Reading suggestions from DEFCON 17. Go to the DEFCON website for videos of the talks.

Screen scraper tricks (focus on iMacros)

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Decaptcher has a TCP socket and an HTTP API. This is a description of the socket API, deciphered from Decaptcher’s official PHP client. You can also look at my version of the Decaptcher PHP client that I posted recently. The following will come in handy if you’d like to code your own client.
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I rewrote Decaptcher’s PHP monstrosity yesterday. My version is a single class and doesn’t use three dozen constants. You can find the source below:

http://svn.blackhat-seo.com/stuff/php/Decaptcher/

The one greatest vulnerability of captchas is the mechanical turk. If a human can solve it, which is not always the case these days, then you can find people that will solve a thousand captchas for a dollar.

Captcha farm services

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A few months ago, I wrote a small PHP class to help me create chainable interfaces (PHP people like to call these “fluent interfaces”) without having to retrofit old code. I call this DeferredChain.

Here is the source for DeferredChain.

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