Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Molecular Model for Communication through a Secrecy System   Codes have been used for centuries to convey secret information.To a
cryptanalyst, the interception of a code is only the first step in recovering a
secret message.Deoxyribonucleic acid (DNA) is a biological and molecular
code.Through the work of Marshall Nirenberg and others, DNA is now understood
to specify for amino acids in triplet codes of bases.The possibilty of DNA
encoding secret information in a natural language is explored, since a code is
expected to have a distinct mathematical solution.

3
The categories of this paper are: physics
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas