Steganography - Messages Hidden in Bits

Steganography is the process of hiding one medium of communication (text, sound or image) within another. This paper will discuss the tools used to both hide and unhide (know as Steganalysis) information. A look at the history starting with Herodotus in ancient Greece describing secret messages written in wax on stone tablets, to world war two’s secret double meaning Nazi messages and British Intelligences invisible ink. Most recently the techniques have been accredited with Osama Bin Laden's Al-Qa’eda terrorist network. Not all of Steganography involves some kind of subterfuge, I will also cover the area of digital watermarking, a method to try to protect the copyright of image.