Steganography - A smart way to hide data

This document discusses steganography, which is a way to hide secret data inside other neutral data like images, audio files, or documents. It provides examples of steganography throughout history using different mediums like wax tablets, silk, and special inks. Modern digital techniques are also covered, explaining the use of encryption, steganography encoders and decoders, different types of stegosystems that can use keys or be pure systems, and comparing steganography to cryptography and digital signatures in terms of confidentiality, integrity and availability of communications.