CAPTCHA is for Website’s Security
                     CAPTCHA is for Website’s Security
Owen Jones
Writer at Smart-living-tips.com, made
many article contributions to
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The main purpose for which the CAPTCHAs were invented was to 
stop spams from machines. To stop spams from machine CAPTCHA 
has to distinguish between a human and a computer or machine. 
Computer experts devised the method by utilising images of 
language. Images of language are randomly generated text and 
manipulated such that humans can read it but machines fail to 
identify them. Sometimes CAPTCHA offers to perform some task 
which are easier to perform by humans but almost impossible to 
perform by a machine. 
A human can easily read the text in image but a machine can only 
understand that it is an image file without identifying what this image 
is all about. CAPTCHAs also make use of an audio file so that 
dyslexic and visually impaired people can easily identify the 
CAPTCHA. Some CAPTCHAs ask to perform simple mathematical 
calculations like 7+3 = which are very common on blogs.
Protecting Fake Sign-up or Registrations
Company’s like Google, Yahoo and Microsoft offer free e-mail 
services to the public after signing up with them. A bot programme 
can sign up for thousands of users and thus register for that many e-
mail accounts and that also in a few minutes. CAPTCHAs can 
prevent such bot programmes to attack such websites which provide 
free services.
Stopping Spams on Blogs
Bot programs can publish fake comments to improve the search 
engine rankings of the websites. By using CAPTCHAs machines can 
be stopped from commenting and only humans can comment on a 
blog without signing up.
Warding off Spams From E-mails
Spammers can crawl the web and identify e-mail addresses of the 
users and spam them with bogus e-mails. CAPTCHA is a way out 
which can prohibit such machine spammers to see the e-mail address 
by offering them to solve the CAPTCHA.
Online Opinion Polls
With the coming of Web 2.0 the internet has become more interactive 
with people. Online polls are becoming more and more popular with 
penetration of internet across the world growing faster and faster. We 
need to ensure in an online poll that votes are coming from genuine 
humans and not from any bot programme. CAPTCHA can ensure 
effectiveness of such online polls.
Safeguarding From Dictionary Attacks
Earlier the accounts of the user used to be locked after a series of 
unsuccessful logins. This practice gave attacker an opportunity to 
lock the account at his will. Now you can offer the user to solve for a 
CAPTCHA in order to prevent computer or machine to scan through 
entire space of passwords. Thus CAPTCHA prevents dictionary 
attacks on passwords.
Keep Webpages Unavailable for the Search Engines
Sometimes the need is like that you don't want your webpage to be 
searched through a search engine bot. With the use of CAPTCHA 
you can prevent the webpage from the search engine bots.
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