How to Break CaptchaStar

Thomas Gougeon; Patrick Lacharme

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Paper

How to Break CaptchaStar

Topics: Web Applications and Services

In Proceedings of the 4th International Conference on Information Systems Security and Privacy ICISSP - Volume 1, 41-51, 2018 , Funchal, Madeira, Portugal

Authors: Thomas Gougeon and Patrick Lacharme

Affiliation: Normandie Universite, France

Keyword(s): CAPTCHA.

Abstract: Most of web sites adopt a Captcha system to distinguish malicious software from humans. This paper proposes an attack on a recent interactive image-based Captcha scheme, called CaptchaStar. The CaptchaStar was designed to be more secure and user friendly than existing solutions, however, as we show in this paper, it fails to meet these goals Nevertheless, the presented attack is very efficient, with a success rate for the attacker of 96% on the on-line version proposed by the authors. Moreover, the modification of CaptchaStar parameters (as noise addition) does not prevent our attack.

CC BY-NC-ND 4.0

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Paper citation in several formats:

Gougeon, T. and Lacharme, P. (2018). How to Break CaptchaStar. In Proceedings of the 4th International Conference on Information Systems Security and Privacy - ICISSP; ISBN 978-989-758-282-0; ISSN 2184-4356, SciTePress, pages 41-51. DOI: 10.5220/0006577600410051

@conference{icissp18,
author={Thomas Gougeon. and Patrick Lacharme.},
title={How to Break CaptchaStar},
booktitle={Proceedings of the 4th International Conference on Information Systems Security and Privacy - ICISSP},
year={2018},
pages={41-51},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006577600410051},
isbn={978-989-758-282-0},
issn={2184-4356},
}

TY - CONF

JO - Proceedings of the 4th International Conference on Information Systems Security and Privacy - ICISSP
TI - How to Break CaptchaStar
SN - 978-989-758-282-0
IS - 2184-4356
AU - Gougeon, T.
AU - Lacharme, P.
PY - 2018
SP - 41
EP - 51
DO - 10.5220/0006577600410051
PB - SciTePress