Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Architecture for Security and Privacy in Mobile Communications   There is much discussion and debate about how to improve the security and
privacy of mobile communication systems, both voice and data. Most proposals
attempt to provide incremental improvements to systems that are deployed today.
Indeed, only incremental improvements are possible, given the regulatory,
technological, economic, and historical structure of the telecommunications
system. In this paper, we conduct a ``thought experiment'' to redesign the
mobile communications system to provide a high level of security and privacy
for the users of the system. We discuss the important requirements and how a
different architecture might successfully satisfy them. In doing so, we hope to
illuminate the possibilities for secure and private systems, as well as explore
their real limits.

17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph