Steganography

Something I learned this morning from an article in a science blog I subscribe to.

Steganography () is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form ofsecurity through obscurity. The word steganography is of Greek origin and means "concealed writing"...Steganography includes the concealment of information within computer files. In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. Media files are ideal for steganographic transmission because of their large size. --Wikipedia

The article is about information found on a flash drive of a captured Al Qaeda member. In a porno film were hidden dozens of training manuals, attack plans, and other material. In a porno film! Is there a thriller story in this material or what?