Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. The word steganography is of Greek origin and means "concealed writing" from the Greek words steganos meaning "covered or protected", and graphei meaning "writing".
After reading this complete detail it seems that it is more powerful than cryptography. The reason is that it offers a high level of security as compared to cryptography process.
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