stegnography (the art of hiding text or data behind image)

1) select a good image which you like the most

 

 2)  write the secret message  in notepad which we want to hide

 

3) Open cmd,  go to Start > All Programs >Accessories > Command Prompt.

4) In cmd type :
cd \
echo “your text to hide” >> “image.jpg”

 

 5 now  open the image with Notepad , here you can see the secret message at the end of image .



                 

Refer to know more:
http://en.wikipedia.org/wiki/Steganography