The Internet plays an increasingly important role in people's lives, but it also brings security
problems. CAPTCHA, which stands for Completely Automated Public Turing Test to Tell …

Abstract CAPTCHA, Completely Automated Public Turing test to tell Computers and Humans
Apart, is widely used as a security mechanism to classify human and computer. This security …

Abstract CAPTCHA-Completely Automated Public Turing test to tell Computers and Humans
Apart-is a test with the aim to distinguish between malicious automatic software and real …

CAPTCHAs represent a vital technique for protecting the security of websites by
differentiating between humans and bots. There have been many successful attacks against …

With increasing Internet usage worldwide, the need to protect websites from attackers is
paramount. And, with so many people performing tasks such as shopping and banking …

Nowadays access of information on Internet has became the need of everyone. Internet
offers number of online services such as creating free email accounts, online polling …

Human Interactive Proof (HIP) is a challenge-response test to recognize automated software
tools (called Bots) while protecting online services and resources. Completely Automated …

CAPTCHA is a simple challenge-response tool to determine whether the user is a bot or
human. The user must answer required text, calculate questions, or choose some images …