| The memorability and security of passwords–some empirical results J Yan, A Blackwell, R Anderson, A Grant University of Cambridge, Computer Laboratory, 2000 | 1030* | 2000 |
| Security and usability: designing secure systems that people can use LF Cranor, S Garfinkel " O'Reilly Media, Inc.", 2005 | 655 | 2005 |
| A Low-cost Attack on a Microsoft CAPTCHA J Yan, AS El Ahmad Proceedings of the 15th ACM conference on Computer and communications …, 2008 | 561 | 2008 |
| Usability of CAPTCHAs or usability issues in CAPTCHA design J Yan, AS El Ahmad Proceedings of the 4th symposium on Usable privacy and security, 44-52, 2008 | 415 | 2008 |
| Targeted Online Password Guessing: An Underestimated Threat D Wang, Z Zhang, P Wang, J Yan, X Huang ACM Conference on Computer and Communications Security (CCS), 2016 | 368 | 2016 |
| Breaking visual captchas with naive pattern recognition algorithms J Yan, AS El Ahmad ACSAC'07, Twenty-Third Annual Computer Security Applications Conference …, 2007 | 358 | 2007 |
| Do background images improve draw a secret graphical passwords? P Dunphy, J Yan Proceedings of the 14th ACM conference on Computer and communications …, 2007 | 324 | 2007 |
| A systematic classification of cheating in online games J Yan, B Randell Proceedings of 4th ACM SIGCOMM workshop on Network and system support for …, 2005 | 281 | 2005 |
| Captcha as Graphical Passwords–A New Security Primitive Based on Hard AI Problems BB Zhu, J Yan, G Bao, M Yang, N Xu IEEE transactions on information forensics and security 9 (6), 891-904, 2014 | 200 | 2014 |
| Attacks and design of image recognition CAPTCHAs BB Zhu, J Yan, Q Li, C Yang, J Liu, N Xu, M Yi, K Cai Proceedings of the 17th ACM conference on Computer and communications …, 2010 | 192 | 2010 |
| Shoulder surfing defence for recall-based graphical passwords NH Zakaria, D Griffiths, S Brostoff, J Yan Proceedings of the seventh symposium on usable privacy and security, 1-12, 2011 | 173 | 2011 |
| Security issues in online games J Yan, HJ Choi The Electronic Library 20 (2), 125-133, 2002 | 168 | 2002 |
| The memorability and security of passwords–some empirical results J Yan, A Blackwell, R Anderson, A Grant University of Cambridge, Computer Laboratory, 2000 | 167 | 2000 |
| The memorability and security of passwords–some empirical results J Yan, A Blackwell, R Anderson, A Grant University of Cambridge, Computer Laboratory, 2000 | 167 | 2000 |
| A note on proactive password checking J Yan Proceedings of the 2001 workshop on New security paradigms, 127-135, 2001 | 145 | 2001 |
| The robustness of Google CAPTCHAs AS El Ahmad, J Yan, M Tayara Newcastle University, School of Computing Science Technical Report Series, 2011 | 124* | 2011 |
| A simple generic attack on text captchas H Gao, J Yan, F Cao, Z Zhang, et al NDSS'16, 2016 | 100 | 2016 |
| A Simple Generic Attack on Text Captchas H Gao, J Yan, F Cao, Z Zhang, L Lei, M Tang NDSS, 0 | 100 | |
| The robustness of a new CAPTCHA AS El Ahmad, J Yan, L Marshall Proceedings of the Third European Workshop on System Security, 36-41, 2010 | 99 | 2010 |
| Graphical passwords & qualitative spatial relations D Lin, P Dunphy, P Olivier, J Yan Proceedings of the 3rd symposium on Usable privacy and security, 161-162, 2007 | 96 | 2007 |
Ahmad S. El AhmadPhD Computer Science, Newcastle UniversityVerified email at ncl.ac.uk
