756 search results - page 2 / 152 » Leveraging the CAPTCHA Problem |
SIPS
2008
IEEE
14 years 1 months ago
2008
IEEE
In this paper, we present a bio-inspired unified model to improve the recognition accuracy of character recognition problems for CAPTCHA (Completely Automated Public Turing Test t...
CVPR
2012
IEEE
11 years 9 months ago
2012
IEEE
In this article, we focus on the problem of large-scale instance-level image retrieval. For efficiency reasons, it is common to represent an image by a fixed-length descriptor w...
ICNSC
2007
IEEE
14 years 1 months ago
2007
IEEE
— Today sending spams has turned to be a major problem in the Internet. It is so serious that more than 80% of the transferred emails are spams. As a result, various methods have...
AINA
2010
IEEE
13 years 12 months ago
2010
IEEE
—Text-based password schemes have inherent security and usability problems, leading to the development of graphical password schemes. However, most of these alternate schemes are...
SOUPS
2009
ACM
14 years 1 months ago
2009
ACM
The ASIRRA CAPTCHA [6], recently proposed at ACM CCS 2007, relies on the problem of distinguishing images of cats and dogs (a task that humans are very good at). The security of AS...