What is Steganography?
1) Steganography is the art and science of hiding messages. Steganography is often combined with cryptography so that even if the message is discovered it cannot be read.
2) The word steganography is derived from the Greek words "steganos" and "graphein", which mean "covered" and "writing." Steganography, therefore, is covered writing.
3) Historical stenganography involved techniques such as disappearing ink or microdots. Modern steganography involves hiding data in computer files.
4) It is fairly easy to hide a secret message in a graphic file without obviously altering the visible appearance of that file.
How to hide data inside images practically..??
1) Compress the file you want to secure (rar or zip), file.rar
2) Take the image file which you want to use, Eg. image.jpg
3) Now, run the following command:- copy /b image.jpg + file.rar output.jpg The copy commands copies the content of both the files into a third file
4) You will be able to see a new image named output.jpg
5) Double click hidden.jpg & you’ll see the original image
6) Open the file in archiving utility (winzip or winrar) It will open the content of original secure.zip
This trick was once used by Pakistani terrorists to communicate with their counterparts in India.
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