Tamper-proof digital files

This video was presented as a demo to secondary school pupils as a motivation to pursue science fields. The video describes a special case of information hiding that is known as self-embedding. In essence, the process embeds a copy of the media into itself, of course it goes without saying that the copy has to be encrypted before the embedding takes place. The program is written purely in MATLAB with some scripts in PHP and HTML.

This file is also uploaded to youtube in case you wanna leave your comment over there.
http://www.youtube.com/watch?v=0K7ESpIFMbs&feature=channel_page