Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Security Architecture for Railway Signalling   We present the proposed security architecture Deutsche Bahn plans to deploy
to protect its trackside safety-critical signalling system against
cyber-attacks. We first present the existing reference interlocking system that
is built using standard components. Next, we present a taxonomy to help model
the attack vectors relevant for the railway environment. Building upon this, we
present the proposed "compartmentalized" defence concept for securing the
upcoming signalling systems.

24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph