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Authors: David Holm Audran ; Marcus Braunschweig Andersen ; Mark Højer Hansen ; Mikkel Møller Andersen ; Thomas B. Frederiksen ; Kasper H. Hansen ; Dimitrios Georgoulias and Emmanouil Vasilomanolakis

Affiliation: Aalborg University, Copenhagen, Denmark

Keyword(s): Darkweb, CAPTCHA, Web Crawler, Machine Learning, Darkweb Marketplace, Darkweb Forum.

Abstract: Nowadays, almost all major websites employ CAPTCHAs. This prevents website scraping, fake account creation as well as DDoS or bruteforce attacks. For anonymity reasons, mainstream CAPTCHAs such as Google’s reCAPTCHA cannot be used on the darkweb. Due to the evolution of machine learning and computer vision, the CAPTCHA challenges used there, such as the clock CAPTCHA, are usually more arduous than those found on the clearweb. This paper presents an automated system that uses machine learning to break clock CAPTCHA challenges with a high success rate. We evaluate our system in a real world setting against 725 clock challenges from live darkweb marketplaces. Our results show an accuracy of 96.83% while maintaining low time requirements while analyzing, predicting and submitting the CAPTCHA solution.

CC BY-NC-ND 4.0

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Paper citation in several formats:
Audran, D.; Andersen, M.; Hansen, M.; Andersen, M.; Frederiksen, T.; Hansen, K.; Georgoulias, D. and Vasilomanolakis, E. (2022). Tick Tock Break the Clock: Breaking CAPTCHAs on the Darkweb. In Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT; ISBN 978-989-758-590-6; ISSN 2184-7711, SciTePress, pages 357-365. DOI: 10.5220/0011273300003283

@conference{secrypt22,
author={David Holm Audran. and Marcus Braunschweig Andersen. and Mark Højer Hansen. and Mikkel Møller Andersen. and Thomas B. Frederiksen. and Kasper H. Hansen. and Dimitrios Georgoulias. and Emmanouil Vasilomanolakis.},
title={Tick Tock Break the Clock: Breaking CAPTCHAs on the Darkweb},
booktitle={Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT},
year={2022},
pages={357-365},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0011273300003283},
isbn={978-989-758-590-6},
issn={2184-7711},
}

TY - CONF

JO - Proceedings of the 19th International Conference on Security and Cryptography - SECRYPT
TI - Tick Tock Break the Clock: Breaking CAPTCHAs on the Darkweb
SN - 978-989-758-590-6
IS - 2184-7711
AU - Audran, D.
AU - Andersen, M.
AU - Hansen, M.
AU - Andersen, M.
AU - Frederiksen, T.
AU - Hansen, K.
AU - Georgoulias, D.
AU - Vasilomanolakis, E.
PY - 2022
SP - 357
EP - 365
DO - 10.5220/0011273300003283
PB - SciTePress

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