ABSTRACT
Recently, there has been an increased interest in steganography (also called stego). We have seen this
technology mentioned during the investigation of the September 11 attacks, where the media reported
that the terrorists used it to hide their attack plans, maps, and activities in chat rooms, bulletin boards,
and Web sites. Steganography had been widely used long before these attacks and, as with many other
technologies, its use has increased due to the popularity of the Internet.
