Home > General > All About CAPTCHA


February 13, 2010 Leave a comment Go to comments

We all have seen similar screens (as shown below) while registering a new account or submitting some comments on public site.


Well this is CAPTCHA. Its objective is to tell humans and computer apart. One of its main purpose is to act as a security in preventing spams. CAPTCHA was introduced way back in 1997 by Alta Vista and so it has a long history.

But there is always a challenge to keep CAPTCHA’s up to date. Hackers and Researchers are always coming up with several ways to break CAPTCHA’s. This has resulted in creation of more comlplicated CAPTCHA’s and these days, I have noticed that, they are becoming increasingly difficult for humans to interpret.

There are also other uses of CAPTCHA’s like digitizing books and playing games. For example tagging images (Google Image Labeler) and guessing you gender!!


Well the jury is out and CAPTCHA’s are here to stay. I know that sometimes it can be a pain to enter these words but at the same time we can also have a lot of fun with them!!

  1. Eswaran Narasimhan
    February 13, 2010 at 6:26 pm

    Sophisticated IMage processing software usually does the trick for regular english words such as ‘tame’ above. It is therefore the resort for users to use non-english strings ans varying font sizes and font family. along with psychedelic patterns.

  2. Gaurav Verma - SSB
    February 15, 2010 at 7:24 pm

    I am have agreed with your comment and i have used captcha advance version in our current development. New version of captcha provide us the facility of refreshing captcha value(if readabiltiy is less ) or to tell the meaning of word using as captch value.

    Now a days, many sites are using captcha utility to save their sites from professional hackers who are trying the breach the security of different sites.

  3. Vaibhav Palan
    February 16, 2010 at 9:04 pm

    …thanks for a good blog again…Can we expect next blog on TCS.com horror from you…

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