Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Survey of Active Attacks on Wireless Sensor Networks and their
  Countermeasures   Lately, Wireless Sensor Networks (WSNs) have become an emerging technology
and can be utilized in some crucial circumstances like battlegrounds,
commercial applications, habitat observing, buildings, smart homes, traffic
surveillance and other different places. One of the foremost difficulties that
WSN faces nowadays is protection from serious attacks. While organizing the
sensor nodes in an abandoned environment makes network systems helpless against
an assortment of strong assaults, intrinsic memory and power restrictions of
sensor nodes make the traditional security arrangements impractical. The
sensing knowledge combined with the wireless communication and processing power
makes it lucrative for being abused. The wireless sensor network technology
also obtains a big variety of security intimidations. This paper describes four
basic security threats and many active attacks on WSN with their possible
countermeasures proposed by different research scholars.

11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph