VANET Security against Sybil Attack by Using New SRAN Routing Protocol

International Journal of Computer Applications Technology and Research
Volume 4– Issue 7, 535 - 539, 2015, ISSN:- 2319–8656
www.ijcat.com 535
VANET Security against Sybil Attack by Using New SRAN
Routing Protocol
Omkar Shete
Department of Computer Engineering
Sinhgad Academy of Engineering,
Pune University,
Maharashtra India
Sachin Godse
Department of Computer Engineering
Sinhgad Academy of Engineering,
Pune University,
Maharashtra India
Abstract: A VANET facilitates communicate between vehicles and between vehicles and infrastructure. Vehicular Ad-Hoc Network
is a sub type of Mobile Ad-Hoc Network i.e. MANET. Now days, road traffic activities are one of the most important daily routines
worldwide. VANET provides you most of information that are required for better safety and driving such as an accurate weather
description or early warnings of upcoming dangers. To successfully deploy VANET, security is one of the major challenges such as
protection from selfish vehicles that may block or mess traffic, bogus notifications etc. that may harm and losses lives, that must be
addressed. Sybil attacks have become a serious threat as they can affect the functionality of VANETs for the benefit of the attacker.
The Sybil attack is the case where a single faulty entity, called a malicious node, can create multiple identities known as Sybil nodes or
fake nodes. This project detects and prevents the Sybil attack using “Secure Routing for Ad Hoc Network” (SRAN) routing protocol.
SRAN is based on AODV protocol. In our proposed work, we have developed SRAN protocol to maintain routing information and
route discovery in such manner that will detect as well as prevent Sybil Attack. Each node will have a unique identity and their entry in
route table. SRAN Protocol easily detects such route that is not valid anymore for communication. It deletes all the related entries from
the routing table for those invalid routes.
Keywords: VANET, ITS, V2V, V2I/V2R, Sybil attack, Routing Protocols.
1. INTRODUCTION
The vehicular ad hoc network (VANET) is a special
communication pattern to provide communication information
within the roadside-to-vehicles and inter-vehicle with the aid
of wireless network and information technology. Road traffic
activities are one of the most daily routines of common men.
The increasing road accidents and traffic congestion are
becoming major problems. VANET, a sub type of Mobile Ad
hoc Networks is developed to solve these problems which
provides scalable and cost-effective solutions for applications
such as safety messaging, dynamic routing. VANETs are used
in many safeties, critical applications; one of the applications
considered in this paper is secure safety routing which is
meant for cooperative driving and avoidance of accidents.
Sybil attack is more dangerous than any other threat. It injects
malicious vehicles on the road.
2. VANET
VANET is considered as a subgroup of Mobile Ad-hoc
Networks (MANETs) in which all nodes are vehicles that
move at various speeds. The main objective of VANET is to
enable communication between vehicle to vehicle and in
between vehicle to infrastructure. Transportation system’s
safety, security and efficiency are improved by using
Intelligent Transportation Systems (ITS). ITS consist of
various technologies like communications, information
processing and control. The integration of ITS technologies
with VANET systems is intended to save time, money and
lives. There are two types of VANET, used for
communication. First, Inter-vehicular communication refers to
the kind of communication in which vehicles communicate
with each other via wireless technology, also referred to as
Vehicle-to-Vehicle communication (V2V) as shown in Fig. 1.
It shows when a vehicle breaks down, immediately, the
vehicle begins the information dissemination process using
the broadcast communication mode. The vehicles that are near
to the vehicle, which has broken down, re-transmit the
message. In this way vehicles are notified and can take
alternative routes, avoiding a possible problem of traffic
congestion. In second type vehicles and fixed infrastructure
exchange information. This communication mode is referred
to as Vehicle-to-Infrastructure (V2I) or Vehicle to Roadside
(V2R) communication. V2R is the direct wireless exchange of
relevant information between vehicles and the communication
units placed on the side of roads and avenues as shown in Fig.
2 [1].
Figure 1: V2V [1]
Figure 2: V2R/V2I [1]

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3. SECURITY IN VANET
As VANET is becoming more popular, a serious challenge in
this environment is security. As we mentioned previously,
VANET is sub branch of MANET. Consequently, VANETs
inherit all the security issues associated with MANETs. The
malicious behavior of users, such as the modification of the
messages, could be fatal to the other vehicular users, etc.
Security and privacy in vehicular networks are important for
their acceptance. VANETs’ architectures and communication
schemes provide developers an environment for the
deployment of a wide variety of applications. However, major
concerns of such environments are privacy and security.
Strong security mechanisms are required to protect both
applications and users from possible attacks. Therefore,
powerful schemes are required to protect users’ private
information.
VANETs’ security is of great importance because any
vulnerability could lead to disastrous accidents where
people’s integrity may be put at risk. Security mechanisms
and schemes guarantee the protection of personal data
transmitted through VANET but not to identity, location, and
destination, among others. In VANET, multiple threats or
attacks are possible. One of them is Sybil attack which is
considered as major threat.
The Sybil attack is a well-known harmful attack. In this
attack malicious vehicles are injected into same network. This
attack is very dangerous since a malicious vehicle can present
in different positions at the same time, thereby creating
massive security risks in the network. The Sybil attack harms
the network topologies and connections as well as network
lives. In Fig.3, an attacker ‘A’ sends multiple messages with
different identities to the other vehicles. Thus, other vehicles
understand that there is heavy traffic. In ad hoc networks,
there are three common types of security against sybil attacks
which are registration, radio resource testing, and position
verification. Registration itself is not sufficient to prevent
Sybil attacks, because a fake node has possibility to entry with
multiple identities by non-technical means such as stealing.
However, a strict registration may lead to serious privacy
problem. Radio resource testing is based on the assumption
that all physical entities are limited in resources. In position
verification the position of nodes will be verified. The goal is
to make sure that each physical or original node refers to one
and only one identity [2].
Figure 3: Traffic Congestion [2]
4. EXISTING SYSTEMS
In VANET highly challenging tasks is to transporting
information from one vehicle to another or all vehicles within
specified area. There are several routing protocols defined to
transporting information (2014) [2], (2012) [5]. In VANET,
the routing protocols are classified as:
In VANET, the routing protocols are classified into four
categories. These protocols are characterized on the basis of
area where they are most suitable [3], [4].
4.1 Topology Based Routing Protocols
These routing protocols use association information that exists
in the network to perform packet forwarding. This protocol
further divided into three types.
4.1.1. Proactive routing protocols: Proactive routing
protocols continuously try to maintain up-to-date routing
information on every node in the network.
Advantage: Routing information is already available when the
first packet is sent so connection times are fast.
Disadvantage: When there is no traffic, continuously use
resources to communicate routing information.
Types: DSDV, OLSR, CGSR.
4.1.2. Reactive/Ad hoc based routing: Reactive routing
opens the route only when it is necessary for a node to
communicate with other nodes. Reactive routing consists of
route discovery phase so that the query packets are flooded
into the network for the path search and this phase completes
when route is found.
Types: AODV, PGB, DSR, TORA, and JARR.
4.1.3 Hybrid Protocols: It is combination of proactive and
reactive routing protocols. The hybrid protocols are used to
reduce the control overhead of proactive routing protocols and
decrease the initial route discovery delay in reactive routing
protocols.
Types: ZRP, HARP.
4.2 Geographical Routing Protocols
Some routing protocols make use of geographical
information, such as GPS coordinates. Typically, nodes
communicate their location through the network, so that other
nodes can determine shortest path. Select shortest path by
using this geographical information.
Disadvantage: Each node need to know its location.
4.3 Cluster Based Routing Protocols
Cluster based routing is like in clusters. Cluster consists of the
group of nodes that identifies themselves to be a part of
cluster and a node is designated as cluster head will broadcast
the packet to cluster. Good scalability is essential
characteristic that can be provided for large networks but
network delays and overhead are occurred when forming
clusters in highly mobile VANET.
Types: COIN, LORA-CBF, TIBCRPH, and CBDRP.
4.4 Broadcast Based Routing Protocols:
In certain applications, the host has to send packets to many or
all other hosts. Sending a packet to all destinations at a time is
called Broadcasting. This broadcast based routing protocols
used in VANET for sharing weather, traffic, emergency and
road conditions among all the vehicles.
Types: BROADCOMM, UMB, V-TRADE, and DV-CAST.
Also, there are several secure routing protocols are
available and there comparison is shown in Table I [5].
Table 1: Analysis of Secure Routing Protocol

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5. PROPOSED WORK
In VANET, Security is most important factor for secure
communication. Sybil attack is one of the major threats in the
network. It injects multiple malicious vehicle nodes in the
network and that harms the networks or loosing life. We are
proposing new secure routing protocol named as Secure
Routing for Ad hoc Network (SRAN) routing protocol. This
SRAN protocol detects as well as prevents Sybil attack.
SRAN is based on AODV. This SRAN protocol does not
allow Sybil node into Route discovery, hence Sybil node is
eliminated from the route. Also using RSU we can remove
this Sybil node from the Network. In SRAN protocol we
consider the following factors.
5.1 Route Request Packet format:
In SRAN routing protocol, if source wants to send message to
destination then it first broadcasts the route request (RREQ) to
its neighbors. Neighboring node receives RREQ, if receiving
node is not destination and does not have route to the
destination then it rebroadcast the RREQ and same time
backward route is created to the source. If the receiving node
is destination node or it has current route to the destination
then Route Reply (RREP) is generated.
1) RREQ ID: A sequence number uniquely identifying
the particular RREQ when taken in association with
the source node's IP address.
2) Source IP Address: The IP address of the Source.
3) Source Sequence Number: The Sequence number of
Source.
4) Source Unique ID: The Unique Identification of
Source.
5) Destination IP Address: The IP address of the
destination for which a route is selected.
6) Destination Sequence Number:The latest sequence
number received in the past by the source for any
route towards the destination.
7) Destination Unique ID: The Unique Identification
of Destination.
8) Hop Count: Number of hops needed to reach
destination.
5.2 Route Reply Packet format:
RREP is unicast and it is hop by hop fashion to source. In
RREP each intermediate node creates the route to the
destination. When source node receives RREP then it records
the forward route to the destination and starts sending
message. If multiple RREP’s is received by source then
depending upon hop count shortest path is selected.
1) Destination IP Address: The IP address of the
destination for which a route is given.
2) Destination Sequence Number: The Destination
sequence number associated to the route.
3) Destination Unique ID: The Unique Identification
of Destination.
4) Source IP Address: The IP address of the Source.
5) Source Unique ID: The Unique Identification of
Source.
6) Lifetime: Time to reach to the next Destination.
7) Hop Count: Number of Hops needed to reach the
Destination.
5.3 Route Error Packet format
When link break down is detected, RERR is generated and
send to the source node in hop by hop fashion. When each
intermediate node invalidates route to an unreachable
destinations or Sybil node is detected then RERR is sent
towards source node. When source node receives RERR then
it starts reinitiates route discovery.
1) Unreachable Destination IP Address: The IP
address of the destination that has become
unreachable due to a link break.
2) Unreachable Destination Sequence Number: The
sequence number in the route table entry for the
destination listed in the previous Unreachable
Destination IP Address field.
3) Sybil Node: The information about sybil node
which detected.

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5.4 Route Maintenance
Once route is defined then route maintenance is also required.
It is to provide information about link of the route as well as
route to be modified due to movement of one or more nodes
in the route. Every time route is used to send packet then its
expiry time is updated by adding current time and Active
Route Timeout (ART). ART is a constant value that defines
how long new route is kept into routing table of node after last
transmission done. ART defines both source and intermediate
node. If route is not used in the predefined period then node
can’t be sure that route is still valid or not and then this route
is removed from routing table. It ensures that no any
unnecessary packet loss.
5.5 MATHEMATICAL MODEL
In our SRAN routing protocol we provide Unique Identity
(UID) field in routing table of each node. When source node
broadcasts then all nodes in the network will be verified
original node or Sybil node by using UID. From Eq. 1 we can
identify the original node and get unique identity of node.
A = {x | x=1 then it is original node}
B = {x | x=2 then it is malicious node}
Where, x = Unique Identity of node.
If ‘A’ condition is true then original route is follow and if ‘B’
condition is true then route is automatically eliminated.
5.6 Flow chart of Sybil attack Algorithm
Figure 4: Flow of Sybil attack algorithm.
Considering analysis of secure routing protocols use different
techniques to detect as well as prevent attacks. Sybil attack
gets all the properties of original node. When Sybil attack is
performed into this network then it first identifies the node as
source node, if yes then no attack is performed on that node. If
node is not source node then perform Sybil attack on that
node. In this attack one or more Sybil nodes are injected into
the network. This Sybil node can get all the properties of
original node but automatically increase the value of Unique
Identity as shown in Fig. 4. So when performing route
discovery each node can check UID value when it is one then
this node become a part of route. When UID value is not one
then this node is Sybil node that means it detects the Sybil
node and not gets into the route. So this Sybil node is
automatically prevented from the route.
Figure 5: Execution of SRAN Protocol
6. EXPECTED RESULTS
In SRAN protocol separate mechanisms are not used to detect
as well as to prevent sybil attack. So it improves the
performance of all route activities. It prevents those Sybil
nodes to come into that route. It shows total number of
packets have been successfully received from source to
destination and it also increases the throughputs. In Table II
shows RREQ in which UID field consider to identify original
node and fake node. Also it has very less delay because of on
demand route selection.
Table 2: RREQ
Source
ID
Dest.
ID
Source IP Dest. IP
UID
2 4 168.192.10.10 168.192.10.16 1
4 3 168.192.10.16 121.11.10.15 2
4 1 168.192.10.16 121.11.10.17 1

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7. CONCLUSIONS
Secure communication is one of the important challenges in
VANET. If communication is not secure then it can cause
fake messages delivery by malicious nodes, misguiding nodes
in the network. This may cause accidents or traffic jam on
road. Most of the routing protocols are not providing security
for data transmission. Instead of providing separate techniques
for attack detection and prevention we can provide in routing
protocols. It improves performance of VANET. This SRAN
protocol is designed for Sybil attack. SRAN routing protocol
provides unique identity to each node in its route table. Then
this SRAN routing protocol can easily identify fake node and
original node. Also it detects and prevents Sybil attack and
gives high performance.
8. REFERENCES
[1] J.A. Guerrero-Ibáñez, C. Flores-Cortés, and
SheraliZeadally, “Vehicular Ad-hoc Networks
(VANETs): Architecture, Protocols and Applications”,
Computer Communications and Networks © Springer-
Verlag London 2013.
[2] VinhHoa LA, Ana CAVALLI, “Securityattacks and
solutions in vehicular ad hoc networks: A survey”,
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(IJANS) Vol. 4, No. 2, April 2014.
[3] Mushtak Y. Gadkari, Nitin B. Sambre, “VANET:
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Aug. 2012), PP 28-38.
[4] M. Raya and JP. Hubaux, “Securing Vehicular Ad Hoc
Networks", Journal of Computer Security 15 (2007), PP
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[5] Omkar Shete ,SachinGodse “VANET: A Survey on
Secure Routing” ,International Journal of Science and
Research (IJSR) ISSN (Online): 2319-7064, Paper ID:
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[6] Wei-Shen Lai, Chu-Hsing Lin, Jung-Chun Liu, Yen-Lin
Huang, Mei-Chun Chou, “I-SEAD: A Secure Routing
Protocol for Mobile Ad Hoc Networks”, International
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[7] Panagiotis Papadimitratos and Zygmunt J. Haas, “Secure
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[8] yih-chunhu and adrianperrig, “Ariadne: A Secure On-
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[9] Seema Mehla, SeemaMehla and PreetiNagrath,
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[10] Alekha Kumar Mishra and BibhuDuttaSahoo, “A
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September ’09 | Volume 1: Issue 2, PP 443-447.

VANET Security against Sybil Attack by Using New SRAN Routing Protocol

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