Wireless sensor networks

OPTIMAL JAMMING ATTACK
STRATEGIES IN WIRELESS
SENSOR NETWORKS
PRESENTED BY,
ARCHANA.B,NITHIYA.K
III CSE
KINGS COLLEGE OF ENGINEERING

OBJECTIVES
The objective of this paper is to detect the
jammer and avoid the collisions in
wireless sensor networks.

CONTENT:
 Jamming attack in wireless sensor
network
Optimal jamming attacks
Defense policy
Modeling Assumptions
Attack detection model

INTRODUCTION
In this paper the fundamental characteristic
of wireless networks that Renders them more
vulnerable to attacks than their wire line
Counterparts Is the open, shared nature of their
medium this exposes .
If the attacker abuses a protocol with the
primary goal to obtain performance benefits
itself, the attack is referred to as misbehavior.

EXSISTING SYSTEM:
The sensor node, looses its energy
continuously so it is failed because of
attacker attacks.
 It take more time to transfer the
information because of the retransmission
process again and again.

PROPOSED SYSTEM
Using the monitoring node the attacker is
detected.
The attacker is release power signals at
that time the sensor node is act as
sleeping node so does not loses the
consumed energy.

WSN & WSN ATTACKS:
WSN(WWiirreelleessss SSeennssoorr NNeettwwoorrkkss))
TTyyppeess ooff aattttaacckk iinn WWSSNN
 Passive Attack
 Active Attack
PASSIVE ATTACK : Passively absorping ongoing
communication
ACTIVE ATTACK : Attacker is involved in transmission

DOS ATTACKS
Depending on whether one looks at the
cause of the consequence of it miss
behavior in Wireless Networks stems.
The utility is expressed in terms of
consumed energy or achievable
throughput on per link or end_to_end
basis.

JAMMER
Jammer is neither authenticated nor
associated with the network.
The attacker attempt to strike a balance
short and long term benefits.

sensor node
monitoring node
jammer/attacker

OPTIMAL ATTACK
We derive the optimal attack and optimal defense
strategies as solution to optimization problems
that are faced by the attacker.
For attack detection we provide a methodology.
We include in the formulation the attack
detection.

ATTACK DETECTION MODEL
The monitoring mechanism consists of ,
Determination of a subset of
nodes(M).
1.Employment of a detection
algorithm.
2.A detection algorithm is part of the
detection module.

TYPES OF LINK LAYER JAMMER
Deceptive,
Random,
 Reactive jammer.

REACTIVE JAMMER
The reactive jammer is the most sophisticated
one as it launches its attack after sensing
ongoing transmission.
Channel surfing involves on-demand
frequency hopping as a countermeasure.

DETECTION ALGORITHM
 A detection algorithm is part of the
detection module at a monitor node; it takes as
input observation samples obtained by the
monitor node (i.e., collision/not collision)
 decides whether there is an attack or not. On
one hand.

OBSERVATION WINDOW
The observation window should be small
enough, such that the attack is detected in a
timely manner and appropriate
countermeasures are initiated.
 On the other hand, this window should be
sufficiently large, such that the chance of a
false alarm notification is reduced.

CONCLUSION
We studied controllable jamming attacks in
wireless sensor networks, which are easy to
launch and difficult to detect and confront.
Our work is a first step towards understanding
the structure of these problems.
Interesting issues arise in multi-channel
networks.

Wireless sensor networks

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