The completely automated public Turing test to tell computers and humans apart
(CAPTCHA) is among the most common methods of authentication used by websites and …

With data theft and computer break-ins becoming increasingly common, there is a great
need for secondary authentication to reduce automated attacks while posing a minimal …

A Completely Automated Public Turing test to tell Computers and Humans Apart
(CAPTCHA) is designed to distinguish humans from machines. Most of the existing tests …

CAPTCHA is a test that can tell humans and computer programs apart automatically. The
aim is to allow the server to identify the visitor is a human or a computer, and only provide …

CAPTCHA is one of the Turing tests used to classify human users and automated scripts.
Existing CAPTCHAs, especially text-based CAPTCHAs, are used in many applications …

CAPTCHA (Completely Automated Public Turing Test to tell Computers and Humans Apart)
have been a common tool for preventing unauthorized access to websites for over a decade …

Despite some technical and conceptual criticism on the CAPTCHA and its claimed
effectiveness, such human interaction proofs (HIPs) are still in the centre of attention. With …

With the cutting-edge improvement of web, online abuses have been increasing rapidly.
Phishing is the most widely recognized abuses performed by digital crooks nowadays. It is …

The increasing use of smartphones, tablets, and other mobile devices poses a significant
challenge in providing effective online security. CAPTCHAs, tests for distinguishing human …

The growth of online services has resulted in a great need for tools to secure systems from
would-be attackers without compromising the user experience. CAPTCHAs (Completely …