Usability of CAPTCHAs Or usability issues in CAPTCHA design (2009)
CAPTCHA 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...
Enhancing Collaborative Spam Detection with Bloom Filters (2008)
Signature-based collaborative spam detection (SCSD) systems provide a promising solution addressing many problems facing statistical spam filters, the most widely adopted technology for detecting...
Cheating is rampant in current game play on the Internet. However, it is not as well understood as one might expect. In this paper, we summarize the various known methods of cheating, and we define a...
Breaking Visual CAPTCHAs with Naïve Pattern Recognition Algorithms (2008)
Jeff Yan, Ahmad Salah, El Ahmad
Visual CAPTCHAs have been widely used across the Internet to defend against undesirable or malicious bot programs. In this paper, we document how we have broken most such visual schemes provided at...
Added entries UNIVERSITY OF NEWCASTLE UPON TYNE (2006)
The Automated Turing test (ATT) is almost a standard security technique for addressing the threat of undesirable or malicious bot programs. In this paper, we motivate an interesting adversary model,...
Enhancing Signature-based Collaborative Spam Detection with Bloom Filters (2006)
J. Yan, P. L. Cho, Jeff Yan, Pook Leong Cho
Signature-based collaborative spam detection(SCSD) systems provide a promising solution addressing many problems facing statistical spam filters, the most widely adopted technology for detecting junk...
from Pong to Online Poker (2005)
Jeff Yan, Brian R, Newcastle Tyne
Abstract — Security can mean different things in a different application context. For decades, gaming has been a major computer application with its own distinct characteristics, and in fact,...
A Note on Proactive Password Checking (2001)
The paper is to address the following issues: 1) Although new password techniques have emerged, the use of proactive password checking is still a desirable method to improve systems security in the...