I'd like to introduce DM-Steg. It's a device mapper module that
provides deniable/steganographic encryption. DM-Steg provides similar
capabilities to Rubberhose (a now defunct project by Julian Assange et
al.) and more advanced deniable encryption than Truecrypt.
DM-Steg can be used to hide any number of strongly encrypted volumes
inside block devices or files. There is no way to determine how many
volumes a block device contains or even if the block device is not
random data. DM-Steg uses strong encryption yet still achives goood
performance - up to 148 MB/s on my core 2 duo, and only 1% slowdown on
DM-Steg is working code and free software, so if you have any interest
in deniable encryption, please head over to http://dmsteg.sf.net and
grab the tarball!
I've taken this project as far as I want so I'd very much like it if
there's anyone in the OSS community who wants to take it further.
Don't be shy! :)
All the best,