Good grief...this is REALLY old crap. Steganography is, was, and always will be a joke!! Why? Let's say an average pic file is 1 megabyte in size. Kinda large, but in the ball park. Add and audio or video file and it jumps to maybe 5 to15 megs. Dead give-away as very few pic files are 5 to 15 megs. in size. And simple detection tools are available to check and verify.
THIS is very serious file protection with in-depth documentation: http://www.jetico.com/data-protection-encryption-bestcrypt-enterprise/