Analysis of security threats in wireless sensor network

International Journal of Wireless & Mobile Networks (IJWMN) Vol. 6, No. 2, April 2014
DOI : 10.5121/ijwmn.2014.6204 35
ANALYSIS OF SECURITY THREATS IN
WIRELESS SENSOR NETWORK
Sahabul Alam `
and Debashis De
Department of Computer Science and Engineering,West Bengal University of
Technology, Kolkata,India
ABSTRACT
Wireless Sensor Network(WSN) is an emerging technology and explored field of researchers worldwide
in the past few years, so does the need for effective security mechanisms. The sensing technology
combined with processing power and wireless communication makes it lucrative for being exploited in
abundance in future. The inclusion of wireless communication technology also incurs various types of
security threats due to unattended installation of sensor nodes as sensor networks may interact with
sensitive data and /or operate in hostile unattended environments. These security concerns be addressed
from the beginning of the system design. The intent of this paper is to investigate the security related
issues in wireless sensor networks. In this paper we have explored general security threats in wireless
sensor network with extensive study.
KEYWORDS
Wireless Sensor Networks,Security,Threats,Attacks
1. INTRODUCTION
Wireless sensor networks are network of thousand of sensor nodes. Sensor nodes are small in size,
less memory space, cheaper in price with restricted energy source and limited processing
capability. WSNs are rapidly gaining popularity due to low cost solutions to a variety of real
world challenges [1].The basic idea of sensor network is to disperse tiny sensing devices, which
are capable of sensing some changes of incidents / parameters and communicating with other
devices over a specific geographic area for some specific purposes like surveillance,
environmental monitoring, target tracking etc. Sensor can monitor pressure,humidity, temperature,
vehicular movement, lightning conditions, mechanical stress levels on attached objects and other
properties [2].Due to the lack of data storage and power sensor networks introduce severe
resource constraints. These are the obstacles to the implementation of traditional computer
security techniques in a WSN. Security defenses harder in WSN due to the unreliable
communication channel and unattended operation. As a result these networks require some
unique security policies.Cryptography,steganography and other basics of network security and
their applicability can be used to address the critical security issues in WSN. Many researchers
have begun to address of maximizing the processing capabilities and energy saving of sensor
nodes with securing them against attackers.There are different types of attacks designed to exploit
the unreliable communication channels and unattended operation of WSNs. Physical attacks to
sensors play an important role in the operation of WSNs due to the inherent unattended feature.
We explore various types of attacks and threats against WSN.

36
2. FUNDAMENTAL SECURITY SCHEMES IN WIRELESS SENSOR
NETWORK
Security encompasses the characteristics of authentication, privacy,integrity,anti-playback and
nonrepudiation. The more the risk of secure transmission of information over the network has
increased as the more dependency on the information provided by the networks has been
increased.Several cryptographic, steganographic and other techniques are used which are well
known for the secure transmission of various types of information over networks [3].In this
section, we discuss the network security basic and how the techniques are meant for wireless
sensor networks.
2.1 Cryptography
The encryption-decryption techniques devised for the traditional wired networks are not feasible
to be applied directly for wireless sensor networks. WSNs consist of tiny sensors which really
suffer from the lack of battery power,processing and memory. Any encryption scheme applying
on WSNs require transmission of extra bits,hence extra processing,memory and battery power
which are very important resources for the sensor’s longevity. Applying the security
mechanisms such as encryption could also increase delay, jitter and packet loss in wireless sensor
networks [3]. There are some key questions arise when applying encryption schemes to WSNs
like, how the keys are generated or disseminated. There is an important issue how the keys could
be modified time to time for encryption as there is minimal (or no) interaction for the sensors.
There are other many issues how keys are revoked, assigned to a new sensor added to the
network or renewed for ensuring robust security for the network. There could not be an efficient
solution for adopting of pre-loaded keys or embedded keys.
2.2 Steganography
Steganography aims at hiding the existence of the message while cryptography aims at hiding the
content of a message. In steganography a message embeds into the multimedia
data(image,sound,video etc.).Steganography modifies the carrier in a way that is not perceptible
and looks just like ordinary. It is very useful when we want to distribute secret data publicly and
in the case that we want to send a secret data without sender information as it hides the existence
of the covert channel. Securing wireless sensor networks is not directly related to steganography
and processing multimedia data (like audio,video). With the inadequate resources of the sensors
for securing wireless sensor networks is difficult and an open research issue.
2.3 Physical Layer Secure Access
Frequency hopping provides physical layer secure access in WSN. A dynamic combination of the
parameters like hopping set(available frequencies for hopping), hopping pattern (the sequence in
which the frequencies from the available hopping set is used) and dwell time(time interval per
hop) could be used with a little expense of memory, processing and energy resources. In physical
layer secure access the efficient design is required so that the hopping sequence is modified in
less time than to discover it and for employing this both the sender and receiver should maintain a
synchronized clock. A scheme as proposed in [4] could also be utilized which introduces secure
physical layer employing the singular vectors with the channel synthesized modulation.

37
3. THREAT MODEL
It is usually assumed that an attacker may know the security mechanisms that are deployed in a
sensor network. Attackers may be able to compromise a node or even physically capture a node.
Most WSN nodes are viewed as non-tamper resistant due to the high cost of deploying tamper-
resistant sensor nodes. The attacker is capable of stealing the key materials contained within the
compromised node. Base stations are regarded as trustworthy in WSNs. Most researchers focus
on secure routing between sensors and the between base stations.
Attacks in sensor networks can be classified into the following categories
1. Outsider Vs. insider attacks: Outsider attacks are attacks from nodes which do not belong to a
WSN. Insider attacks occur when legitimate nodes of a WSN behave in unintended or
unauthorized ways.
2. Passive Vs. active attacks: Passive attacks include eavesdropping on or monitoring packets
exchanged with in a WSN. Active attacks involve some modifications of the data stream or the
creation of a false stream.
3. Mote-class Vs. Laptop-class attacks: An adversary attacks a WSN by using a few nodes with
similar capabilities to the network nodes in mote-class attacks. Mote class attackers can jam the
radio link in it’s immediate vicinity. In laptop class attacks an adversary can use more powerful
devices (e.g a laptop) to attack a WSN. These devices have greater transmission range, energy
reserves and processing power than the network nodes. A laptop class attacker might be able to
eavesdrop on an entire network.
4. THREAT ATTACKS IN WIRELESS SENSOR NETWORK
Why is security necessary in WSN? Due to the broadcast nature of the transmission medium
wireless sensor networks are vulnerable. There are another reason of vulnerability of WSNs are
nodes are often placed in a hostile or dangerous environment and they are not physically safe.
Most of the threats and attacks against security in wireless sensor networks are almost similar to
their wired counterparts while some are exacerbated with the inclusion of wireless connectivity.
WSNs are usually more vulnerable to various security threats because the unguided transmission
medium is more susceptible to security attacks, but also through traffic analysis, privacy violation,
physical attacks and so on.
Attacks on WSNs can be classified from two different levels of views
1. Attack against security mechanisms
2. Attack against basic mechanisms (like routing mechanisms)
In many applications the data obtained by the sensing nodes need to be authentic [5]. A false or
malicious node could intercept private information in the absence of proper security or could send
false messages to nodes in the network. Different possible attacks can be categorized as follows
4.1. Denial of Service Attacks
In WSN, Denial of Service (DOS) is produced by the unintentional failure of nodes or malicious
action. In DOS attack the adversary attempts to subvert, disrupt or destroy a network. DOS attack
diminishes a network capability to provide a service for any event. The simplest DOS attack tries
to exhaust the resources available to the victim node, by sending extra unnecessary packets and

38
thus prevents legitimate network users from accessing services or resources to which they are
entitled [6].
4.1.1 Jamming
Jamming is a DOS attack at physical layer. Jamming interferes with the radio frequencies that a
network’s nodes are using [7]. A jamming source may either be powerful enough to disrupt the
entire network or less powerful and only able to disrupt a smaller portion of the network. It
creates radio interference and resource exhaustion.To defend against jamming involve variations
of spread-spectrum communication such as frequency hopping and code spreading.Security class
of this attack is modification.
4.1.2 Tampering
Another DOS attack in physical layer is tampering. By physical access an attacker can extract
sensitive information such as cryptographic keys or other data on the node. A compromised node
creates, which the attacker controls by altering or replacing node. Vulnerability of this attack is
logical.One defence to this attack involves tamper-proofing the node’s physical package.
4.1.3 Collisions
Collision is a DOS attack in the data link layer. When two nodes attempt to transmit on the same
frequency simultaneously a collision occurs. A change will likely to occur in the data portion
when packets collide and causing a checksum mismatch at the receiving end. The packet will then
be discarded as invalid. An adversary may strategically cause collisions in specific packets such
as ACK control messages. Error-correcting codes use to defend against collisions.
4.1.4 Exhaustion
It is another type of DOS attack in link layer. An attacker can use repeated collisions to cause
resource exhaustion. For example, a native link-layer implementation may continuously attempt
to retransmit the corrupted packets. The energy reserves of the transmitting node unless these
hopeless retransmissions are discovered or prevented. Applying rate limits to the MAC admission
control is a possible solution of exhaustion.
4.1.5 Unfairness
Unfairness is a weak of a DOS attack in link layer. An attacker, may cause unfairness in a
network by using the above link- layer attacks. Instead of preventing access to a service outright,
an attacker can degrade it in order to gain advantage such as causing other nodes in a real time
MAC protocol to miss their transmission deadline.
4.1.6 Flooding
Flooding is a DOS attack in transport layer. A protocol becomes vulnerable to memory
exhaustion through flooding when it maintains at either end of a connection. An attacker may
repeatedly make new connection requests until the resources required by each connection are
exhausted or reach a maximum limit. In either case, further legitimate requests will be ignored.
Disrupt communication is one of purpose of this attack. It creates resource exhaustion and
reduces availability.

39
4.1.7 Desynchronization
Disruption of an existing connection is desynchronization. For example, an attacker may
repeatedly spoof messages to an end host, causing that host to request the retransmission of
missed frames. With proper timing, an attacker may degrade or even prevent the ability of the end
hosts to successfully exchange data. A possible solution to this type of attack is to require
authentication of all packets communicated between hosts. The authentication method would be
secure as an attacker will be unable to send the spoofed messages to the end hosts.Vulnerability
of this attack is logical.
4.1.8 Data Integrity Attack
Data integrity attacks are caused by changing the data contained within the packets or injecting
false node while the data travelling among the nodes in WSN. The attacker node must have more
processing, memory and energy than the sensor nodes. The goals of this attack are to falsify
routing data in order to disrupt the sensor network’s normal operation and also falsifies sensor
data by doing so compromise the victim’s research. Digital signatures and asymmetric key
systems are used to defend against this attack. This requires a lot of additional overhead and is
difficult to adapt in WSN.
4.2 The Sybil Attack
The sensors in a WSN might need to work together to accomplish a task in many cases, hence
they can use distribution of subtasks and redundancy of information. In such case a single node
duplicates itself and presented in the multiple locations. The Sybil attack targets fault tolerant
schemes such as multipath routing, distribute storage and topology maintenance. Sybil attack tries
to degrade the integrity of data security and resource utilization that the distributed algorithm
attempts to achieve. Any peer to peer network especially wireless adhoc network is vulnerable to
sybil attack. Encryption and authentication techniques can prevent an outsider to launch a sybil
attack on the sensor network. If a compromised node pretends to be two of the three nodes the
algorithms used may conclude that redundancy has been achieved while in reality it has not.
Public key cryptography can prevent an insider attack but it is too expensive to be used in the
resource constrained sensor network. Figure 1 shows sybil attack.
Figure 1. Sybil Attack
4.3 Blackhole Attack
A malicious node acts as a blackhole[8] in the range of the sink attracts the entire traffic to be
routed through it by advertising itself as the shortest route. The adversary drops packets coming
from specific sources in the network. Once the malicious device is in between the communicating
nodes (for example, sink and sensor node), it is able to do anything with the packets passing
between them. This attack can also affect the nodes those are considerably far from the base
stations. It creates high rate of packet loss,network partition.It decreases the throughput of a

40
subset of nodes.The network architecture of this attack is traditional wireless sensor network.
Figure 2 shows the conceptual view of a blackhole attack.
Figure 2. Blackhole Attack
4.4 HELLO Flood Attack
HELLO Flood is a novel attack against sensor networks. It is introduced in [9].This attack uses
HELLO packets as a weapon to convince the sensors in WSN. Many protocols require nodes to
broadcast HELLO packets to announce themselves to their neighbours and a receiving node may
assume that it is within normal radio range of the sender. This assumption may be false because a
laptop class attacker broadcasts routing or other information with large enough transmission
power could convince every node in the network that the adversary is it’s neighbour. For example,
an adversary advertises a very high quality route to the base station to every node in the network
could cause a large number of nodes to attempt to use this route, but those nodes sufficiently far
away from the adversary would be sending packets into oblivion. The network is left in a state of
confusion.This attack wastes node’s energy due to laptop class attacker and creates routing delay.
The network architecture of this attack is traditional wireless sensor network.
4.5 Traffic Analysis Attack
WSNs consist of many low-power sensors communicating with a few powerful and robust base
stations. Data gathered by the individual nodes routed to the base station. Often, for an adversary
to effectively render the network useless, the attacker can simply disable the base station. Even
when encrypted messages are transferred, it still leaves a high possibility analysis of the
communication patterns. Sensor activities can potentially reveal enough information to enable an
adversary to cause malicious harm to the sensor network. Table 1shows layer based attacks and
possible security mechanisms in wireless sensor networks.
Layer Attacks Security Approach Defenses
Physical layer Jamming
Lower duty cycle, Priority
messages, Spread-spectrum
techniques
Tampering Tamper proofing, Hiding
Data Link layer
Collision Error-correcting code
Exhaustion Rate limitation

41
Unfairness Small frames
Network layer
Spoofed, altered or replayed
routing information
Authentication, Monitoring
Selective forwarding Probing, Redundancy
Sink hole Monitoring, Redundancy,
Authentication
Sybil Probing, Authentication
Worm holes Authentication, Packet
leashes by using geographic
and temporal information
Hello flood Verify the bidirectional link,
Authentication
Acknowledgment spoofing Authentication
Transport layer
Flooding Client puzzles
Desynchronization Authentication
Application layer
Attacks on reliability and
Clone attack:
Clock skewing, Selective
message forwarding, Data
aggregation distortion
Unique pair wise keys and
cryptographic approach.
Authentication can be used
to protect any data integrity
Encryption is an effective
approach for data
confidentiality protection
Table 1. Layer based attacks and possible security mechanisms in wireless sensor network
4.6 Node Replication Attack
It is quite simple attack. An attacker copies the node ID of an existing sensor node and adds to an
existing sensor network. With node replication approach a sensor network’s performance can
severely disrupt. Packets can be corrupted or even misrouted. As a result this can form a
disconnect network, false sensor reading etc. An attacker can copy cryptographic keys to the
replicated sensors by physical accessing to the entire network. The attacker could easily
manipulate a specific segment of the network by inserting the replicated nodes at specific network
points, perhaps by disconnecting it altogether.
4.7 Attacks Against Privacy
Sensor network technology provides automatic data collection capabilities through efficient
deployment of tiny sensor devices. These technology exhibits significant potential for abuse. As
sensor network provides increased data collection capabilities, so privacy problems arise. The

42
main privacy problem is not that sensor network enable the collection of information. Direct site
surveillance uses to collect much information from sensor networks. Sensor networks suffer
privacy problems because they make large volume of information easily available through remote
access. Adversaries can gather information at low-risk in anonymous manner because they need
not be physically present to maintain surveillance.
4.8 Physical Attacks
Sensors networks typically operate in hostile outdoor environments. The sensor networks are
highly susceptible to physical attacks, i.e. threats due to physical node destructions as sensors are
small in size, deployed with the unattended environment. Physical attack destroys sensors
permanently, so there are looses of cryptographic secrets, tamper with the associated circuitry,
modify or replace sensors with malicious sensors under control of the attacker.
4.9 Wormhole Attack
Wormhole attack is a significant attack in WSN. This attack occurs at the initial phase when the
sensors start to discover the neighbouring information [10].In this attack there is no need
compromising a sensor in the network. In wormhole attack, the attacker records the packets (or
bits) at one location in the network and tunnels those to another location. The tunnelling or
retransmitting of bits could be done selectively. The simplest case of this attack is to have a
malicious node forwarding data between two legitimate nodes. Wormholes convince distance
nodes that they are neighbours, leading to quick exhaustion of their energy resources. An
adversary situated close to a base station may be able to disrupt routing by creating a well-placed
wormhole.
4.10 Spoofed, Altered or Replayed Routing Information
This is the most common direct attack against a routing protocol. This attack mainly targets the
routing information exchanged between the nodes. In order to disrupt traffic in the network, an
attacker may spoof, alter or reply routing information. These disruptions include the creation of
routing loops, extending and shortening source routes, attracting or repelling network traffic from
select nodes, partitioning the network, generating fake error messages and increasing end-to-end
latency. Authentication is the standard solution for these attack i.e routers will only accept routing
information from valid routers.
4.11 Selective Forwarding Attack
Multi-hop mode of communication is commonly preferred in WSN data gathering protocols. An
assumption made in multihop networks is that all nodes in the network will accurately forward
received messages. Selective forwarding attack is a situation when certain nodes do not forward
many of the messages they receive. In this attack, malicious nodes may refuse to forward certain
messages and simply drop them, ensuring that they are not propagated any further. When a
malicious node behaves like a black hole and refuses to forward every packet she sees is a simple
form of selective forwarding attack. This attack can be detected if packet sequence numbers are
checked properly and continuously in a conjunction free network. Data packet sequence number
in packet header can reduce this type attack. Vulnerability of this attack is logical.We have done
comparative analysis of different threats in wireless sensor networks in table 2.

43
Attacks Principle11
Disadvantage Network
architecture
Vulnerability14
Security
class15
Denial of
Service
(DoS)
attacks
All
Purposes
Eliminates
the
network’s
capacity
Traditional
wireless
sensor
network
Logical Interruption,
interception,
modification,
fabrication
Wormholes
Unfairness,
to be
authenticated,
to be
authorized
Difficult to
check
routing
information
Traditional
wireless
sensor
network
Logical Fabrication,
interception
Spoofed,
altered or
replayed
routing
information
Unfairness Generates
false
error
messages,
increase
end-to-end
latency,
extend or
shorten
source routes
Large,
distributed
and
traditional
wireless
sensor
network
modification
Link layer
Jamming
Disrupt
communication
Exhausting
node’s
resources,
confusion
and
packets
collision
Traditional
wireless
sensor
network
Logical Modification
Collision Unfairness Energy
exhaustion,
discarding
packets,
interefences,
cost effective
Large and
traditional
wireless
sensor
network
Resource
Exhaustion
Unfairness Compromise
availability,
Resource
exhaustion
Traditional
wireless
sensor
network
Unfairness Unfairness Node’s
hungry
to channel
access,
Efficiency
and utility of
service
decrease
Traditional
wireless
sensor
network

44
Acknowledge
spoofing
Unfairness False
information
to the
neighboring
nodes, packet
loss,selective
forwarding
attack
Traditional
and
distributed
wireless
sensor
network
modification
Sybil Unfairness,
To be
authenticated,
To be
authorized
Launch
threat
to
geographic
routing
protocol,
Expensive in
sensor
network
Traditional
wireless
sensor
network
Logical Modification,
Fabrication
Principle11
: Passive eavesdrop,disrupt communication, unfairness, to be authorized, to be
authenticated
Vulnerabilities14
: Physical (hardware) ,logical
Security class15
: Interruption, interception, modification, fabrication
Table 2. Comparative analysis of different threats in wireless sensor networks
4.12 Passive Information Gathering
With a powerful receiver and well designed antenna an intruder can easily pickoff the data stream.
An attacker locates the nodes and destroy them by interception of the messages containing the
physical location of sensor networks[11]. An adversary can observe the application specific
content of messages including message Ids, timestamps and other fields besides the location of
sensor nodes.
4.13 Node Capturing
A particular sensor might be captured. Node capturing may reveal it’s information including
disclosure of cryptographic keys and an adversary can get information from the captured node
[12].Node capturing compromises the whole sensor network and prevents from any
communication. It launches a variety of insider attacks, software vulnerabilities.
4.14 False or Malicious Node
Attacks against security in WSN are caused by the insertion of false information from
compromised nodes within the network [12].An intruder might add a malicious node to the
system that feeds false data or prevents the passage of true data. The most dangerous attack is
insertion of malicious node. Injecting malicious nodes destroy the whole network.

45
4.15 Energy Drain Attack
WSN is battery powered and dynamically organized. It is difficult or impossible to
replace/recharge sensor node batteries. Attackers may use compromised nodes to inject fabricated
reports into the network or generate large amount of traffic in the network as limited amount of
energy available in sensor node. Fabricated reports will cause false alarms that waste real world
response efforts and drain the finite amount of energy in a battery powered network. The network
architecture of this attack is traditional wireless sensor network. This attack is possible only if the
intruder’s node has enough energy to transmit packets at a constant rate. This attack destroys the
sensor nodes in the network, degrades performance of the network and ultimately splits the
network grid and by inserting a new sink node takes control of part of the sensor network.
Fabricated reports should be dropped en-route as early as possible to minimize the damage caused
by this attack.
4.16 Acknowledgement Spoofing
Mostly sensor network routing algorithms rely on implicit or explicit link layer
acknowledgements. An adversary can spoof link layer acknowledgments for ‘overhead’ packets
addressed to neighbouring nodes due to the inherent broadcast medium. Protocols that choose the
next hop based on reliability issues is susceptible packets being lost when travel along such links.
The goal includes convincing the sender that a weak link is strong or that a dead or disabled node
is alive. Acknowledgment spoofing attacks can be prevented by proper authentication for
communication and using good encryption techniques [13].
5. CONCLUSIONS
Most of the attacks in wireless sensor networks are caused by the insertion of false information.
For defending the inclusion of false reports by compromised nodes is required detecting
mechanism. Developing such detection mechanism is great research challenge. All of the
previously mentioned security threats i.e the HELLO flood attack, wormhole attack, sinkhole
attack, Sybil attack serves one common purpose that is to compromise the integrity of the network
they attack. In the past focus has not been on the security of WSNs. Security has become a major
issue for data confidentiality as the various threats are arising. In this paper we have tried to
present most of the security threats in WSN with extensive study.
6. REFERENCES
[1] I.F.Akyildiz, W.Su, Y.Sankarasubramaniam and E.Cayirci , A survey on sensor networks, IEEE
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[6] A.D.Wood and J.A.Stankovic,(2002)” Denial of Service in Sensor
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Authors
Sahabul Alam received B.E in Information Technology from Biju Patnaik University of
Technology, Rourkella, Orissa, India in 2005 and M.Tech in Computer Science and
Engineering from National Institute of Technology, Hamirpur, Himachal Pradesh,India
in 2010. His research interest is in wireless sensor network. He had been selected
Maulana Azad National Fellowship by University Grants Commission,New Delhi,India.
Dr. Debashis De is an associate professor in computer science and engineering
department , West Bengal University of Technology, Kolkata, India. He received P.hd
in nano technology engineering from Jadavpur University, India. He has published
many research papers at International reputed journals and conferences. He is an author
of different kinds of books. He received different kinds of awards from national and
international level. His research interest is in mobile computing and nano technology.

Analysis of security threats in wireless sensor network

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Analysis of security threats in wireless sensor network