Steghide is a steganography program that is able to hide 
data in various kinds of image- and audio-files. The color- 
respectively sample-frequencies are not changed thus making the 
embedding resistant against first-order statistical tests.
Features:
  * compression of embedded data
  * encryption of embedded data
  * embedding of a checksum to verify the integrity of the extracted data
  * support for JPEG, BMP, WAV and AU files