In this respect, the network availability is exposed to many types of attacks. In this paper, Denial of Service (DOS) attack on network availability is presented and its severity level in VANET environment is elaborated. A model to secure the VANET from the DOS attacks has been developed and some possible solutions to overcome the attacks have been discussed.

1. Dr I.A.Sumra

2.  Vehicular ad-hoc network is a special kind of network in which
nodes (Vehicles) can communicate with each other on the road
and with its Infrastructure.
Road Side Unit (RSU)
V2V
V2V
Basic VANET Architecture
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V2I
Introduction

3.  Safety Applications
 Non Safety Applications
Work
in Progress
Plz! use Alt.
route
Work Zone
Warning:!!!
Work Zone
Warning:!!!
Shopping MALL
( TESCO )
Parking Slot
Available!!!
RSU Parking Slot
Available!!!
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4.  Vehicular network applications require security and the objective of these applications is to
serve users and make their journey secure and comfortable.
 Attackers have their own role in this network and we cannot predict the dynamic behavior of the
attacker. If an attacker works on a safety application and changes the content of the safety
message then it poses a very difficult condition on the road and many users will be affected due
to this kind of attack.
 Accidents are often the result of an alteration of any safety message or the sending of even one
wrong safety message in a network and many human lives are at risk [1].

5.  Network Behavior

6.  Attacker Behavior

7.  In VANET, DOS shall not be allowed to happen, where
seamless life critical information must reach its
intended destination securely and timely. In summary,
there are three ways the attackers may achieve DOS
attacks.
 There are three levels of DOS attacks as described
below.
1. Basic Level: Overwhelm the Node Resources
2. Extended Level: Jamming the Channel

8.  Basic Level: Overwhelm the Node Resources

9.  Extended Level: Jamming the Channel

14.  To achieve secure communication and network availability
must be obtained in the VANET set up. In this paper we have
discussed the different types of attacks that may be
applicable to VANET.
 We have proposed a model to provide solution to DOS and
 DDOS attacks, which the intention is to ensure network
availability for secure communication between the nodes.
 It found that network availability has been directly affected in
the case of DOS and DDOS attacks, where the attacks has led
to most severe impact by causing the network to break down.

15. 15

16.  Please download complete research paper from
research gate.
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