Skip to main content
placeholder image

Attacking animated CAPTCHAs via character extraction

Journal Article


Abstract


  • It is widely accepted that one of the principles in state-of-the-art text-based CAPTCHA design, requires that a robust CAPTCHA scheme be segmentation-resistant. This paper establishes the fact that the segmentation-resistant principle does not only apply to traditional single image CAPTCHAs, but is very much relevant to the design of animated CAPTCHAs. In this paper, we show that animated CAPTCHAs not designed with this principle in mind can be easily be broken using simple techniques to extract individual characters from the animation frames. We present our experimental results on attacking 13 existing animated CAPTCHAs. © Springer-Verlag 2012.

  • It is widely accepted that one of the principles in state-of-the-art text-based CAPTCHA design, requires that a robust CAPTCHA scheme be segmentation-resistant. This paper establishes the fact that the segmentation-resistant principle does not only apply to traditional single image CAPTCHAs, but is very much relevant to the design of animated CAPTCHAs. In this paper, we show that animated CAPTCHAs not designed with this principle in mind can be easily be broken using simple techniques to extract individual characters from the animation frames. We present our experimental results on attacking 13 existing animated CAPTCHAs. © Springer-Verlag 2012.

Publication Date


  • 2012

Citation


  • Nguyen, V., Chow, Y. & Susilo, W. (2012). Attacking animated CAPTCHAs via character extraction. Lecture Notes in Computer Science, 7712 (N/A), 98-113. Darmstadt Attacking animated CAPTCHAs via character extraction

Scopus Eid


  • 2-s2.0-84872695710

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/207

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 98

End Page


  • 113

Volume


  • 7712

Place Of Publication


  • Germany

Abstract


  • It is widely accepted that one of the principles in state-of-the-art text-based CAPTCHA design, requires that a robust CAPTCHA scheme be segmentation-resistant. This paper establishes the fact that the segmentation-resistant principle does not only apply to traditional single image CAPTCHAs, but is very much relevant to the design of animated CAPTCHAs. In this paper, we show that animated CAPTCHAs not designed with this principle in mind can be easily be broken using simple techniques to extract individual characters from the animation frames. We present our experimental results on attacking 13 existing animated CAPTCHAs. © Springer-Verlag 2012.

  • It is widely accepted that one of the principles in state-of-the-art text-based CAPTCHA design, requires that a robust CAPTCHA scheme be segmentation-resistant. This paper establishes the fact that the segmentation-resistant principle does not only apply to traditional single image CAPTCHAs, but is very much relevant to the design of animated CAPTCHAs. In this paper, we show that animated CAPTCHAs not designed with this principle in mind can be easily be broken using simple techniques to extract individual characters from the animation frames. We present our experimental results on attacking 13 existing animated CAPTCHAs. © Springer-Verlag 2012.

Publication Date


  • 2012

Citation


  • Nguyen, V., Chow, Y. & Susilo, W. (2012). Attacking animated CAPTCHAs via character extraction. Lecture Notes in Computer Science, 7712 (N/A), 98-113. Darmstadt Attacking animated CAPTCHAs via character extraction

Scopus Eid


  • 2-s2.0-84872695710

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/207

Has Global Citation Frequency


Number Of Pages


  • 15

Start Page


  • 98

End Page


  • 113

Volume


  • 7712

Place Of Publication


  • Germany