Stegfs is a stegnographic (spelling?) filesystem, coming in the form of a kernel patch and some userspace tools. It is a very secretiv way of storing data on partitions. It combines information hiding and cryptography with the result that even the filesystem itself does not know if there *is* any data in the locked security levels.
The main author seems to have abandoned it. The last available patch is against 2.2.14, and some kernel interfaces changed since then. Some conceptional finetuning and additional features would be nice, too. I got it up and running and it works for me. It would be nice to have a debian package of this. The kernel is not my real expertise, and I think there are more capeable hands then mine for this. Is someone willing to take this and package it? This someone might also be the one takeing care of the stegfs itself in the long run.