Telling humans and computers apart automatically

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Telling humans and computers apart automatically

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Communications of the ACM archive
Volume 47 , Issue 2 (February 2004) table of contents
Information cities

Pages: 56 - 60

Year of Publication: 2004

ISSN:0001-0782

Authors

Luis von Ahn	Carnegie Mellon University
Manuel Blum	Carnegie Mellon University
John Langford	Toyota Technological Institute at Chicago

Publisher

ACM New York, NY, USA

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Downloads (6 Weeks): 46, Downloads (12 Months): 346, Citation Count: 24

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ABSTRACT

How lazy cryptographers do AI.

REFERENCES

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Ahn, L. von, Blum, M., Hopper, N.J., and Langford, J. CAPTCHA: Telling humans and computers apart. In Advances in Cryptology, Eurocrypt '03, volume 2656 of Lecture Notes in Computer Science, (2003), 294--311.
	2	Ahn, L. von, Blum, M., Hopper, N.J., and Langford, J. The CAPTCHA Web page; www.captcha.net.
	3	Bongard, M.M. Pattern Recognition. Spartan Books, Rochelle Park, NJ, 1970.
	4	Chan, N. Program Byan; drive.to/research.
	5	Allison L. Coates, Pessimal Print: A Reverse Turing Test, Proceedings of the Sixth International Conference on Document Analysis and Recognition, p.1154, September 10-13, 2001
	6	Lillibridge, M.D., Abadi, M., Bharat, K., and Broder, A. Method for selectively restricting access to computer systems. U.S. Patent 6,195,698.
	7	Mori, G. and Malik, J. Recognizing objects in adversarial clutter---Breaking a visual CAPTCHA. In Proceedings of the Conference on Computer Vision and Pattern Recognition, June 2003.
	8	Naor, M. Verification of a human in the loop or identification via the Turing Test; www.wisdom.weizmann.ac.il/\~naor/PAPERS/human.ps.
	9	Benny Pinkas , Tomas Sander, Securing passwords against dictionary attacks, Proceedings of the 9th ACM conference on Computer and communications security, November 18-22, 2002, Washington, DC, USA [doi>10.1145/586110.586133]
	10	Turing, A.M. Computing machinery and intelligence. Mind 59, 236 (1950), 433--460.

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	Patrick Traynor , Patrick McDaniel , Thomas La Porta, On attack causality in internet-connected cellular networks, Proceedings of 16th USENIX Security Symposium on USENIX Security Symposium, p.1-16, August 06-10, 2007, Boston, MA
	Jonathan Holman , Jonathan Lazar , Jinjuan Heidi Feng , John D'Arcy, Developing usable CAPTCHAs for blind users, Proceedings of the 9th international ACM SIGACCESS conference on Computers and accessibility, October 15-17, 2007, Tempe, Arizona, USA
	Paul C. Van Oorschot , Stuart Stubblebine, On countering online dictionary attacks with login histories and humans-in-the-loop, ACM Transactions on Information and System Security (TISSEC), v.9 n.3, p.235-258, August 2006
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