Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 28. Chapters: Alphanumeric code, Bacon's cipher, BPCS-Steganography, Canary trap, Covert channel, File camouflage, Invisible ink, Johannes Trithemius, Jpegx, Microdot, Microprinting, Mimic function, Null cipher, OpenPuff, Peter Wayner, Polybius square, Printer steganography, Steganalysis, Steganographic file system, Steganography tools, StegoShare.