That is not a bad idea since it would be easy to write a message in DNA.
http://www.mg.co.za/articlepage.aspx...ticleid=134442
Here's where to get the info from
http://www.ornl.gov/sci/techresource...#nucleotideseq
Surely SETI or someone has tried - we would be looking for a prime number sequence in the junk dna or similar to start with which should not be hard to search for.
Taking C=0, G=1, A=2 and T=3 (all 24 possibilities have to be investigated)
Use 2-8 bases per number with reversal (check left right and right left), say we take 4 then we have
CCCA = 2
CCCT = 3
CCGG = 5
CCGT = 7 etc
We then just get out computer program to read the dna database and check for sequences like these.
There's prob more to it than that but I guess that would be the basics which is do able by anyone with a bit of patience and a pc.