An analysis of security challenges in mobile ad hoc networks

Natarajan Meghanathan et al. (Eds) : WiMONe, NCS, SPM, CSEIT - 2014
pp. 13–25, 2014. © CS & IT-CSCP 2014 DOI : 10.5121/csit.2014.41202
AN ANALYSIS OF SECURITY CHALLENGES
IN MOBILE AD HOC NETWORKS
Ali Dorri and Seyed Reza Kamel and Esmail kheyrkhah
Department of Computer Engineering, Mashhad branch,
Islamic Azad University, Mashhad, Iran.
Alidorri@mshdiau.ac.ir
rezakamel@computer.org
e.kheirkhah@mshdiau.ac.ir
ABSTRACT
Mobile Ad Hoc Network (MANET) is a collection of wireless mobile nodes with restricted
transmission range and resources, no fixed infrastructure and quick and easy setup. Because of
special characteristics, wide-spread deployment of MANET faced lots of challenges like
security, routing and clustering. The security challenges arise due to MANETs self-
configuration and self-maintenance capabilities. In this paper, we present an elaborate view of
issues in MANET security. We discussed both security services and attacks in detail. Three
important parameters in MANET security are defined. Each attack has been analyses briefly
based on its own characteristics and behaviour. In addition, defeating approaches against
attacks have been evaluated in some important metrics. After analyses and evaluations, future
scopes of work have been presented.
KEYWORDS
Mobile Ad Hoc Network (MANET), Security, Attacks on MANET, Security services, Survey.
1. INTRODUCTION
In these years, progresses of wireless technology and increasing popularity of wireless devices,
made wireless networks so popular. Mobile Ad Hoc Network (MANET) is an infrastructure-
independent network with wireless mobile nodes. MANET is a kind of Ad Hoc networks with
special characteristics like open network boundary, dynamic topology, distributed network, fast
and quick implementation and hop by hop communications. These characteristics of MANET
made it popular, especially in military and disaster management applications. Besides providing
benefits, MANET features made it challengeable. Peer to peer applications [1], integration with
internet [2], security [3], maintaining network topology [4] and energy [5, 6] are some of the most
important challenges in MANET. We briefly discussed MANET challenges in our previous work
[7].
In MANET all nodes are free to join and leave the network, also called open network boundary.
All intermediate nodes between a source and destination take part in routing, also called hop by
hop communications. As communication media is wireless, each node will receive packets in its
wireless range, either it has been packets destination or not. These characteristics of MANET
increase its vulnerability against malicious behaviours. Therefore, security became the most
important challenge in MANET [8].

14 Computer Science & Information Technology (CS & IT)
In this paper our goal is to provide a comprehensive review on MANET security. Important
parameters in security are introduced. Security is divided in two aspects: security services and
attacks. A comprehensive review in both security aspects is presented. In addition, we analyses
each attack’s behaviour in different parameters. Defeating approaches are evaluated in important
metrics. Finally, future scopes of work are presented. Rest of this paper is organized as follow: in
section 2, three important security parameters in MANET are presented. Section 3 presents two
important aspects of security with a discussion on their strategies. Three combinational challenges
with security are presented in section 4. Section 5 presents our analyses and classifications on
security of MANET and presents some research interest in security. Section 6 introduces open
research issues and directions of researches in MANET security. Finally section 7 concludes the
paper and introduces best ways to secure MANET and presents some future works.
2. IMPORTANT PARAMETERS IN MANET SECURITY
Because of MANET’s special characteristics, there are some important metrics in MANET
security that are important in all security approaches; we call them “security parameters”. These
parameters defined due to MANET special characteristics. Being unaware of these parameters
may cause a security approach useless in MANET. Figure 1 shows the relation between security
parameters and security challenges. Each security approach must be aware of security parameters
as shown in Figure 1. All mechanisms proposed for security aspects, must be aware of these
parameters and don’t disregard them, otherwise they may be useless in MANET. Security
parameters in MANET are as follows:
Figure 1.Relation between Security Parameters and Security aspects
Network overhead: Each security mechanism uses a number of control packets. This parameter
refers to number of control packets generated by security mechanisms. As MANET uses wireless
communications, increasing network overhead may increase collision, congestion and packet loss
that may increase packet retransmission.
Processing time: This parameter refers to delay caused by security approach. Because of
MANET dynamic topology, neighbours of each node may change in a period of time. As a result,
previous information will not be efficient any more.
Energy consumption: Nodes have limited energy resources. One of the major issues is the
limited energy, which is usually supplied by node batteries that network nodes possess. Therefore
security approach must have low energy consumption.
Each security protocol must be aware of these three important parameters. In some situations a
trade-off between these parameters is provided in order to perform a satisfaction level in all of
them. Security protocols that disregard these parameters aren’t efficient as they waste network
resources.

Computer Science & Information Technology (CS & IT) 15
3. MANET SECURITY CHALLENGES
One of the earliest researches in security in MANET was presented in 2002 [9]. Some security
challenges in MANET were inherited from ad hoc networks that were research interests since
1999 [10, 11]. Generally there are two important aspects in security: Security services and
Attacks. Services refer to some protecting policies in order to make a secure network, while
attacks use network vulnerabilities to defeat a security service. In the next two parts, we will
discuss these two important aspects of MANET security.
3.1. Security Services
Security services are used to secure a network. Because of special features of MANET, providing
these services is a great challenge. For securing MANET a trade-off between these services must
be provided, which means if one service guarantees without noticing other services, security
system will fail. Providing a trade-off between these security services is depended on network
application, but the problem is to provide services one by one in MANET and presenting a way to
guarantee each service. We discuss five important security services and their challenges as
follows:
Availability: According to this service, each authorized node must have access to all data and
services in the network. Availability challenges arise due to MANETs dynamic topology and
open boundary. To provide this service, each authorized node must have access to data and
services when it needs them. Time spent for accessing is important as time is one of security
parameters. By using lots of security and authentication levels, this service is disregarded as
passing security levels needs time. Existing approaches for providing this service aren’t efficient
in MANET and by using them, high degree of distribution, autonomy and dynamicity of MANET
will be lost [12]. Authors in [12] provided a new way to solve this problem by using a new trust
based clustering approach. In the proposed approach which is called ABTMC (Availability Based
Trust Model of Clusters), by using availability based trust model, hostile nodes are identified
quickly and should be isolated from the network in a period of time, therefore availability of
MANET will be guaranteed.
Authentication: The goal of this service is to provide trustable communications between two
different nodes. When a node receives packets from a source, it must be sure about identity of the
source node. One way to provide this service is using certifications, whoever in absence of central
control unit, key distribution and key management are challengeable. In [13] the authors
presented a new way based on trust model and clustering to public the certificate keys. In this
case, the network is divided into some clusters and in this clusters public key distribution will be
safe by mechanisms provided in the paper. Their simulation results show that, the presented
approach is better than PGP. But it has some limitations like clustering. MANET dynamic
topology and unpredictable nodes position, made clustering challengeable.
Data confidentially: According to this service, each node or application must have access to
specified services that it has the permission to access. Most of services that are provided by data
confidentially use encryption methods but in MANET as there is no central management, key
distribution faced lots of challenges and in some cases impossible. Authors in [14] proposed a
new scheme for reliable data delivery to enhance the data confidentially. The basic idea is to
transform a secret message into multiple shares by secret sharing schemes and then deliver the
shares via multiple independent paths to the destination. Therefore, even if a small number of
nodes that are used to relay the message shares, been compromised, the secret message as a whole
is not compromised. Also this way protects network, but packet delivery delay will be increased.

The reason is that, data is sent in multipath. Using multipath delivering causes the variation of
delay in packet delivery for different packets. It also leads to out-of-order packet delivery.
Integrity: According to integrity, just authorized nodes can create, edit or delete packets. As an
example, Man-In-The-Middle attack is against this service. In this attack, the attacker captures all
packets and then removes or modifies them. Authors in [15] presented a mechanism to modify the
DSR routing protocol and gain to data integrity by securing the discovering phase of routing
protocol.
Non-Repudiation: By using this service, neither source nor destination can repudiate thier
behaviour or data. In other words, if a node receives a packet from node 2, and sends a reply,
node 2 cannot repudiate the packet that it has been sent. Authors in [16] presented a new
approach that is based on grouping and limiting hops in broadcast packets. All group members
have a private key to ensure that another node couldn’t create packets with its properties. But
creating groups in MANET is challengeable.
Till now we discussed security services challenges in MANET. Detecting and eliminating
malicious nodes, is another aspect of the MANET security. In the next section, we will discuss
some important attacks in MANET and ways to detect and eliminate them.
3.2. Attacks
As described before, MANET has lots of characteristics like hop by hop communications,
wireless media, open border and easy to setup, that made it popular. whoever these characteristics
made it popular for malicious nodes. Here are some important attacks in MANET:
Black Hole Attack: In this attack, malicious node injects fault routing information to the network
and leads packets toward itself, then discards all of them [17-19]. We presented a comprehensive
review in this attack in our previous work [20]. We present some ways to detect and eliminate
black hole nodes, also we present some classifications in black hole. In [21] authors presented a
new approach to detect black hole by sending packets in shared paths and also fetching sequence
number of packets. This attack is against routing and is depended on routing protocol.
Worm Hole Attack: In worm hole attack, an attacker records packets at one location of network
and tunnels them to another location [22]. Fault routing information could disrupt routes in
network [23]. Authors in [24] presented a way to secure MANET against this attack by using
encryption and node location information. But as mentioned before, key distribution is a
challenge in MANET.
Byzantine attack: In this attack, malicious node injects fault routing information to network, in
order to locate packets into a loop [25, 26]. One way to protect network against this attack is
using authentication. Authors in [27] presented a mechanism to defeat against this attack using
RSA authentication.
Snooping attack: The goal of this attack is accessing to other nodes packets without permission
[28]. As in MANET packets transmitted hop by hop, any malicious node can capture others
packets.
Routing attack: In this attack, malicious nodes try to modify or delete node’s routing tables [17,
18, 29]. Using this attack, malicious nodes destroy routing information. Therefore, packet
overhead and processing time will increase.

Resource consumption attack: The goal of this attack is wasting network or node’s resources
[30, 31]. As a way to do this, malicious nodes lead packets to a loop. Therefore, nodes resources
consume so fast.
Session hijacking: Session hijacking is a critical error and gives an opportunity to the malicious
node to behave as a legitimate system [32, 33]. Using this attack, malicious node reacts instead of
true node in communications. Cryptography is one of the most efficient ways to defeat this
attack.
Denial of service: In this attack, malicious node prevents other authorized nodes to access
network data or services [34-38]. Using this attack, a specific node or service will be inaccessible
and network resources like bandwidth will be wasted. In addition, packet delay and congestion
increases.
Jamming attack: Jamming attack is a kind of DOS attack [39]. The objective of a jammer is to
interfere with legitimate wireless communications. A jammer can achieve this goal by either
preventing a real traffic source from sending out a packet, or by preventing the reception of
legitimate packets [40].
Impersonation Attack: Using this attack, attacker can pretend itself as another node and injects
fault information to the network [41-43]. As MANET has open border and hop-by-hop
communications, it’s hardly vulnerable against this attack. In some cases even using
authentication is useless.
Modification Attack: In this attack, malicious nodes sniff the network for a period of time. Then,
explore wireless frequency and use it to modify packets [44, 45]. Man-in-the-middle is a kind of
Modification attack.
Fabrication Attack: In fabrication attack, malicious node destroys routing table of nodes by
injecting fault information [46-48]. Malicious node creates fault routing paths. As a result, nodes
send their packets in fault routes. Therefore, network resources wasted, packet delivery rate
decreased and packet lost will growth.
Man-in-the-middle attack: In this attack, malicious node puts itself between source and
destination. Then, captures all packets and drops or modifies them [49-51]. Hop by hop
communications are made MANET vulnerable against this attack. Authentication and
cryptography are the most effective ways to defeat this attack.
Gray Hole Attack: This attack is similar to black hole. In black hole, malicious node drops all
packets, while in this attack, malicious node drops packets with different probabilities [52-55]. As
it relays some packets, detecting this attack is more complicated than black hole and some
detection approaches like sniffing or watchdog will be useless in it.
Traffic Analyse Attack: The goal of this attack is sniffing network traffic to use them in another
attack or in a specific time [44, 56]. Malicious node captures all packets to use them later.

4. INCORPORATING SECURITY AND OTHER CHALLENGES
One way to provide security in MANET, besides decreasing network overhead, is to incorporate
security approaches with other challenges. In this way, both challenges are solved by improving
security parameters in total. We discuss these combinational approaches as follows:
Secure routing protocols: Using this method, security will be guaranteed in routing phase.
When a node wants to create a path to a destination, it uses some mechanisms to select a secure
path. Then malicious nodes will be detected and eliminated. Authors in [57] presented a secure
routing protocol based on using IPSEC in MANET routing protocols. Authors in [58] presented a
trust based security routing protocol to create secure path. In MANET, there is more than one
path between two different nodes. Selecting best path based on both routing and security, will
improve security parameters.
Security in QOS: Providing security has negative impact on QOS. Therefore, providing QOS
beside security is important. Authors in [59] presented a game theory to make a trade-off between
security and QOS. Authors in [60] provided an approach that creates QOS aware multipath
between source and destination with link information. By providing security in QOS, a level of
security and QOS will be guaranteed with low time or network overhead.
Cluster-based Security: These mechanisms use clustering in network to provide more efficient
situations for security protocols. Generally in these methods, clusters are used for key distribution
or as central management. Using clustering for security goals is important as it could solve
problems in key distribution or key management. Authors in [61, 62] provides a key distribution
mechanism by using clusters. Using clusters make it easy for security mechanisms, but grouping
nodes in clusters and maintaining clusters, are challengeable.
As another benefit of these combinational approaches, there should be a trade-off between
challenges based on each one’s importance. Based on application, one challenge may be more
important than the other one. Then, an algorithm may be proposed with better security
parameters. For example, when selecting best path in routing is not as important as security, an
approach can choose more secure paths without emphasizing on best routing path. As an
example, in AODV routing protocol, the path with low sequence number is chosen as the best
path. The reason is that, if there be a malicious node, it will send high sequence number.
5. ANALYSES AND DISCUSSION
Previous sections discussed attacks and security services in MANET. This section presents an
analytics and classification on previous issues. In order to analyses attacks and their behaviour,
we presented analyses in each attack in Table 1. For each attack five important parameters has
been discussed. These parameters are as follows:
• Violated Service: Each attack breaks a security service. We presented the most important
defeated service in this column.
• The Proposed Solutions: Some of the most effective approaches to detect and eliminate
malicious nodes.

• MANET features which lead to this attack: Each malicious node uses a feature or features
of MANET to break the security.
• Attack Type: Lots of researches classified attacks in two mainly class that are as follows:
Active attack, Passive attack. In passive attacks, malicious node listens to transmissions
without any active injection or effect on network[63]. While, in active attacks malicious
node inject information.
• Attack Goal: The most important goal of each attack.
From Table 1it’s obvious that lots of attacks are against availability. In availability aimed attacks,
malicious nodes inject fault routing information or destroy nodes routing tables in order to defeat
availability. As another point in Table 1, sniffing is one of the widely used mechanisms to defeat
against attacks. Generally in sniffing mechanisms, sniffer put it-self in promiscuous mode and
listen to the network traffic. In this way, it can detect misbehaviour of malicious nodes. As
another effective defeating approach, we can name encryption and route information. Encryption
mechanism defeat packets against accessing or modification. Malicious nodes can’t modify
encrypted packets. Whoever, they can drop packets and break availability. Routing information in
MANET is nightly variable. Routing information approach, secure MANET using additional
controller packets. There are six different defeating mechanisms as presented in Table 1.
Defeating approaches are important in MANETs security. Therefore, an analytics on these
approaches is presented in Table 2.
Table 1: Analytics on MANET Attacks.

Each proposed solution uses some of network resources in order to detect an attack. Table 2
presents five important parameters for security mechanisms and discussed the effect of each
proposed solution in parameters. In order to analyses the energy consumption of approaches; we
compare energy consumption in each approach toward others. The word ‘low’ means it consumes
lower energy than other approaches. Also, accuracy refers to ability in defeating single or
cooperative malicious nodes. In the case of cooperative attacks, malicious nodes work with each
other in order to cover their tracks.
Routing information approach generates controller packets and uses them in order to detect
malicious nodes. In addition, in some cases nodes must keep additional routing table like DRI
[19]. As mentioned, in sniffing each node must put it-self in promiscuous mode and capture all
packets transmission in its range. This feature of sniffing wastes nodes energy. Also it increases
process and memory overhead. In the case of cooperative malicious nodes, sniffing is useless as
malicious nodes may work with each other to proof them-selves as trustable nodes.
Redundancy and dynamic frequency approaches can’t detect the malicious nodes. These
approaches can only avoid network from an attack. In the case of misbehaviour, these approaches
can detect attack, while they are unable to detect the malicious nodes or eliminate them from
whole network. In other work, these approaches can just find the path with malicious nodes.
In routing information, control packets transmission increase processing time. In encryption and
authentication, key distribution is an important challenge, because of lack of central infrastructure
or key distribution center. Therefore, each malicious node can pretend it-self as a trustable node
and take part in key distribution. In redundancy, destination must buffer packets in order to get
packets in sequence or to compare them with each other. In addition, it increases traffic overhead
by sending duplicated packets. That cause increasing in congestion, packet lost and energy
consumption.
In addition of five important parameters, Table 2 presents some limitations on each defeating
approaches. These limitations come from each approaches characteristics. These limitations
decrease performance or efficiency of each approach.
6. FUTURE DIRECTIONS OF RESEARCHES
Until now we briefly discussed the security challenges in MANET and present some analytics in
them. In this section we present open research issues.
Routing information approaches are suitable in all types of MANET. In this approach, reducing
packet overhead and processing time, beside increasing accuracy is an important challenge. By
increasing accuracy, it can detect cooperative malicious nodes. With decreasing processing time
of this approach MANETs flexibility will increase.
Sniffing approach is useful in the case of single attacks, as it is unable to detect cooperative
nodes. Whoever, it waste nodes energy and it is not suitable in MANET with high speed nodes.
Finding a more effective way to calculate the threshold and present effective detection mechanism
forasmuch as decreasing time and packet overhead is the open border of research in sniffing
approaches. Beside it, detecting cooperative malicious nodes is challengeable. In order to solve this
challenge comparing sniffing with other defeating approaches is recommended.

Table 2: Analysis at the proposed solutions
MANET is self-organized, self-configurable network without any centralized control. Therefore,
encryption and authentication are challengeable. Key distribution and control unit are the most
important challenges. One way to over through these challenges is using clustering; therefore, the
Cluster Head can act as the key distributer. Because of MANETs dynamic topology, creating and
maintain clusters is highly challengeable. Using fuzzy logic [64] or swarm based [65] is highly
recommended for this challenge. As another research interest, decreasing processing time and
processing overhead of encryption approach can be mentioned.
Redundancy approaches, generate lots of duplicated packets and waste nodes resources. Also it
increases congestion and packet lost. Effectively choosing number of duplicated paths, based on
risk level, is highly challengeable. Also combining this approach with some other approaches in
order to detect malicious nodes is another challengeable issue.
Dynamic frequency is effective in multi-type MANETs. By using this approach in multi-type
MANET, each node secures its packets by sending in different frequencies. In addition, breaking
one frequency has no effect on others. This is a challenge in this approach.

7. CONCLUSION
Mobile Ad Hoc Network (MANET) is a kind of Ad hoc network with mobile, wireless nodes. In
MANET, all nodes are free to join and leave the network. Features of MANET like dynamic
topology and distributed network, made it popular and also challengeable. Open network
boundary, dynamic topology and hop by hop communications made security the most important
challenge in MANET.
In this paper, we presented a comprehensive review on security challenges in MANET. We
divided security in two aspects: security services and attacks. We discussed each one in detail;
also we introduced security parameters that are important in MANET security. Finally some
analyses and classifications in security approaches were presented. As a result of our analyses,
securing network in routing path using route table information, and encryption, are two efficient
ways to secure MANET. Each of these approaches have some benefits and limitations. As
military applications are one of MANET’s applications, encryption is important to avoid
malicious nodes to access data packets.
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AUTHORS
Ali Dorri received his B.S. degree in computer engineering from Bojnord University, Iran, in
2012, and now is student in M.S in software engineering in Mashhad branch, Islamic Azad
University, Mashhad, Iran. His research interests cover Wireless Sensor Networks (WSN),
Mobile Ad hoc Network (MANET) and specially Security challenges.
Dr. Seyed Reza Kamel Tabbakh is with the Department of Software Engineering, Faculty
of Engineering, Islamic Azad University - Mashhad branch, Mashhad, Iran. He received his
PhD in communication and network engineering from University Putra Malaysia (UPM) in
2011. He received his BSc and MSc in software engineering from Islamic Azad University,
Mashhad branch and Islamic Azad University, South Tehran branch, Iran in 1999 and 2001
respectively. His research interests include IPv6 networks, routing and security. During his
studies, he has published several papers in International journals and conferences.
Esmaeil Kheirkhah received his Bachelor and Master in Computer Science and
Mathematics from Islamic Azad University, Mashhad, Iran in 1992 and 1996 respectively.
He also received his PhD in Computer Science from National University of Malaysia
(UKM) in 2010. He is currently an assistant professor at the Islamic Azad University of
Mashhad. His research interests include the Software Engineering, Requirements
Engineering, End-User Computing, and semantic-enabled software engineering.

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