Chapter 1

Introduction and Historical Background


This chapter introduces the term, data hiding. Hiding data in an honest-looking carrier is not something new—since ancient times humankind tried to find the best means to secure communications, and hiding it was always a commonly used method. Cryptography and steganography are two techniques commonly used to secure and safely transmit digital data. In cryptography we are trying to make our message scrambled and unread; in steganography we are trying to hide the existence of the message by concealing it inside another unsuspicious message. In this chapter, we'll list old techniques invented for encrypting data, like classical ciphers, a transposition cipher, and mechanical cipher machines ...

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