CAPTCHA lightning talk outline

captcha-lightning-talk-outline

1. Intro
What is CAPTCHA? (its an acronym!)
What is the purpose/motivation? 
 - Present a problem/test that is very difficult for computers to solve but not for humans as a security measure.
 - Generally used whenever you want to prevent a bot from automatically completing a process (account registration, protecting    comment spam in blogs, preventing automatic downloading of content, etc.)

2. Overview of different iterations/versions
CAPTCHA: first uses began in 2003 
- warped text
reCAPTCHA: 2007
- Same purpose as CAPTCHA, also assists in the digitization of books by presenting images of words flagged as hard to read for optical character recognition (OCR) software.
- Google maps house number photos added in 2012
- Image selection added in 2014
no CAPTCHA reCAPTCHA: 2013
- no text or images, just a checkbox.
- relies on behavioral analysis of browser's interactions with the CAPTCHA.
invisible reCAPTCA: December 2016! all new! who knows!

3. How they can be broken
CAPTCHA Weaknesses: CAPTCHA farms, exploiting design flaws, machine learing.
text reCAPTCHA Weaknesses: Same issues as original CAPTCHA implementation.
image reCAPTCHA Weaknesses: Image annotation
noCAPTCHA reCAPTHA Weaknesses: By manipulating browser history, a bot can pick up enough cookies to appear to have "human" behavior.