CAPTCHaBreak

Showcase of an attack on CAPTCHaStar.

RUNNING:

  1. Close all Chrome windows and re-run it with --allow-file-access-from-files flag
  2. Open star.html
  3. Open console, execute find_min_fill_ratio()

options:

  • to load some other captcha, use the function load(), e.g.:

        load("getter3.php");  // "getter.php", "getter1.php", ... "getter19.php" will work
  • you can also specify the total number of bins per row/column:

        find_min_fill_ratio(30);   // default is 20