Steganography (`stealth') with GnuPG

[David Shaw]

On Sat, Jul 21, 2001 at 08:42:43PM -0400, David Shaw wrote:
> On Sun, Jul 22, 2001 at 01:28:07AM +0200, Frank Heckenbach wrote:
> > For PGP, there's a utility called `stealth' which strips off all
> > identifying header information to leave only the encrypted data in a
> > format suitable for steganographic use
> > (ftp://ftp.pgp.net/pub/pgp/utils/stealth/).
> > 
> > It doesn't seem to work with GnuPG encrypted files, however. Is
> > there a similar utility for GnuPG, or a way to make stealth work
> > with GnuPG?
> 
> Stealth only works with old-style pgp messages (pgp 2.6.x and
> friends).  It won't work with pgp 5 and up or openpgp (and hence gpg).
> It worked by stripping and juggling headers so that all that was left
> was raw encrypted bits which ideally would appear to be random.
> 
> You can probably use it with gpg if you generate pgp 2.6.x compatible
> messages (gpg --rfc1991 --cipher-algo idea --no-literal) using an old
> style v3 RSA key.

Er, make that "gpg --rfc1991 --cipher-algo idea --compress-algo 1".
Wrong cut-n-paste :)

David

-- 
   David Shaw  |  dshaw@jabberwocky.com  |  WWW http://www.jabberwocky.com/
+---------------------------------------------------------------------------+
   "There are two major products that come out of Berkeley: LSD and UNIX.
      We don't believe this to be a coincidence." - Jeremy S. Anderson