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Breaking the 4Chan CAPTCHA
In this blog post, I will talk about my successful experiment in machine learning using TensorFlow to automate solving the 4Chan CAPTCHA.
Many users find the "slider" style CAPTCHAs incredibly frustrating, but I've had a 100% success rate in aligning them with the heuristic script I made ( trainer/captcha_aligner.py). When extracting the digits, I observed a few patterns in how the characters are usually clustered or spread apart, and so I wrote my script to assemble images with backgrounds according to these formulas. I found this out from a forum post, after I spent a bit of time puzzling out why TFJS wouldn't read the model that the official conversion script output.
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