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the art of breaking and designing captchas

The art of breaking and designing captchas Elie Bursztein Session - PowerPoint PPT Presentation

Sep 04, 2023 •435 likes •2.36k views

The art of breaking and designing captchas Elie Bursztein Session ID: HT02-402 Insert presenter logo here Session Classification: xxxxxxxxxxxx on slide master. See hidden slide 4 for direc6ons Insert presenter logo here on slide master.

  1. Anti-recognition techniques Blurring Distortion Rotation Fonts 0123456789 Charsets E lie Bursztein (@elie) http://elie.im 18

  2. SVM learning rate 100% 90% 80% 70% % success 60% 50% 09 40% AZ09 30% azAZ09 Distortion 20% 3 fonts 5 fonts 10% Angles 0% 10 20 50 100 200 500 Trainning set size E lie Bursztein (@elie) https://elie.net 19

  3. KNN learning rate 100% 90% 80% 70% % success 60% 50% 09 40% AZ09 azAZ09 30% Distortion 20% 3 fonts 5 fonts 10% Angles 0% 10 20 50 100 200 500 Trainning set size E lie Bursztein (@elie) https://elie.net 20

  4. Anti-recognition taxonomy E lie Bursztein (@elie) http://elie.im 21

  5. Anti-recognition taxonomy Background Confusion E lie Bursztein (@elie) http://elie.im 21 Background confusion

  6. Anti-recognition taxonomy Background Confusion E lie Bursztein (@elie) http://elie.im 21 Background confusion

  7. Anti-recognition taxonomy Background Confusion E lie Bursztein (@elie) http://elie.im 21 Background confusion

  8. Anti-recognition taxonomy Background Confusion E lie Bursztein (@elie) http://elie.im 21 Background confusion

  9. Anti-recognition taxonomy Background Confusion Lines E lie Bursztein (@elie) http://elie.im 21 Background confusion

  10. Anti-recognition taxonomy Background Confusion Lines E lie Bursztein (@elie) http://elie.im 21 Background confusion

  11. Anti-recognition taxonomy Background Confusion Lines E lie Bursztein (@elie) http://elie.im 21 Background confusion

  12. Anti-recognition taxonomy Background Confusion Lines E lie Bursztein (@elie) http://elie.im 21 Background confusion

  13. Anti-recognition taxonomy Background Confusion Lines Collapsing E lie Bursztein (@elie) http://elie.im 21 Background confusion

  14. Anti-recognition taxonomy Background Confusion Lines Collapsing E lie Bursztein (@elie) http://elie.im 21 Background confusion

  15. Anti-recognition taxonomy Background Confusion Lines Collapsing E lie Bursztein (@elie) http://elie.im 21 Background confusion

  16. Anti-recognition taxonomy Background Confusion Lines Collapsing E lie Bursztein (@elie) http://elie.im 21 Background confusion

  17. Breaking World of Warcraft E lie Bursztein (@elie) http://elie.im 22

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