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Captcha Breaker

Captcha Breaker. 技巧很強壯的 大叔隊. Workflow Outline. Segmentation Human Visual System Segmentation Color Filling Segmentation Distortion Estimation Optical Character Recognition Template Matching Machine Learning / Pattern Recognition Vulnerability Hacking (depend on dataset). Segmentation.

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Captcha Breaker

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  1. CaptchaBreaker 技巧很強壯的大叔隊

  2. Workflow Outline • Segmentation • Human Visual System Segmentation • Color Filling Segmentation • Distortion Estimation • Optical Character Recognition • Template Matching • Machine Learning / Pattern Recognition • Vulnerability Hacking • (depend on dataset)

  3. Segmentation • Human Visual System Segmentation • Lin et al., Bio-Inspired Unified Model of Visual Segmentation System For Captcha Character Recognition, [NTU Master Thesis] • Color-Filling Segmentation • Jeff et al., A low-cost attack on a Microsoft captcha, [ACM CCS 08] • Distortion Estimation • G. Moy et al., Distortion Estimation Techniques in Solving Visual CAPTCHAs [IEEE CVPR 04]

  4. Optical Character Recognition • Template Matching • http://en.wikipedia.org/wiki/Template_matching • Machine Learning / Pattern Recognition • Machine Learning Approaches to CAPTCHA Recognition Requiring Minimal Image Processing, [www.cs.ou.edu/~amy/courses/cs5033_fall2008/Tidwell_Shadoan.pdf] • Breaking Visual CAPTCHAs with Naïve Pattern Recognition Algorithms [ACSAC07] • Using Machine Learning to Break Visual Human Interaction Proofs [NIPS 04]

  5. Template matching

  6. Dataset • Xun6 • reCaptcha • Gmail application website • China Websites • http://code.google.com/p/captcha-recognition/ • Free file host • http://en.wikipedia.org/wiki/JDownloader#Support_of_common_one-click_hosters

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