Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Key Distribution Scheme for Sensor Networks Using Structured Graphs   This paper presents a new key predistribution scheme for sensor networks
based on structured graphs. Structured graphs are advantageous in that they can
be optimized to minimize the parameter of interest. The proposed approach
achieves a balance between the number of keys per node, path lengths, network
diameter and the complexity of routing algorithm.

29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg