Password memorability and security: empirical results
Yan, J., Blackwell, A., Anderson, R. and Grant, A.
IEEE Security and Privacy Vol. 2, Issue 5, pp 25-31
IEEE Computer Society, 2004

Security Issues in Online Games
Yan, J. and Choi, H.-J.
The Electronic Library Vol. 20, Issue 2, pp 125-133
Emerald, 2002

The Memorability and Security of Passwords
Yan, J., Blackwell, A., Anderson, R. and Grant, A.
In Security and Usability: Designing Secure Systems that People Can Use,
Cranor, L.F. and Garfinkel, S. (eds.), pp 129-142
O'Reilly, 2005, ISBN 0-596-00827-9
Notes : Refereed.

A Low-cost Attack on a Microsoft CAPTCHA
Yan, J. and Salah El Ahmad, A.
In CCS'08. Proceedings of the 15th ACM Conference on Computer and Communications Security, Alexandria, Virginia, USA, October 27-31, 2008
Syverson, P., Jha, S. and Zhang, X. (eds.)
pp 543-554
ACM, 2008

Usability of CAPTCHAs or usability issues in CAPTCHA design
Yan, J. and Salah El Ahmad, A.
In SOUPS 2008. Proceedings of the Fourth Symposium on Usable Privacy and Security, Pittsburgh, PA, USA, July 23-25, 2008
ACM International Conference Proceedings, 145, pp 44-52
ACM, 2008

Do background images improve "draw a secret" graphical passwords ?
Dunphy, P. and Yan, J.
In CCS'07. Proceedings of the 14th ACM Conference on Computer and Communications Security, Alexandria, Virginia, USA, October 29-November 2, 2007
De Capitani di Vimercati, S., Syverson, P. and Evans, D. (eds.)
pp 36-47
ACM, 2007

[Abstract]

Breaking Visual CAPTCHAs with Naive Pattern Recognition Algorithms
Yan, J. and Salah El Ahmad, A.
In Proceedings. Twenty-Third Annual Computer Security Applications Conference, ACSAC 2007, 10-14 December 2007, Miami Beach, Florida
pp 279-291
IEEE, 2007

Graphical Passwords & Qualitative Spatial Relations
Lin, D., Dunphy, P. ,Olivier, P. and Yan, J.
In SOUPS 2007. Third Symposium on Usable Privacy and Security, Pittsburgh, PA, July 18-20, 2007
ACM International Conference Proceedings, 229, pp 161-162
ACM Press, 2007
Notes : Poster Session

[Abstract]

Is FacePIN Secure and Usable?
Dunphy, P. and Yan, J.
In SOUPS 2007. Third Symposium on Usable Privacy and Security, Pittsburgh, PA, July 18-20, 2007
ACM International Conference Proceedings, 229, pp 165 - 166
ACM Press, 2007
Notes : Poster Session

[Abstract]

Enhancing Collaborative Spam Detection with Bloom Filters
Yan, J. and Cho, P. L.
In Proceedings of 22nd Annual Computer Security Applications Conference, 11-15 December 2006, Miami Beach, Florida, USA
pp 414-428
IEEE Computer Society, 2006

A Systematic Classification of Cheating in Online Games
Yan, J. and Randell, B.
In 4th ACM SIGCOMM Workshop on Network and System Support for Games (NetGames05), Hawthorne, NY, October 10-11, 2005
pp 1-9
ACM Press, 2005
Notes : Session: cheating and fairness. pp.1-9

Security Design in Online Games
Yan, J.
In 19th Annual Computer Security Applications Conference (ACSAC’03), Las Vegas, U.S.A., 8-12 December, 2003
pp 286-297
IEEE Computer Society Press, 2003

Denial of Service: Another Example
Yan, J.
In Security in the Information Society : Visions and Perspectives. IFIP TC11 17th International Conference on Information Security (IFIP/SEC2002), May 7-9, 2002, Cairo, Egypt
Ghonaimy, M., El-Hadidi, M.T. and Aslan, H.K. (eds.)
IFIP Conference Proceedings, 86, pp 161-170
Kluwer Academic Publishers, 2002

A Note on Proactive Password Checking
Yan, J.J.
In New Security Paradigms Workshop 2001, September 10th-13th, Cloudcroft, NM, USA
pp 127-135
ACM, 2001

The XenoService -- A Distributed Defeat for Distributed Denial of Service
Yan, J., Early, S. and Anderson, R.
In Third Information Survivability Workshop (ISW-2000), Boston, MA, October 24-26 2000
pp 195-200
IEEE, 2000

CS-TR N^o 1127 Is cheap labour behind the scene? - Low-cost automated attacks on Yahoo CAPTCHAs
Yan, J., Salah El Ahmad, A.
School of Computing Science, Newcastle University, Nov 2008

CS-TR N^o 1093 A Low-cost Attack on a Microsoft CAPTCHA
Yan, J., Salah El Ahmad, A.
School of Computing Science, Newcastle University, Apr 2008

[Abstract]

CS-TR N^o 1026 Breaking Visual CAPTCHAs with Naïve Pattern Recognition Algorithms
Yan, J., Salah El Ahmad, A.
School of Computing Science, Newcastle University, May 2007

[Abstract]

CS-TR N^o 973 Enhancing Signature-based Collaborative Spam Detection with Bloom Filters
Yan, J., Cho, P. L.
School of Computing Science, Newcastle University, Jun 2006

[Abstract]

CS-TR N^o 970 Bot, Cyborg and Automated Turing Test
Yan, J.
School of Computing Science, Newcastle University, Jun 2006

[Abstract]

CS-TR N^o 889 Security in Computer Games: from Pong to Online Poker
Yan, J., Randell, B.
School of Computing Science, Newcastle University, Feb 2005

[Abstract]

An Attack on A Traitor Tracing Scheme
Yan, J. J. and Wu, Y.
UCAM-CL-TR-518, Computer Laboratory, University of Cambridge, July, 2001
Notes : Also appears as IACR Cryptology ePrint Archive Report 2001/067.