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ACSAC
2010
IEEE
8 years 5 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...
CCS
2010
ACM
8 years 7 months ago
Attacks and design of image recognition CAPTCHAs
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...
Bin B. Zhu, Jeff Yan, Qiujie Li, Chao Yang, Jia Li...
AINA
2010
IEEE
9 years 15 days ago
CAPTCHA Using Strangeness in Machine Translation
— CAPTCHA is a technique that is used to prevent automatic programs from being able to acquire free e-mail or online service accounts. However, as many researchers have already r...
Takumi Yamamoto, J. Doug Tygar, Masakatsu Nishigak...
EUROSEC
2010
ACM
9 years 21 days ago
The robustness of a new CAPTCHA
CAPTCHA is a standard security technology that presents tests to tell computers and humans apart. In this paper, we examine the security of a new CAPTCHA that was deployed until v...
Ahmad Salah El Ahmad, Jeff Yan, Lindsay Marshall
ICMCS
2006
IEEE
133views Multimedia» more  ICMCS 2006»
9 years 1 months ago
A Captcha Based on the Human Visual Systems Masking Characteristics
In this paper, a CAPTCHA is presented based on the masking characteristics of the Human Visual System (HVS). Knowing that noise can be masked by high activity regions and showing ...
Rony Ferzli, Rida A. Bazzi, Lina J. Karam
ICCCN
2008
IEEE
9 years 1 months ago
Sentinel: Hardware-Accelerated Mitigation of Bot-Based DDoS Attacks
—Effective defenses against DDoS attacks that deplete resources at the network and transport layers have been deployed commercially. Therefore, DDoS attacks increasingly use norm...
Peter Djalaliev, Muhammad Jamshed, Nicholas Farnan...
SAC
2010
ACM
9 years 2 months ago
CAPTCHA smuggling: hijacking web browsing sessions to create CAPTCHA farms
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...
Manuel Egele, Leyla Bilge, Engin Kirda, Christophe...
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