"In an in-depth analysis of a recently re-released videotape of Osama bin Laden’s August 2003 speech, Northeast Intelligence Network analysts found apparent alpha-numeric codes embedded in several frames of over 55,800 frames of the video tape analyzed. The code is not visible through normal viewing of the footage, and the viewer must know where in the lengthy footage to look for the coding sequence. The above frame illustrates a coding string found on one of the frames hidden in the footage. The video is significant itself as previously released bin Laden footage preceded the Madrid bombing attacks on 11 March 2004. Analysts have forwarded the footage, along with each isolated frame containing the coding, to law enforcement officials."
[Northeast Intelligence Network]
"Steganography is the art and science of hiding messages. Steganography is often combined with cryptography so that even if the message is discovered it cannot be read. The word steganography is derived from the Greek words "steganos" and "graphein", which mean "covered" and "writing." Steganography, therefore, is covered writing. Historical stenganography involved techniques such as disappearing ink or microdots. Modern steganography involves hiding data in computer files. It is fairly easy to hide a secret message in a graphic file without obviously altering the visible appearance of that file."
[Linux Security]
[Niels Provos and Peter Honeyman: "Detecting Steganographic Content on the Internet"—PDF]
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