Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: "On the Road" - Reflections on the Security of Vehicular Communication
  Systems   Vehicular communication (VC) systems have recently drawn the attention of
industry, authorities, and academia. A consensus on the need to secure VC
systems and protect the privacy of their users led to concerted efforts to
design security architectures. Interestingly, the results different project
contributed thus far bear extensive similarities in terms of objectives and
mechanisms. As a result, this appears to be an auspicious time for setting the
corner-stone of trustworthy VC systems. Nonetheless, there is a considerable
distance to cover till their deployment. This paper ponders on the road ahead.
First, it presents a distillation of the state of the art, covering the
perceived threat model, security requirements, and basic secure VC system
components. Then, it dissects predominant assumptions and design choices and
considers alternatives. Under the prism of what is necessary to render secure
VC systems practical, and given possible non-technical influences, the paper
attempts to chart the landscape towards the deployment of secure VC systems.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph