Whenever we try to register with a website or comment on a blog. We are been asked to enter some crazy letters that have been all jumbled up. You know how frustrating it can sometimes. A question may arise here, what are those crazy letter and why do we have to type them in?
The full form of CAPTCHA is “Completely Automated
Public Turing test to tell Computers and Humans Apart”. This test assures that
the respondent is a human being not a computer generated machine. In simple
words, it is a word verification test usually used when we signup in any
website or blog. For example,
humans can read distorted text as the one shown below, but current computer
programs can't.
- The purpose of CAPTCHA,
The reason websites have CAPTCHA, is spam. Spam is the modern day equivalent of junk mail. That means when
you sign up for an E-mail account it has to be checked if the person
registering is a real live human being as opposed to a computer program
attempting to spam the site. CAPTCHA, may
be irritating and meaningless to many of us but actually it helps to protect
from different type of malicious attack. It is set up to protect the system
from spamming.
Ø Preventing Comment Spam in Blogs
Ø Preventing Dictionary Attacks.
Ø Protecting Website Registration.
Ø Worms and Spam.
- Why it is used?
Ø Preventing Comment Spam in Blogs
Ø Preventing Dictionary Attacks.
Ø Protecting Website Registration.
Ø Worms and Spam.
It is used in yahoo, hotmail, Gmail and other sites
for getting less spamming. Though hotmail always says less spam, but actually
no one is able protect spamming.AS there is always anti-security against
security. Otherwise NEWTON would be proved wrong as he said “For every action there is an equal and opposite reaction.” hahahaha…
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