Wireless sensor networks combine sensing, computation and communication capabilities into small sensor nodes. A wireless sensor network consists of multiple sensor nodes that communicate wirelessly to perform distributed sensing tasks. Each sensor node contains components for power, computation, sensing and communication. Security is important for wireless sensor networks due to their widespread applications and vulnerabilities like traffic analysis attacks and Sybil attacks. Common security techniques for wireless sensor networks include encryption, cryptography and access control protocols.

1. Wireless Sensor Network & Security
TEJAS WASULE
(IT 2nd
Year)
SURAJ JAIWAL
(IT 2nd
Year )
Presented by-

2. What is Wireless Sensor
Networks?
WSN combines sensing, computation,
and communication into single tiny
device called sensor node.
Group of sensors linked by wireless
media to perform distributed sensing
task

3. What is Sensor Node?
Sensor is a device, which senses
information and passes it to the mote.
Figure : Wireless sensor network device

4. Progression of Sensor
Technology
Figure : Progression of sensor technology
(motes) over time

5. Architecture of a Sensor
Node
 A Power unit (Battery)
 Computational logic & Storage
 Sensor Transducer
 Communication
 Components of Sensor Node
1. HARDWARE

6. Architecture of a Sensor
Node
Figure : The architecture of a sensor node.
Contd..

7. 2. SOFTWARE
Operating System Microcode
Sensor Drivers
Communication Processors
Communication Drivers
Data Processing Mini-Apps

8. Specific Sensor Node
Sensor Node:
Processor: 4Mhz
Memory: 128KB Flash & 4KB RAM
Radio: 916Mhz and 40Kbits/second.
Transmission Range: 100 Feet
TinyOS:
Operating System(small)
Open Source
Energy Efficient

9. Available Wireless Technologies

10. Available Wireless Technologies
Standard Data Rate Range Power
Consumption
ZigBee
(802.15.4)
20 kbps to
250 kbps
Up to 10 m Ultralow
Bluetooth
(802.15.1)
Up to 3 mbps 1m to 100 m low
Wi-Fi
(802.11)
54 mbps 45 m to 90
m
Medium
Contd…

11. Need of Security
 WSNs are becoming a cost effective,
practical way to go about deploying
sensor networks.
 Protecting confidentiality, integrity
and availability of communications.
 Large range of applications from
civilian to military purposes.

12. Need of Security
• Obstacles:
 Very-Limited Resources
 Unreliable Communication
 Unattended Operations
• Attacks:
 Sybil Attack
 Traffic Analysis Attacks

13. Need of Security
• Attacks:
1) Sybil Attack:
Introduced by “Brain Zill” in 2002
Subverted by Foreign identities in
peer-to peer Network
2) Traffic Analysis
Intercepting & Examine messages to
deduce info. from patterns in
Communications.
Able to detect Encrypted messages but
Not able to Decrypt it.

14. Security for Sensor Network
 SMACS :
Self organizing medium access
control for sensor networks.
 Encryption:
Encoding info. in such a way that
hackers can’t read it, but authorized
one can.
 Cryptography & Steganography:
Techniques for Secure
Communication in presence of Third
parties.

15. Application of WSN
 Home and Office Applications
 Environmental Applications
 Medical & Health Applications
 Military Applications

16. Advantages
 Implementation cost is cheaper
than wired network
Ideal for non-reachable places
 It avoids hell lot of wiring
It can accommodate new devices
at any time

17. Disadvantages
 Less secure because hacker's laptop
can act as Access Point.
 Lower speed as compare to wired
networks.
 Affected by surrounding. E.g.: walls
(blocking), microwave oven , far distance

18. Conclusion
 The low cost, flexibility, fault tolerance,
high sensing fidelity and rapid deployment
makes way for new applications on remote
sensing.
 Realization needs to satisfy the constraints
such as scalability, topology changes,
power consumption, environment etc.
 New wireless ad hoc networking
techniques are required to overcome this
constraints.

19. References
 Wireless Sensor Network (KAZEM
SOHRABY, DANIEL MINOLI,
TAIEB ZNATI)
 System Architecture for Wireless
Sensor Networks (Jason Lester Hill)
 http://today.cs.berkeley.edu/800dem
o/.s
 http://www.powerstream.com
 http://www.wikipedia.com

20. THANK
YOU..!

21. .....?