1 / 6

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.

koen
Télécharger la présentation

Captcha Breaker

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related