NP DNA espionage

[Doug Millison]

http://www.nytimes.com/library/national/science/062299sci-dna-steganography.html
"...researchers at Mount Sinai School of Medicine in New York have
developed a technique for conducting espionage on a molecular level, by
hiding a message in human DNA. Using the technique, a sender would create a
unique strand of DNA that only an intended recipient could isolate and
"read" from millions of similar strands.  .... The researchers used the
United States mail as a conduit for their message. They piped the DNA onto
a piece of filter paper with a tiny dot printed on it, cut out the dot
after it dried and taped it over the period in a sentence of a typewritten
letter that was then sent to the recipient. This use of a microdot makes
the technique doubly steganographic. "In the first case, we're hiding the
message," Dr. Bancroft said. "Then we're hiding the medium that contains
the message."  "