Zhu, B., Captcha
as Graphical Passwords-A New Security Primitive Based on Hard AI Problems, IEEE Transactions on Information Forensics and Security, Vol.9, No.6, 2014, pp.
For the original CAPTCHA
images consisting of warped and obscured text, the generation script was designed to create any number of testable images, and the level of obscuration was carefully matched to what was relatively easy for most humans while being nearly impossible for machines.
Solve Media's Type-In technology creates extremely effective branding opportunities to engage consumers through Captcha
, display, video, pre-roll and mobile formats.
Se titulo con honores en 2002 y para festejarlo invento el sistema de autenticacion Captcha
Silver: The Human Captcha
, Microsoft/ Starcom Mediavest (see Digital: Mobile winner on page 22).
These security considerations include restricted requests number from a particular IP address and presence of Captcha
codes in such pages ,
As an extension of the second type, the aim of this study is to propose a practical CAPTCHA
scheme for image annotation that can be applied even if a target attribute (for annotation) is not clearly separated into mutually exclusive categories.
" stands for "completely automated public Turing test to tell computers and humans apart." The tests were created in 2000 by researchers at Carnegie Mellon University and are solved by millions of Web users daily.
He wanted a program that could "go through the buying process (including writing out the captcha
) until the payment page".
They can be used to send email spam, launch distributed denial-of-service attacks, solve CAPTCHA
challenges on websites, perform online banking fraud or click fraud and many other activities.
Other chapters explore graphical passwords, SQL injection attack countermeasures, scrambled CAPTCHA
, collaborative enterprise security, electronic voting systems, and mobile codes for wireless sensor networks.
Breaking the captcha
?" I asked a friend when we caught up a week ago.