CAPTCHA Theory
- 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