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CAPTCHA Generation as a Web Service

  • Conference paper
Human Interactive Proofs (HIP 2005)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 3517))

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Abstract

We present an implementation of CAPTCHA image generation as a REST-style web service, currently available at http://captchaservice.org. We argue that CAPTCHA generation is well suited to a web services approach, particularly one powered by open-source code, and discuss techniques for using such a service to protect weblogs from comment spam attacks.

We describe the captchservice.org API by example, and detail the workings of the two image-distortion techniques that the service offers. We also discuss accessibility objections to visual CAPTCHAs, describe our early attempts at non-visual alternatives, and summarize future development directions.

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References

  1. May, B.: Inaccessibility of Visually-Oriented Anti-Robot Tests, W3C Working Draft (November 5, 2003), Retrieved from http://www.w3.org/TR/turingtest/

  2. Mori, G., Malik, J.: Recognizing Objects in Adversarial Clutter: Breaking a Visual CAPTCHA. In: IEEE Conference on Computer Vision and Pattern Recognition, Madison, WI (June 2003)

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  3. Park, J.: Towards Semi-Permeable Blogging. Unpublished manuscript (2003), available at http://mod-pubsub.org/docs/semipermeable.html (to be published as a CommerceNet Technical Report)

  4. von Ahn, L., Blum, M., Langford, J.: Telling Humans and Computers Apart Automatically. Communications of the ACM 47(2) (2004)

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Author information

Authors and Affiliations

  1. Yahoo!, CommerceNet,  

    Tim Converse

Authors
  1. Tim Converse
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Editor information

Editors and Affiliations

  1. Computer Science & Engineering Dept, Lehigh University, 19 Memorial Dr West, 18017, Bethlehem, PA, USA

    Henry S. Baird

  2. Lehigh University, 18015, Bethlehem, PA, USA

    Daniel P. Lopresti

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© 2005 Springer-Verlag Berlin Heidelberg

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Converse, T. (2005). CAPTCHA Generation as a Web Service. In: Baird, H.S., Lopresti, D.P. (eds) Human Interactive Proofs. HIP 2005. Lecture Notes in Computer Science, vol 3517. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11427896_6

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  • DOI: https://doi.org/10.1007/11427896_6

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-26001-1

  • Online ISBN: 978-3-540-32117-0

  • eBook Packages: Computer ScienceComputer Science (R0)

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