Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding Modern Intrusion Detection Systems: A Survey   Intrusion detection systems (IDS) help detect unauthorized activities or
intrusions that may compromise the confidentiality, integrity or availability
of a resource. This paper presents a general overview of IDSs, the way they are
classified, and the different algorithms used to detect anomalous activities.
It attempts to compare the various methods of intrusion techniques. It also
describes the various approaches and the importance of IDSs in information
security.

17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn