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Anti-Abuse
The end is nigh: generic solving of text-based captchas
WOOT 2014
Usability
Easy does it: more usable captchas
CHI 2014
Anti-Abuse
The Art of Breaking and Designing CAPTCHAS
RSA 2012
Anti-Abuse
How we broke the nucaptcha video scheme and what we propose to fix it
Feb 2012
Anti-Abuse
Text-based captcha strengths and weaknesses
CCS 2011
Anti-Abuse
The failure of noise-based non-continuous audio captchas
S&P 2011
Anti-Abuse
Five surprising captcha schemes
Mar 2011
Usability
How good are humans at solving captchas a large scale evaluation
S&P 2010
Anti-Abuse
Decaptcha breaking 75% of ebay audio captchas
WOOT 2009