Steganography Analysis : Steganography And Steganography

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1.1 Steganography and its introduction Steganography comes from the Greek word “Steganographia” (στεγανό-ς, γραφ-ειν) which means “covered writing”. It is the art and science of concealing a secret information within a cover media preventing unauthorized people to know that something is hidden in it, so that the message can only be detected by its intended recipient. Cryptography and Steganography are ways of secure data transfer over the Internet 1.1.1 Cryptography and Steganography Cryptography scrambles a message to conceal its contents; steganography hides the existence of a message. It is not sufficient to simply encrypt the message over network, as attackers would detect, and react to, the presence of enciphered communications. But when information hiding is used, even if an eavesdropper snoops the transmitted object, he cannot suspect the secret information in the communication since it is carried out in a concealed way. 1.1.2 Limitations of Cryptography over Steganography One of the main drawbacks of cryptography is that the outsider is always aware of the communication because of the incomprehensible nature of the text. Steganography overthrows this drawback by concealing information into an unsuspicious cover object. Steganography gained importance because the US and the British government, after the advent of 9/11, banned the use of cryptography and publishing sector wanted to hide copyright marks. Modern steganography is generally understood to deal
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