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