Nowadays, a great amount of information is circulated through the Internet. Some of them
exclusively belongs to a special group of users and requires protection and safeguarding …

E-commerce services are suffering abuse by programs (bots, spiders, etc.) masquerading as
legitimate human users. Efforts to defend against such attacks have, over the past several …

CAPTCHAs, a form of Human Interactive Proof (HIP), are means of enforcing security on
web systems. The resources of these web systems are misused by automatedbot'programs …

Nowadays, a great amount of information is circulated through the Internet. Some of them
exclusively belong to a special group of users and require protection and safeguarding …

Nowadays, many daily human activities such as education, commerce, talks, etc. are carried
out through the Internet. In cases such as the registering in Web sites, some hackers write …

Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA)
is a test, mostly used in web applications to verify that the user is human rather than an …

Captcha (Completely Automated public Turing test to tell Computers and Humans Apart)
system is used to verify whether a user is human or computer program. It's also known as …

A CAPTCHA is a test that a computer can automatically administer to determine if a user is a
human or a computer. Several aural and visual CAP'TCHAs have already been developed …

Usability Engineering is one of the key aspects of Human Computer Interaction designs.
Some of the characteristics of a usable system are learnability, rememberability, efficiency …

CAPTCHA stands for Completely Automated Public Turing Tests to Tell Computers and
Humans Apart. A CAPTCHA is a program that protects websites against bots-automated …