Of course it ain't actual encryption, only (high-payload)
steganography at best. Now, if you sneak a message into a living
critter (a pet ("the message is the medium"), or creating the ultimate
self-propagating chainletter, a pathogen), that would be an
interesting twist.
Interesting is that you can tag the message with a longish
pseudorandom base sequence, which allows you to fish for the fragment
(from digests) via a complementary sequence. Anyone not in posession
of that sequence would have to do a total sequencing.
Of course, using real steganography (camouflaging messages in DNA
(say, "(c) by God, Inc.") as genes or ballast as highly repetitive
sequences) is also an option.
David G. Koontz writes:
> http://www.sjmercury.com/svtech/news/breaking/merc/docs/013955.htm