PERFORMANCE ANALYSIS OF ROUTING ROTOCOLS IN MANET UNDER MALICIOUS ATTACKS

International Journal of Network Security & Its Applications (IJNSA) Vol. 11, No.2, March 2019
DOI: 10.5121/ijnsa.2019.11201
PERFORMANCE
PROTOCOLS
1
School of Business and Technology, Gloucestershire University, Cheltenham, England
ABSTRACT
MANETs routing protocols are vulnerable to various
hole and black-hole attacks. These routing protocols are unprotected and subsequently result in various
kinds of malicious mobile nodes being injected into the networks. In this paper, three types of a
as selfish, grey-hole and black-hole attacks have been applied to two important MANET routing protocols;
Ad-hoc On demand Distance Vector (OADV) and Dynamic Source Routing (DSR) in order to analyse and
compare the impact of these attacks on the
packet loss and consumption of energy.
KEYWORDS
Mobile Ad-Hoc Networks, DSR, AODV, Routing Protocols, Wireless Network Security, Malicious Node,
Network Performance
1. INTRODUCTION
Mobile ad-hoc networks are composed of a number of wireless mobile devices called nodes as
shown in figure 1. These networks have no fixed infrastructure and no central administration.
MANETs are characterised by resource constraints, dynamic topology, and openness to wire
media. However, wireless networks have a number of vulnerabilities, which may be exploited by
hackers to gain access to the network to steal or tamper with data [4, 11].
In this paper, the performance of two MANET’s routing protocols; Ad
Vector (AODV) and Dynamic Source Routing (DSR) have been analysed under malicious attacks
[10].
ERFORMANCE ANALYSIS OF ROUTING
ROTOCOLS IN MANET UNDER MALICIOUS
ATTACKS
Dr. Gorine1
and Rabia Saleh
MANETs routing protocols are vulnerable to various types of security attacks such as selfish nodes, grey
hole attacks. These routing protocols are unprotected and subsequently result in various
kinds of malicious mobile nodes being injected into the networks. In this paper, three types of a
hole attacks have been applied to two important MANET routing protocols;
hoc On demand Distance Vector (OADV) and Dynamic Source Routing (DSR) in order to analyse and
compare the impact of these attacks on the network performance based on throughput, average delay,
packet loss and consumption of energy.
Hoc Networks, DSR, AODV, Routing Protocols, Wireless Network Security, Malicious Node,
works are composed of a number of wireless mobile devices called nodes as
MANETs are characterised by resource constraints, dynamic topology, and openness to wire
hackers to gain access to the network to steal or tamper with data [4, 11].
In this paper, the performance of two MANET’s routing protocols; Ad-hoc On deman
Figure 1. MANET architecture
1
OUTING
ALICIOUS
types of security attacks such as selfish nodes, grey-
hole attacks. These routing protocols are unprotected and subsequently result in various
kinds of malicious mobile nodes being injected into the networks. In this paper, three types of attacks such
hole attacks have been applied to two important MANET routing protocols;
hoc On demand Distance Vector (OADV) and Dynamic Source Routing (DSR) in order to analyse and
network performance based on throughput, average delay,
Hoc Networks, DSR, AODV, Routing Protocols, Wireless Network Security, Malicious Node,
works are composed of a number of wireless mobile devices called nodes as
MANETs are characterised by resource constraints, dynamic topology, and openness to wireless
hoc On demand Distance

2
2. RELATED WORK
Mobile Ad Hoc Networks routing protocols have been the subject of intense research in the past
20 years. Many researchers have been studying the performance of a single protocol under
several attacks, but attempts are carried out on performance analysis of routing protocols under
malicious attacks.
In [15], the authors evaluated the performance of AODV routing under black-hole, grey-hole,
selfish and flooding attacks. Their finding is that black-hole and flooding attacks have a severe
impact on the AODV performance compared to selfish and grey-hole attacks.
In 2016, the authors [16], also focused on the impact of the black hole, flooding and rushing
attacks against AODV. They compared the performance of AODV under attacks with the original
AODV in terms of Packet Delivery Ratio, Average End to End Delay and Average Throughput.
They concluded that the performance of AODV degrades under the attacks. Their finding is that
black hole attack has a higher significant effect on the network performance than flooding and
rushing attacks.
In [17], the authors conducted a comparative study between AODV and DSR routing protocols,
but under wormhole attacks only. Their simulation results show that DSR performs better than
AODV under wormhole attacks in MANET. They concluded that the high performance of DSR is
due to the alternative data delivery path provided by DSR.
However, in our research paper, a comparative study between AODV and DSR routing protocols
subject to several attacks including back-hole, grey-hole and selfish node attacks.
3. SECURITY GOALS
The majority of previous security studies define five major security goals which are required for
attacks' prevention [7].
Like all wireless networks, MANETs need is to achieve the security goals, such as
confidentiality, authentication, integrity, availability, and data freshness.
3.1. DATA CONFIDENTIALITY
Routing and packet forwarding information must remain confidential. To keep the confidentiality,
it is required to ensure to disclose data packets to authorized nodes only. Data encryption is a
common method of ensuring confidentiality
3.2. DATA AUTHENTICATION
Authentication ensures that data packets or communications between nodes are accessible by only
authorised nodes. Without authentication, a malicious node can masquerade as a trusted node in
MANET and can have a negative impact on data transmission between nodes.
3.3. DATA INTEGRITY
Integrity ensures that data must not be changed in transit, and steps must be taken to ensure that
data cannot be altered by unauthorized nodes.

3
For example, a malicious node may add some packets or modify data within a packet before
forwarding the corrupt data to its neighbour.
3.4. DATA AVAILABILITY
Availability ensures that services provided by nodes should be available to their users even under
attacks, such as energy starvation, denial of service and a misbehaving node.
3.5. DATA FRESHNESS
Even if confidentiality and data integrity have been achieved it is imperative to ensure that no old
data have been replayed. This requirement of fresh data is important when dealing with shared-
keys which need to be changed over time.
4. ROUTING PROTOCOLS IN MANET
Protocols are defined as the set of rules which are used by network devices to communicate
between them. Due to mobility nature of nodes of MANET and the dynamic network topology,
an effective routing protocol is needed to manage the communication between the nodes within
the network.
Routing protocols in MANET’s routing protocols are divided into two groups; proactive and
reactive routing protocols [1].
In this paper, the performance of two MANET’s routing protocols; Ad-hoc on demand Distance
Vector (OADV) and Dynamic Source Routing (DSR) have been analysed under normal operation
4.1. AD-HOC ON DEMAND DISTANCE VECTOR ROUTING (AODV)
Ad hoc On-Demand Distance Vector (AODV) is a routing protocol for mobile ad hoc networks
(MANETs) and other wireless ad hoc networks with a large number of mobile nodes [14]. The
protocol’s algorithm creates a route between two nodes only when the route is requested by the
source node. This route will remain active as long as the source node has data packets to send to
the destination node. However the route will be dropped as soon as the source stops sending data
packets.
AODV uses optimisation; this will reduce the overhead in the network. Optimisation in AODV,
being the “time-to-live” field will limit propagation in route requests when they are sent. The
time-to-live field can fluctuate if there is no route reply.
4.2. DYNAMIC SOURCE ROUTING (DSR)
DSR is a fully reactive routing protocol [17]. It is a source routing protocol meaning that a packet
carried in the network contains an ordered list of all nodes through which the packet must be
routed.
The DSR protocol is composed of two mechanisms that work together to allow the discovery and
maintenance of source routes in the ad hoc network as shown in figure 2:
• Route Discovery is the mechanism by which a node S wishing to send a packet to a
destination node D obtains a source route to D. Route Discovery is used only when S
attempts to send a packet to D and does not already know a route to D.

International Journal of Network Security & Its Applications
• Route Maintenance is the mechanism by which node S is able to detect, while using a
source route to D, if the network topology has changed such that it can no longer use its
route to D because a link along the route no longer works. When Route Maintenance
indicates a source route is broken, S can attempt to use any other route it happens to know to
D, or can invoke Route Discovery again to find a new route. Route Maintenance is used only
when S is actually sending packets to D.
5. SECURITY THREATS
Due to the lack of infrastructure and the dynamic nature of MANET, they are more likely to be
open to attacks [2], which may disturb the relationship of trust between nodes. These MANETs'
characteristics allow attackers to readily target the network and
jamming and disturbing the communication between trusted nodes.
In mobile ad-hoc networks, attacks can be classified as active and passive attacks [3]. In passive
attacks, attackers only listen to the traffic for information with
process, which compromises confidentiality such as snooping, eavesdropping, traffic analysis and
monitoring. Whereas active attacks destroy, steal or modify useful information as well as
damaging network operations, such a
routing attacks and selfish attacks.
In this paper, three types of attacks have been investigated; these are grey
attacks and selfish node attacks.
5.1. SELFISH NODES ATTACKS
A selfish node is a type of routing protocol attack at the Data link layer, in which a malicious
node deviates from the original routing and forwarding of packets.
Due to the limitation of resources
resources by refusing to forward packets to other nodes [5]. There are two types of selfish nodes:
• The first type shares the routing table
destinations.
• The second type do not share their
routing protocol, a selfish node may decide to drop all RREQ packets received or not forwarding
a route reply RREP packet to its destination.
Route Maintenance is the mechanism by which node S is able to detect, while using a
because a link along the route no longer works. When Route Maintenance
when S is actually sending packets to D.
Figure 2. DSR protocol diagram
HREATS IN MANET
characteristics allow attackers to readily target the network and jeopardis
jamming and disturbing the communication between trusted nodes.
hoc networks, attacks can be classified as active and passive attacks [3]. In passive
attacks, attackers only listen to the traffic for information without disturbing the normal routing
damaging network operations, such as wormhole, black hole, grey hole, information disclosure,
and selfish attacks.
In this paper, three types of attacks have been investigated; these are grey-hole attacks, black
attacks and selfish node attacks.
TTACKS
node deviates from the original routing and forwarding of packets.
to the limitation of resources wireless networks, selfish nodes seek to conserve their
t type shares the routing table but drops packets instead of forwarding them to their
• The second type do not share their routing tables, with their neighbours. For example, in DSR
a route reply RREP packet to its destination.
(IJNSA) Vol. 11, No.2, March 2019
4
Route Maintenance is the mechanism by which node S is able to detect, while using a
because a link along the route no longer works. When Route Maintenance
se its resources by
hoc networks, attacks can be classified as active and passive attacks [3]. In passive
out disturbing the normal routing
s wormhole, black hole, grey hole, information disclosure,
hole attacks, black-hole
, selfish nodes seek to conserve their own
but drops packets instead of forwarding them to their
routing tables, with their neighbours. For example, in DSR

5.2. BLACK HOLE ATTACKS
Black-hole attacks happen at the Ne
nodes that it has the shortest route to their destination node. The malicious node will drop all data
packets or implement man-in
number (3) sends fake routing information by advertising that it has the shortest path to the
destination node (4). When the node (1) wants to send a packet data to the node (4), it will initiate
route discovery. The malicious node (3) intercepts the RREQ pa
the sender node (1). If the reply from the malicious node (3) reaches the source first, then the
sender node (1) disregards all other RREP messages and start sending packets through node (3).
Therefore, all packets are lost o
5.3. GREY HOLE ATTACKS
The grey-hole attack takes place at the network layer and can be used as a slow poison in the
network side [12].
A grey-hole attack happens when a
destination node with the intention of intercepting data packet. However instead of forwarding the
data packet, the malicious node (i.e. the grey
three ways:
• Drops packets sent by specific nodes while forwarding packets sent by the other nodes.
• The malicious node drops all packets received within a specific period of time and forward
packets later.
• The grey-hole drops the intercepted packets randomly and
• The grey-hole attack is more difficult to detect than the black hole attack in which the
malicious node drops all the packets received.
6. METHODOLOGY
Three types of research methods are used for evaluating the performance of wireless
physical measurement, analytical methods and network simulation.
TTACKS
hole attacks happen at the Network layer [6], in which a malicious node declares to other
in-the-middle attack. For example in figure 3, the malicious node
mber (3) sends fake routing information by advertising that it has the shortest path to the
route discovery. The malicious node (3) intercepts the RREQ packet and sends a reply RREP to
Therefore, all packets are lost or consumed at the malicious node.
Figure 3. Black hole attack
TTACKS
hole attack takes place at the network layer and can be used as a slow poison in the
hole attack happens when a malicious node advertises itself as having a valid route to the
e malicious node (i.e. the grey-hole) may exhibit its malicious behaviour in one of
Drops packets sent by specific nodes while forwarding packets sent by the other nodes.
The malicious node drops all packets received within a specific period of time and forward
hole drops the intercepted packets randomly and forward other packets.
hole attack is more difficult to detect than the black hole attack in which the
malicious node drops all the packets received.
Three types of research methods are used for evaluating the performance of wireless
physical measurement, analytical methods and network simulation.
5
twork layer [6], in which a malicious node declares to other
middle attack. For example in figure 3, the malicious node
mber (3) sends fake routing information by advertising that it has the shortest path to the
cket and sends a reply RREP to
hole attack takes place at the network layer and can be used as a slow poison in the
advertises itself as having a valid route to the
hole) may exhibit its malicious behaviour in one of
Drops packets sent by specific nodes while forwarding packets sent by the other nodes.
The malicious node drops all packets received within a specific period of time and forward
forward other packets.
hole attack is more difficult to detect than the black hole attack in which the
Three types of research methods are used for evaluating the performance of wireless networks:

6
In this research paper, a network simulator called ns2 is selected as it is currently the best-known
network simulation package for research into wireless networks [8,13]. ns-2 is written in C++,
which uses MIT’s Object Tool Command Language (OTcl) as the command and configuration
interface.
The simulator is invoked via the ns interpreter and the OTcl scripts defined the simulation rules.
ns-2 provides substantial support for the simulation of TCP/ UDP, routing, multicast protocols
over both wired and wireless, local and satellite network.
Currently ns-2 development is supported by the Defence Advanced Research Projects Agency
(DARPA).
7. IMPLEMENTATION
In this research paper, NS2 (v2.34) is used as the network simulator [9] and was run under
Ubuntu v14.04 operating system.
The network consists of 50 wireless nodes spread randomly in a terrain area of 700m x 1000m
with simulated waypoint mobility model time of 100, 300, 500, 700 and 900 seconds. The
simulation used the random, which has become a "benchmark" model for evaluating the routing
protocols of MANET.
The aim of the simulation is to evaluate the network performance by measuring the following
parameters: throughput, average delay, packet loss and energy per byte.
These parameters are defined as follow:
• Throughput: The total number of packets successfully received by the destination node.
• Packet Loss: The number of packets dropped during the simulation.
• Average delay: The average time taken by data packets to travel between the source and
destination nodes.
• Energy per byte: The amount of energy consumed by nodes to transmit and receive the
number of data packets.
In this experiment, the performance of two protocols namely; Dynamic Source Routing (DSR)
and Ad-Hoc on Demand Distance Vector (AODV) are evaluated in two separate scenarios. The
first one when the network is operating under normal conditions (i.e. without attacks or malicious
nodes) and the second scenario, the network is operating under attacks (i.e. with some malicious
nodes). The simulation is repeated ten times split equally between AODV and DSR protocols
with different time scale (100, 300, 500, 700 and 900).
8. RESULTS OF SIMULATION OF MANET UNDER ATTACKS
In this part of the experiment, the network is simulated under attack by several malicious nodes
including black-hole attack, selfish node attack and grey-hole attack under both AODV and DSR
protocols.
The selfish nodes are implemented to drop just route request and route reply, because if a node is
not involved in route discovery, it will not be used in forwarding data packets. However, black
hole nodes are implemented to drop data packets, forward routing requests and reply packets,
because the attack affect routing operation. By contrast, the grey-hole attack is similar to the

black hole attack with inconsistent behaviour, as it will drop selective data packets and forward
others.
8.1. SELFISH NODES ATTACKS
THROUGHPUT OF THE PRO
In Figure 4 the graph shows the throughput in the protocols with selfish nodes, in which their
percentages vary from 10% to 50%. It is clear that AODV is much better than DSR to deliver
packets successfully in this kind of attack.
Figure 4. Throughput of
AVERAGE DELAY OF THE PROTOCOL
As can be seen from Figure 5, average delay of DSR is higher than AODV. Because DSR is an
On-Demand source routing protocol, this can be considered as the major reason fo
route is discovered only when needed and also, the mechanism for route discovery happens each
time as well as, several paths to the destination is di
delay. On the other hand, AODV has just one path for
is updated permanently based on a sequence number. Thus, that leads to a slight end to end delay.
Also, AODV was not impacted very much with increase in the percentage of selfish nodes, unlike
DSR, which was impacted when selfish nodes increased
Figure 5. Average delay of the protocols with selfish nodes
TTACKS
HROUGHPUT OF THE PROTOCOLS UNDER SELFISH NODES:
Figure 4 the graph shows the throughput in the protocols with selfish nodes, in which their
packets successfully in this kind of attack.
Figure 4. Throughput of the protocols with selfish nodes
ELAY OF THE PROTOCOLS UNDER SELFISH NODES
Demand source routing protocol, this can be considered as the major reason fo
time as well as, several paths to the destination is discovered. Consequently, DSR has
delay. On the other hand, AODV has just one path for each destination in its routing table, which
acted when selfish nodes increased.
Figure 5. Average delay of the protocols with selfish nodes
7
Figure 4 the graph shows the throughput in the protocols with selfish nodes, in which their
Demand source routing protocol, this can be considered as the major reason for DSR delay. A
scovered. Consequently, DSR has higher
each destination in its routing table, which

PACKET LOSS OF THE PR
From line graph in Figure 6, it is obvious that
despite DSR being better in normal protocols. While AODV as a standard protocol does not have
better performance than DSR, in the case of selfish nodes it is better in performance than DSR.
Figure 6.
ENERGY PER BYTE OF TH
Figure 7 illustrates the energy per byte which is consumed during participation in routing
activities under different percentages of selfish nodes. It is
even when the percentage of selfish nodes reached 40%, while DSR was affected by the attack
and consequently, it consumed high amounts of energy when the attacks increased. Thus, AOD
outperforms DSR in terms of consuming
Figure 7. Energy per byte of the protocols with selfish nodes
ACKET LOSS OF THE PROTOCOLS UNDER SELFISH NODES:
gure 6, it is obvious that DSR was affected excessively by the selfish nodes,
Figure 6. Packet loss of the protocols with selfish nodes
NERGY PER BYTE OF THE PROTOCOLS WITH SELFISH NODES
activities under different percentages of selfish nodes. It is clear that AODV was nearly the same
it consumed high amounts of energy when the attacks increased. Thus, AOD
outperforms DSR in terms of consuming energy.
Figure 7. Energy per byte of the protocols with selfish nodes
8
DSR was affected excessively by the selfish nodes,
clear that AODV was nearly the same
it consumed high amounts of energy when the attacks increased. Thus, AOD

8.2 BLACK HOLE ATTACKS
THROUGHPUT OF THE PRO
Figure 8 illustrates throughput of both protocols under different percentages of black hole
and it is clear that both protocols are affected by increasing the percentage of the black hole
attack. However, it is obvious that DSR outperforms AODV when the percentage of attack nodes
has increased. This performance can be justified because of
AODV networks and their different techniques to achieve routing activities, such as the packet
salvage of the DSR protocol in NS2.
Figure 8. Throughput of the protocols with black hole attack
AVERAGE DELAY OF THE
In Figure 9, the line graph shows the average delay of both protocols under black hole nodes.
Both protocols have approximately the same nature in terms of performance when assessing the
average delay metric as the average delay fluctuated over the time of the simulation. However,
AODV suffered less delay than DSR in all the percentages of attacks, for the reasons discussed in
the previous section.
Figure 9. Average delay of the protocols with black hole attack
TTACKS RESULTS
HROUGHPUT OF THE PROTOCOLS UNDER BLACK HOLE ATTACK:
Figure 8 illustrates throughput of both protocols under different percentages of black hole
has increased. This performance can be justified because of the different nature of DSR and
salvage of the DSR protocol in NS2.
Figure 8. Throughput of the protocols with black hole attack
VERAGE DELAY OF THE PROTOCOLS UNDER BLACK HOLE ATTACK
average delay fluctuated over the time of the simulation. However,
Figure 9. Average delay of the protocols with black hole attack
9
Figure 8 illustrates throughput of both protocols under different percentages of black hole nodes,
the different nature of DSR and
K HOLE ATTACK:
average delay fluctuated over the time of the simulation. However,

PACKET LOSS OF THE PR
From Figure 10 below, it can be observed that packet loss for both protocols under black hole
nodes increases when the percentage of the attack is increased. Also, as discussed earlier in the
simulation of the normal protocols section, the DSR protocol has better performance than the
AODV protocol for the same reasons discussed in the normal protocol.
Figure 10. Packet loss of the protocols with black hole attack
ENERGY PER BYTE OF TH
Figure 11 below shows the energy consumption of the protocols under different percentages of
black hole attack. It is clear that DSR shows better performance than AODV, which increased
slightly when the black hole nodes increased
very much greater impact on AODV, which increased from 0.11 when the percentage of black
hole nodes was 10% to 0.68 when the attack increased to 50%.
Figure 11. Energy per byte of the protocols with
8.3. GREY HOLE ATTACKS
Grey-hole attack has the same impact as black hole attack on throughput, average delay and
energy consumption. However, it has a different effect on dropping packets in the protocols, for
ACKET LOSS OF THE PROTOCOLS UNDER BLACK HOLE ATTACK:
on of the normal protocols section, the DSR protocol has better performance than the
AODV protocol for the same reasons discussed in the normal protocol.
Figure 10. Packet loss of the protocols with black hole attack
NERGY PER BYTE OF THE PROTOCOLS UNDER BLACK HOLE ATTACK
slightly when the black hole nodes increased in the network, while the black hole attack had a
hole nodes was 10% to 0.68 when the attack increased to 50%.
Figure 11. Energy per byte of the protocols with black hole attacks
TTACKS
hole attack has the same impact as black hole attack on throughput, average delay and
10
on of the normal protocols section, the DSR protocol has better performance than the
ACK:
in the network, while the black hole attack had a
black hole attacks
hole attack has the same impact as black hole attack on throughput, average delay and

the reason that it is designed to drop fewer packets than the black hole because of its fluctuation
in behaviour. Consequently, at instance T1, a grey
T2 it becomes a malicious node.
DROPPED PACKETS IN TH
As can be seen from the below graph in Figure 12, packet loss is higher in AODV than in DSR.
The reason behind this is related to the same discussion as given above regarding selfish and
black hole attacks.
Figure 12. Packet loss of the protoco
9. CONCLUSION
Security is an important issue in MANET as hackers are finding new ways to intercept data
during their exchange between wireless nodes in order to steal or tamper
In this research paper, the performance of
by measuring several parameters under different attacks by introducing some malicious nodes
within the network.
Based on the simulation results, DSR was affected more by selfish nodes than AODV. However,
DSR performed better than AODV under black hole attack. In terms of average delay, under
selfish nodes and under black hole attack, AODV has better performance than DSR, which has
high average delay in all scenarios.
AODV performed better than DSR under sel
performed better than AODV.
In the case of energy per byte and under selfish nodes, DSR consumed less energy than AODV.
However, under black hole attack, DSR consumed more energy than AODV.
In summary, both DSR and AODV protocols have been affected by the attacks and their
performance decreased in all terms (i.e end
throughput). Therefore, such attacks need to be detected and prevented in MANETs.
signed to drop fewer packets than the black hole because of its fluctuation
in behaviour. Consequently, at instance T1, a grey-hole node behaves normally, while at instance
T2 it becomes a malicious node.
ROPPED PACKETS IN THE PROTOCOLS UNDER GREY HOLE ATTACK
Figure 12. Packet loss of the protocols under grey-hole attack
during their exchange between wireless nodes in order to steal or tamper with it.
In this research paper, the performance of two protocols namely; DSR and AODV are evaluated
R performed better than AODV under black hole attack. In terms of average delay, under
high average delay in all scenarios.
AODV performed better than DSR under selfish nodes, but under black hole attack, DSR
performed better than AODV.
However, under black hole attack, DSR consumed more energy than AODV.
R and AODV protocols have been affected by the attacks and their
performance decreased in all terms (i.e end-to-end delay, packet loss, energy consumption and
11
signed to drop fewer packets than the black hole because of its fluctuation
hole node behaves normally, while at instance
TTACK:
it.
two protocols namely; DSR and AODV are evaluated
R performed better than AODV under black hole attack. In terms of average delay, under
fish nodes, but under black hole attack, DSR
R and AODV protocols have been affected by the attacks and their
end delay, packet loss, energy consumption and

12
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PERFORMANCE ANALYSIS OF ROUTING ROTOCOLS IN MANET UNDER MALICIOUS ATTACKS

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PERFORMANCE ANALYSIS OF ROUTING ROTOCOLS IN MANET UNDER MALICIOUS ATTACKS