Security Vulnerability and Counter Measures in Mobile Ad Hoc Networks

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 4 Issue 2, February 2020 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
@ IJTSRD | Unique Paper ID – IJTSRD30107 | Volume – 4 | Issue – 2 | January-February 2020 Page 721
Security Vulnerability and Counter
Measures in Mobile Ad-Hoc Networks
Nwabueze, C. A1; Usiade, R. E2
1Department of Electrical/Electronic Engineering,
Chukwuemeka Odumegwu Ojukwu University Uli Anambra State, Uli, Nigeria
2Department of Computer Engineering, Delta State Polytechnic, Otefe-Oghara, Delta, Nigeria
ABSTRACT
The rising concern for beneficial, easy design anddeployable,flexible,reliable,
cost effective and scalable wireless network has led to the evolution ofmobile
Ad-hoc networks (MANETs). This type of network in its own peculiarity is a
wireless, mobile, infrastructure-less network technology. It hasbeenfoundto
be very useful in military, commercial, personal, emergency related
applications but not without some security challenges.ThesecurityofMANET
is an important challenge to network engineers due to its unmonitored
deployment nature and inherent resource limitation. This paper presents a
study of some of these security issues that militate against ad hoc network
technology design, deployment and operation. Possible counter measures
required to overcome these challenges are also presented.
Keywords: MANET, Security, Attacks, Characteristics, Counter Measures
How to cite this paper: Nwabueze, C. A |
Usiade, R. E "Security Vulnerability and
Counter Measures in Mobile Ad-Hoc
Networks"Published
in International
Journal of Trend in
Scientific Research
and Development
(ijtsrd), ISSN: 2456-
6470, Volume-4 |
Issue-2, February
2020, pp.721-726, URL:
www.ijtsrd.com/papers/ijtsrd30107.pdf
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1. INTRODUCTION:
Recent advancement in the field of information technology
(IT) have given rise to many new applications. The wireless
network technology is a drivingforceinthisnewapplication.
This modern technology in IT advancement has been
possible, innovative and beneficial considering the growth
and acceptance of mobile wireless communication
technology in recent time. Mobile wireless network
technology can be classified into infrastructure and
infrastructure less wireless network. The infrastructure
wireless network is a network where the nodes
(communicating devices) are connected with the fixed
physical representation also known as Access Point (Helen
and Arivazhagan, 2014). Figure 1 shows infrastructure (a)
and infrastructure-less (b) networks.
(a) (b)
Figure1: Infrastructure and Infrastructure-less Wireless Networks.
The infrastructure-less wireless network is also known as a mobile Ad-hoc network. There are different descriptionsadopted
for this type of wireless network, however, the fundamental features remain the same.
According to Cason et al (1996), it is an autonomous system node connected with wireless link. Singh and Dhiman 2013,
describe mobile Ad-hoc network (MANET) as a complex distributed system that comprises of wireless mobile node that are
freely and dynamically self-organize into arbitrary and temporary network topologies.
IJTSRD30107

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
Nithya et al 2016, described a mobile Ad hoc network as a collection of wireless nodes that can dynamically be set up
anywhere, anytime without having the pre-existing network infrastructure. It is an autonomous collection of mobile devices
which forms a temporary network without the aid of centralized administration or standard support devices regularly
available in conventional networks. These different definitions of mobile Ad-hoc network outline some basic fundamental
features/characteristics that are associated with this technology.
Some are highlighted as follows:
Autonomous Behavior: In mobile Ad-hoc network, each mobile terminal is an autonomous node. It simply means that each
node in the network behaves both as host and router. Hence, besides is normal function as a node, it can also function as a
switching device (router).
Distributed Operation: The mobile Ad-hoc network do not have any central control operational mode. In other words, the
control and management of the network is distributed among the nodes. The nodes collaborate with each other to provide
efficient routing protocol and handle their peculiar security issues.
Multi-Hop Routing: Mobile Ad-hoc network employ the principles of single hop transmission for nodes within the network
transmission range. However, for transmission ofdata packetsoutside/beyondthetransmission range,the network makesuse
of multi-hop transmission. Data packet delivery from a source to its destination beyond transmission range is forwarded
through one or more intermediate nodes (Singh and Dhiman, 2013).
Dynamic Topology: The mobility featureofMANETmakesitimpossibletohavea consistenttopology.Theconfigurationofthe
node keeps changing due to the mobile nature of the node. This consequently leads to changes in the routing table of the
network.
Weak Link/Connectivity: Mobile Ad-hoc network makes use of wireless communication link. In this regard, the robustness,
reliability, efficiency of its wireless links are often weaker/inferior when compared with wired links. This limitation makes
them more prone to bit transmission error and security issues.
Similar Terminal Feature: All terminals in Mobile Ad-hoc network sometimes possess identical features with similar
responsibilities and capabilities.
Network Scalability: The ease for Mobile Ad-hoc network configuration creates room for its expansion and upgrade.Insome
applications (large environment sensor, fabrics, battlefield deployment, urban vehiclegrids)MobileAd-hocnetwork cangrow
to numerous thousand nodes (Kopekar and Kumar, 2015).
Terminal Energy Constraint: Mobile Ad-hoc network terminal devices have restrictions on the power source in order to
maintain portability, size and weight (Aarti and Tyagis, 2013). They also possess less CPU (central processingunit)processing
capability, smaller memory size. These limitations necessitate the need for algorithms which are energy efficient as well as
operating with limited processing and memory resources.
Limited Bandwidth: Wireless link are knowntohavesignificantlylowercapacitythaninfrastructurenetworks.In additionthe
efficiency of wireless communication medium have been found to be less when compared to wiredmediumduetotheeffectof
multiple access, fading, noise, interference conditions, etc.
2. Mobile Ad Hoc Network (MANET) Security Criteria
Some of the features of MANET make it susceptible to security related challenges. The criteria used to determine and evaluate
the security of MANET are as follows:
Authorization: This criterion assigns the different access right to different users (nodes) in the network.
Availability: The term Availability means that a node should maintain its abilitytoprovideall thedesignedservices regardless
of its security state (Mishra and Nadkarni, 2003). This criterion ensures that the node maintains its ability to provide all the
designed services irrespective of the network operational statusandthesecuritymeasuresadopted.It ensuresthesurvivability
of the network services despite denial of service attack.
Authentication: It ascertains the credibility of the network user.This ensuresthatparticipantsinthenetwork aregenuineand
they are not impersonators or imposters. Singh and Dhiman 2013, states that ifthereis nosuchauthenticationmechanism,the
attacker could act as a benign node and thus get access to confidential information or even insert some false messages to
disturb the normal network operations.
Uniqeness: This requirement ensures that malicious nodes do not resend previously captured data packets.
Confidentiality: Confidentiality means that certain information is only accessibletothosewhohave beenauthorizedtoaccess
it (Li and Joshi, 2008). It ensures vital information must be kept away from unauthorized users. According to Goyal etal,2011,
in order to maintain the confidentiality of some vital information, thereisneedtokeep themsecretfromall entitiesthatarenot
authorized and acknowledged to access them.

Integrity: Integrity guarantees the identity of the messages when they are transmitted. It ensures that data packets being
transferred without are not corrupt. It also asserts that data are modified byauthorizedpartiesorinauthorizedway(Aartiand
Tyagi, 2013).
Non-repudiation: It ensures the sender and receiver of the message cannot deny that they sent and received the massage
(Gary and Mahapatra, 2009).
3. Security Attacks on MANET and Counter Measures
The need to secure mobile Ad-hoc network operation is very important. The absence of centralized monitoring and
management system, absence of infrastructure, continuously changing (dynamic) topology and use of wireless transmission
medium makes the network vulnerable to physical, digital and cyber security attacks. Some of these attacks can be in term of
infiltration, eavesdropping, interference and so no. Security attack on MANET can be classified as either active attacks or
passive attack:
The passive attacks are forms of attack which are difficult to identity. They do not disrupt the operation of the network but
monitors its operation and violates the confidentialitycriteria ofthenetwork.Examplesincludeeavesdropping,trafficanalysis.
The active attacks cause serious effects on the network operations. They are attacks that bear some energy cost in order to
perform the attacks. In this form of attack, the intruder performs effective violation on either the network resources or data
transmitted or both. Example is denial of service attack.
The various forms of attack on MANET and some possible counter measures include the following:
Impersonation: It is a severe threat to MANET security. This form of attack allows the compromised node to join the
network and perform malicious behavior like propagate fake data packets, alter the transmission of good/normal data
packet. A good authentication measure can serve as an effective means for overcoming this form of attack.
Routing Table Corruption: In this type of attack, the malicious node generates fake routing table or alters the
configuration of the legitimate routing table or modify legitimate message from other nodes in order to add fake entire to
the routing table. This attack can have non-optial routers, bottlenecks and even cause partitioning of certain parts of the
network.
Denial of Service: DoS attacks are aimed to complete disruption of routing information. The attackers flood the network
with false routes and in addition disrupt the establishment of legal routes. Fellowship is a model based on obligation
proposed in the direction of alleviating the packet flooding and dropping of packet in the network. Limitation rate of
packets, restoration as well as enforcement are defined as the good constraints in this model (Balakrishnan et al, 2006).
Eavesdropping: It means to obtainsomeconfidential informationthatshouldbekeptsecretduringcommunication. These
information include public key, private key, location status, password of the nodes. TechniquesofFrequencyHoppingand
Spread Spectrum Communication can protect the nodes from eavesdropping by preventing radio interface as shown in
figure 2 (Hubaux et al, 2001).
Figure2. Eavesdropping Attack in MANET (Hubaux et al, 2001).
Snooping: This is unauthorized access to another person’s node and includes the use of software program to remotely
monitor activity on a terminal device. Good routing information can protect the network against this attack.
Location Disclosure: It is a form of attack that targets the privacy requirement of a mobile Ad-hoc network.
Wormhole: It involves cooperation of two malicious nodes. A node ‘X’ captures routing traffic at one point ofthenetwork
to node ‘Y’. Node ‘Y’ then injects the tunneled traffic back to the network. This type of attack is dangerous because it can
cause damage to the network without any knowledge of such damage. According to Li and Joshi (2008), the use of packet
leash is a general mechanism for detecting and, thus defending againstwormholeattacks.Aleashisanyinformation thatis

added to a packet designed to restrict the packet’s maximum allowed transmission distance. There are two main leashes,
which are geographical leashes and temporal leashes. A geographical leash ensures that the recipient of the packet is
within a certain distance from the sender. A temporal leash ensures that the packet has an upper bound on its lifetime,
which restricts the maximum travel distance, since the packet can travel at most at the speed-of-light.
A geographical leash in conjunction with a signature scheme (a signature providing non repudiation), can be used tocatchthe
attackers that pretend to reside at multiple locations (see figure 3).
Figure3: Wormhole Attack in MANET (Li and Joshi, 2008)
Black hole: In this attack, when a malicious node listen to a routerequestpacketinthe network,itrespondswiththeclaim
of having the shortest and the freshest route to the destination node even itf no such route exists. As a resultthemalicious
node easily misroute network traffic to it and then drop the packets transitory toitasdepictedinfigure4(Raja andBaboo,
2014). Khan and Islam (2012), presented a way to secure MANET against thisformofattack.Thiscanbeachieved byusing
encryption and node location information. However, key distribution is a challenge in MANET.
Figure4: Black hole Attack in MANET (Raja and Baboo, 2014).
Gray Hole Attack: It is a form of route misbehavior attack which leads to dropping of messages.
Malicious Code Attack: This is a type of virus attack which include; worms, spywares, Trojan horses which can attack
both operating system and use application at the network terminal. A reliable anti-virus and other utility software
applications can serve as good solution against these attacks.
Flooding Attack: In this type of attack, the attacker exhausts the network resources such as bandwidth, batterypoweror
disrupt the routing operation which causes degradation in network performance.
Traffic Monitoring and Analysis: This type of attack involves the use of software to monitor the directionandfrequency
of traffic flow. Network topology, node location, mode of operation of the node, source and destination of data packetsare
some of the information this form of attack can expose. Monika and Rahul (2010) proposed that traffic analysis can be
avoided by supporting link layer security and securing wireless MAC protocol.
Selfishness (Selfish Node Misbehavior): Uncooperative act of node but distinct for evil behavior is referredtoasselfish
misbehavior. Such evil node makes use of the network resources only for selfish benefit and reject or refuse to send data
packet from other nodes. They take unnecessary advantage of other nodes but do not allow their resources to be used.
TWOACK is a very efficient scheme. It identifies the uncooperative behavior of nodes and explores to mitigate the cause
through telling routing protocol (Kashyap et al, 2005).
Jamming: In this form of attack, the attacker transmits data packet at the same speed/frequency with same two
communicating nodes. This leads to conflict in the transmission link, between the two communicating parties. Regular
forms of data packet (signed) jamming are random noise and pulse.
Spread Spectrum Mechanism to block denial-of-service attacks could be a good solution.

Node Isolation Attack: In this attack, the communicating nodes are isolated by not spreading communication
link/medium to some particular collection of nodes or a node in the network. This keeps these set of nodes away from
others in the network hence routing is not possible to these nodes (Kannhavong et al, 2006).
This proposed counter measure is Intrusion Detection System (IDS), a local module of intrusion detection for OLSR. This
module does non-conformance evaluation of each node in network and reveals theexistenceofattack onroutingprotocol.
Rushing attack: In rushing attack, the compromised node receives a route request from the sourcenode,it quicklyfloods
the packet to other nodes in the network before the other node receive the some packet from the main source. This cause
the other nodes upon the acknowledgment of the packet from the legal source, they will discard/reject it (see figure 5).
Figure5: Rushing Attack in Ad Hoc Network (Li and Joshi, 2008)
This attack can be overcome via a set of generic mechanisms that together defend against the rushing attack. These include
Secure Neighbor Detection, Secure Route Delegation, and Randomized Route Request Forwarding (Li and Joshi, 2008). The
relations among these security mechanisms are shown in figure 6.
Figure6: Combined Mechanisms to Secure MANET against Rushing Attacks (Li and Joshi, 2008)
Malicious Code attack: This type of attack affects both
operating systems and user application. A very good
example include viruses, worms.
Session Hijacking: The attacker exploits the
unprotected session of its initial setup, spoofsthevictim
IP address, finds the correct sequence number and
lunches various DoS attacks.
CONCLUSION
The security challenges of MANET is a very serious concern
for both designers and operators. The reasons as clearly
explained include resources limitation, dynamic topology,
unmonitored deployment and lack of centralized
management of the network due to the nature and reason of
its configuration. This paper have contributed a lot in the
measure of identifying some of these forms of attack and in
addition proffer viable and resourceful counter measures
and solutions. This work will assist mobile Ad hoc network
designers and operators to take proactive measures to
safeguard these resources and put up better performance
during operations.
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