Newcastle Authors	Title	Year
Ahmad El Ahmad Dr Jeff Yan	CAPTCHA Design Color, Usability, and Security	2012
Dr Jeff Yan Ahmad El Ahmad	Captcha Robustness: A Security Engineering Perspective	2011
Ahmad El Ahmad Dr Jeff Yan Mohamad Tayara	The Robustness of Google CAPTCHAs	2011
Ahmad El Ahmad Dr Jeff Yan	Colour, usability and security: a case study	2010
Dr Jeff Yan Ahmad El Ahmad	CAPTCHA Security: A Case Study	2009
Dr Jeff Yan Ahmad El Ahmad	The Robustness of CAPTCHAs: A Security Engineering Perspective	2009
Dr Jeff Yan Ahmad El Ahmad	A low-cost attack on a Microsoft CAPTCHA	2008
Dr Jeff Yan Ahmad El Ahmad	Breaking Visual CAPTCHAs with Naive Pattern Recognition Algorithms	2007

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