CAPTCHA

Did you see images like the one below.

I think you might have seen while creating a new account in Gmail,yahoo or in any registration. All of us just see and fill in the box below but many of them dont know what it is. In this post i am gonna discuss about what is that image and why is it mandatory.

The image which i described above is called as CAPTCHA

What is CAPTCHA and why is it mandatory?

CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart". From the abbrevation you could get a overview of what captcha is. CAPTCHA is a type of challenge-response test to ensure that the response(here filling a registration form)is generated by a human and not by any bots. To avoid filling of registration forms by bots or a computer CAPTCHA is made mandatory.

How CAPTCHA can avoid bots

The challenge in breaking the CAPTCHA lies in real hard task of teaching a computer how to process information in a way similar to how humans think. It really hard to teach a bot or computer to process information as human does. In this way CAPTCHA can avoid bots

What is the Need to Create a Test that Can Tell Computers and Humans Apart?

For many the CAPTCHA may seem to be silly and annoying, but in fact it has the ability to protect systems from malicious attacks where people try to hack the system. Attackers can make use of automated softwares to generate a huge quantity of requests thereby causing a high load on the target server which would degrade the quality of service of a given system, whether due to abuse or resource expenditure. This can affect millions of legitimate users and their requests. CAPTCHAs can be deployed to protect systems that are vulnerable to email spam, such as the services from Gmail, Yahoo and Hotmail.

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