Christos A. Fidas
Artemios G. Voyiatzis
Nikolaos M. Avouris
ABSTRACT
A "Completely Automated Public Turing test to tell Computers and Humans Apart" (CAPTCHA) is a mechanism widely used nowadays for protection of web applications, interfaces, and services from malicious users. A questionnaire-based survey combined with a real usage scenario of a native-language CAPTCHA mechanism was conducted in order to investigate several aspects that affect end-user perceptions related to the quality of CAPTCHA. A total of 210 participants of age between 19 and 64 participated during May and July 2010. The survey results validate the common belief that CAPTCHAs are still difficult for humans to solve. They also provide insights that can be applied to improve users' experience on interacting with CAPTCHA systems.
- A. El Ahmad, J. Yan, and L. Marshall. The Robustness of a New CAPTCHA. In Proc. of the Third European Workshop on System Security (EUROSEC '10). ACM, New York, NY, USA, 36--41. Google Scholar
Digital Library
- L. von Ahn, M. Blum, and J. Langford. Telling humans and computers apart automatically. Commun. ACM 47, 2 (February 2004), 56--60. Google ScholarDigital Library
- S. Bohr, A. Shome, and J. Simon. Improving auditory CAPTCHA security. ISR Tech. rep., University of Maryland, College Park, MD 2008.Google Scholar
- R. Chow, P. Gollé, M. Jakobsson, X. Wang, and L. Wang. Making CAPTCHAs clickable. In Proc. of the 9th workshop on Mobile computing systems and applications (HotMobile '08). ACM, New York, NY, USA, 91--94. Google ScholarDigital Library
- C.J. Hernandez-Castro and A. Ribagorda. Pitfalls in CAPTCHA design and implementation: The Math CAPTCHA, a case study. Computers & Security, 29, 1 (2010), 141--157.Google ScholarDigital Library
- J. Holman, J. Lazar, J. Feng, and J. d'Arcy. Developing Usable CAPTCHAs for Blind Users. In Proc. of the 9th SIGACCESS conference on Computers and Accessibility (Assets '07). ACM, New York, NY, USA, 245--246. Google ScholarDigital Library
- K.A. Kluever and R. Zanibbi. Balancing usability and security in a video CAPTCHA. In Proc. of the 5th Symposium on Usable Privacy and Security (SOUPS '09). ACM, New York, NY, USA, Article 14 , 11 pages. Google ScholarDigital Library
- S. Li, S.A.H. Shah, M.A.U. Khan, S.A. Khayam, A.-R. Sadeghi, and R. Schmitz. Breaking e-Banking CAPTCHAs. In Proc. of 26th Annual Computer Security Applications Conference (ACSAC 2010), Austin, Texas, USA, December 6--10, 2010, 171--180. Google ScholarDigital Library
- M. Motoyama, K. Levchenko, C. Kanich, D. McCoy, G.M. Voelker, and S. Savage. Re: CAPTCHAs-Understanding CAPTCHA-solving services in an economic context. In Proc. of the 19th USENIX Security Symposium, USENIX Association, 435--462. Google ScholarDigital Library
- B. Pinkas and T. Sander. Securing Passwords Against Dictionary Attacks. In Proc. of the 9th ACM conference on Computer and communications security (CCS '02), ACM, New York, NY, USA, 161--170. Google ScholarDigital Library
- 1J. Tam, J. Simsa, S. Hyde, and L. Von Ahn. Breaking Audio CAPTCHAs. In Proc. of the 22nd Annual Conference on Neural Information Processing Systems 2008, MIT Press, 1625--1632.Google Scholar
- J. Yan and A.S. El Ahmad. Breaking Visual CAPTCHAs with Naïve Pattern Recognition Algorithms. In Proc. of. ACSAC 2007. IEEE Computer Society, 279--291.Google Scholar
- J. Yan and A.S. El Ahmad. The Robustness of CAPTCHAs: A Security Engineering Perspective. Newcastle Univ. Tech. rep. CS-TR-1180, Nov. 2009.Google Scholar
- J. Yan and A.S. El Ahmad. Usability of CAPTCHAs or usability issues in CAPTCHA design. In Proc. of SOUPS '08. ACM, New York, NY, USA, 44--52.. Google ScholarDigital Library
Index Terms
- On the necessity of user-friendly CAPTCHA
Recommendations
Usability of CAPTCHAs or usability issues in CAPTCHA design
SOUPS '08: Proceedings of the 4th symposium on Usable privacy and securityCAPTCHA is now almost a standard security technology, and has found widespread application in commercial websites. Usability and robustness are two fundamental issues with CAPTCHA, and they often interconnect with each other. This paper discusses ...
CAPTCHA: Impact of Website Security on User Experience
ICIIT '19: Proceedings of the 2019 4th International Conference on Intelligent Information TechnologyAs currently many people use the Internet to access websites, Internet security becomes an important topic. One popular security mechanism is Captcha or Completely Automated Public Turing Computer and Humans Apart, which determine whether or not the ...
Optimising CAPTCHA Generation
ARES '11: Proceedings of the 2011 Sixth International Conference on Availability, Reliability and SecurityCAPTCHA is a test that can, automatically, tell human and computer programmes apart. It is now almost a standard security technology, and has found widespread application on commercial websites. Robustness and usability are two fundamental aspects with ...
Comments