The one problem that nobody has been able to fix, though, is that you can tell a stego encrypted container file by it's excessive size. There is next to zero picture deterioration, but your container file winds up the size of both files combined. If you come across suspicious pictures on any of these sites, check out the file size under properties. You might be able to identify a stego container, but then it is essentially impossible to get the hidden file out. The automatic stego programs now offer both password access to unlock the stego process and then high-level encryption on the hidden file before it is put into the container.
Look up "steganalysis" in a search engine, you get more recent info because it's the spanking brand new field of dealing with steganography.
Just for anyone interested, I've got some images... the first shows two original files. Below it you see the picture of the statue that has the pentagon image imbedded within it. You can't tell at all :-(
