ACSAC
2010
IEEE
13 years 9 months ago
2010
IEEE
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...
CCS
2010
ACM
13 years 11 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...
AINA
2010
IEEE
14 years 4 months ago
2010
IEEE
— 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...
EUROSEC
2010
ACM
14 years 4 months ago
2010
ACM
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...
ICMCS
2006
IEEE
14 years 5 months ago
2006
IEEE
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 ...
ICCCN
2008
IEEE
14 years 5 months ago
2008
IEEE
—Effective defenses against DDoS attacks that deplete resources at the network and transport layers have been deployed commercially. Therefore, DDoS attacks increasingly use norm...
SAC
2010
ACM
14 years 6 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...