Steganography -- An Art of Protection of Text through Images
While casually surfing the Internet, I came across something called Steganography. First I got confused with Stenography. But carefully check the spelling. And there is some elegant explanation in Wikipedia to this here. In a way, I think this is similar to CAPTCHA project that is currently being used across all the web applications to prevent automated robots and spam spiders from creating havoc on the websites.
Something new that I learnt over the weekend and do a bit of research upon.