Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macro- and micro-structure of trust networks   A challenging problem in the social sciences is the characterization of the
formation of ``social capital''. It is believed that societies with more social
capital are more democratic and economically developed than societies with
little social capital. However, social capital is a concept hard to quantify
and measure in a ``real-word'' context. Here, we take advantage of an existing
"web of trust'' between users of the "Pretty-Good-Privacy" (PGP) encryption
algorithm, which is used in digital communication to ``sign'' documents so that
the recipient knows for sure who the author is. Our analysis reveals the
coexistence in the web of trust of a macro scale-free structure with micro
strongly-connected cells in a complex network. We also show that when this
network is intentionally attacked the scale-free structure rapidly
disintegrates and that the resulting network is partitioned into a large number
of small strongly-connected cells that are resilient to the intentional attack.

7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin