CAPTCHA Theory
CAPTCHA.net
How lazy cryptographers do AI
By Luis von Ahn, Manuel Blum ,and John Langford
CAPTCHA:Using Hard AI Problems For Security
by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford
Mathematical Foundations for Understanding and Designing Conceptualizing Strategizing Control (CONSCS) Systems
by Manuel Blum (PI), Avrim Blum (Co-PI), Lenore Blum (Co-PI), Steven Rudich (Co-PI),
Research Assistants: Ryan Williams, Luis von Ahn
CAPTCHA tests
Verifying the Presence of Humans:Three New CAPTCHAs
by Neal R. Wagner
A 3D captcha
by Michael G. Kaplan
Accessibility
Proposal for an Accessible Captcha
Inaccessibility of Visually-Oriented Anti-Robot Tests
by Matt May
Dive Into Accessibility personas
by Mark Pilgrim
Breaking
Breaking a Visual CAPTCHA
by Greg Mori and Jitendra Malik
Using AI to beat CAPTCHA and post comment spam
by Casey Chestnut
Pretend We're Not a Turing Computer but a Human Antagonist
by Samuel HOCEVAR
http://www.theregister.co.uk/2008/04/14/msn_captcha_breaking/
DDoS Attacks
Using Graphic Turing Tests To Counter Automated DDoS Attacks Against Web Servers
by William G. Morein Angelos Stavrou y Debra L. Cook
Angelos D. Keromytis Vishal Misra Dan Rubensteiny
Botz-4-Sale: Surviving Organized DDoS Attacks That MimicFlash Crowds
by Srikanth Kandula Dina Katabi Matthias Jacob Arthur Berger
MOVE: An End-to-End Solution To Network Denial of Service
by Angelos Stavrou Angelos D. Keromytis Jason Nieh Vishal Misra Dan Rubenstein
Spam
Fighting Spam May Be Easier Than You Think
by Cynthia Dwork
Securing Business's Front Door -Password, Token, and Biometric Authentication
by Lawrence O'GormanAvaya