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ISW
2004
Springer
10 years 2 months ago
Image Recognition CAPTCHAs
CAPTCHAs are tests that distinguish humans from software robots in an online environment [3, 14, 7]. We propose and implement three CAPTCHAs based on naming images, distinguishing ...
Monica Chew, J. D. Tygar
HIP
2005
Springer
174views Cryptology» more  HIP 2005»
10 years 3 months ago
Collaborative Filtering CAPTCHAs
Abstract. Current CAPTCHAs require users to solve objective questions such as text recognition or image recognition. We propose a class of CAPTCHAs based on collaborative ļ¬lterin...
Monica Chew, J. D. Tygar
ACSAC
2010
IEEE
9 years 7 months ago
Breaking e-banking CAPTCHAs
Many financial institutions have deployed CAPTCHAs to protect their services (e.g., e-banking) from automated attacks. In addition to CAPTCHAs for login, CAPTCHAs are also used to...
Shujun Li, S. Amier Haider Shah, M. Asad Usman Kha...
CVPR
2003
IEEE
10 years 11 months ago
Recognizing Objects in Adversarial Clutter: Breaking a Visual CAPTCHA
In this paper we explore object recognition in clutter. We test our object recognition techniques on Gimpy and EZGimpy, examples of visual CAPTCHAs. A CAPTCHA ("Completely Au...
Greg Mori, Jitendra Malik
WWW
2009
ACM
10 years 10 months ago
What's up CAPTCHA?: a CAPTCHA based on image orientation
We present a new CAPTCHA which is based on identifying an image's upright orientation. This task requires analysis of the often complex contents of an image, a task which hum...
Rich Gossweiler, Maryam Kamvar, Shumeet Baluja
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