3595 search results - page 2 / 719 » Image Recognition CAPTCHAs |
CCS
2010
ACM
13 years 5 months ago
2010
ACM
We systematically study the design of image recognition CAPTCHAs (IRCs) in this paper. We first review and examine all IRCs schemes known to us and evaluate each scheme against th...
WCRE
2008
IEEE
13 years 11 months ago
2008
IEEE
CAPTCHAs are automated Turing tests used to determine if the end-user is human and not an automated program. Users are asked to read and answer Visual CAPTCHAs, which often appear...
SICHERHEIT
2010
13 years 2 months ago
2010
A CAPTCHA is a program that generates challenges that are easy to solve for humans but difficult to solve for computers. The most common CAPTCHAs today are text-based ones where a ...
SAC
2010
ACM
13 years 12 months ago
2010
ACM
CAPTCHAs protect online resources and services from automated access. From an attacker’s point of view, they are typically perceived as an annoyance that prevents the mass creat...
CCS
2010
ACM
13 years 8 months ago
2010
ACM
In this paper, we propose a new form of image-based CAPTCHA we term "scene tagging". It tests the ability to recognize a relationship between multiple objects in an imag...