Everyday we come across “Captcha” forms where in you need to decipher a text or number and enter as text in a form to prove that you are a human user- which allows to stop spammy bots and automatic sign-ups.

Now, Carnegie Mellon University uses such service to actually digitize books. They scan books from the Internet Archive (a non-profit effort), and present those scanned fragments – two words at a time – as captcha to an user.

The user sees / hears it and type it as a textual words in the form (digitization). It solves two purposes – one you made a web registration to a web service and two you helped digitizing a book that will be available for public use (free).

The web service named as reCaptcha and it is a non-profit initiative, you can use this service as free for your own online security measures.

Now you can use it for your own email-id protection. Say for example, when publishing your email id on a blog or websites, you can make use of reCaptcha program.

Go to Mailhide page of reCapatcha, enter your full email-id and click “Protect”. (No sign-ups reqd).

You will be given an html code which can be used in your blog. It appears like this below.

pthi…@gmail.com

When users click on it, they have to identify the two words and then only, they will be shown your email-id in a new window.

Perfect, isn’t it?

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