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Breaking ReCAPTCHAv2 (arxiv.org)
5 points by GaggiX on Sep 20, 2024 | hide | past | pdf | discuss on HN

In plain words: An image-recognition system finds and clicks the right squares in reCAPTCHA picture puzzles, letting a bot pass the human check. It cleared every test puzzle, while earlier automated attempts only solved 68–71% of them.

Abstract · Breaking reCAPTCHAv2

Our work examines the efficacy of employing advanced machine learning methods to solve captchas from Google's reCAPTCHAv2 system. We evaluate the effectiveness of automated systems in solving captchas by utilizing advanced YOLO models for image segmentation and classification. Our main result is that we can solve 100% of the captchas, while previous work only solved 68-71%. Furthermore, our findings suggest that there is no significant difference in the number of challenges humans and bots must solve to pass the captchas in reCAPTCHAv2. This implies that current AI technologies can exploit advanced image-based captchas. We also look under the hood of reCAPTCHAv2, and find evidence that reCAPTCHAv2 is heavily based on cookie and browser history data when evaluating whether a user is human or not. The code is provided alongside this paper.

Andreas Plesner, Tobias Vontobel, Roger Wattenhofer
arXiv:2409.08831 · cs.CV · submitted Sep 13, 2024
abstract · pdf · html · 10 pages. Accepted at COMPSAC 2024

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Also discussed: Sep 2024 (3 points, 2 comments)