Items where Author is "El Ahmad, Ahmad Salah"

El Ahmad, Ahmad Salah and Yan, Jeff and Ng, Wai Yin (2012) CAPTCHA design : color, usability, and security. IEEE Internet Computing, 16 (2): 5959144. pp. 44-51. ISSN 1089-7801

Yan, Jeff and El Ahmad, Ahmad Salah (2011) Captcha robustness : a security engineering perspective. Computer, 44 (2): 5601666. pp. 54-60. ISSN 0018-9162

Yan, Jeff and El Ahmad, Ahmad Salah (2009) CAPTCHA security : a case study. IEEE Security and Privacy Magazine, 7 (4). pp. 22-28. ISSN 1540-7993

Yan, Jeff and El Ahmad, Ahmad Salah (2008) Usability of CAPTCHAs or usability issues in CAPTCHA design. In: SOUPS 2008 - Proceedings of the 4th Symposium on Usable Privacy and Security :. ACM, USA, pp. 44-52. ISBN 9781605582764

Yan, Jeff and El Ahmad, Ahmad Salah (2008) A low-cost attack on a Microsoft captcha. In: Proceedings of the 15th ACM conference on Computer and communications security - CCS '08 :. ACM, New York, pp. 543-554. ISBN 9781595938107