detection and XOR difference analysis with known characters. However this one falls to a simple regex.
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Is it just me or are Google+'s friend suggestions just really wacky? I've never even heard of most of these people...
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Just added a Flattr button to my blog site. I probably won't get any clicks yet, since I hardly get any traffic, but I'm hoping to start a project or two that might get me a bit more notoriety. :)
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