Wireless Sensor Network & Security

TEJAS WASULE(IT 2nd Year)

SURAJ JAIWAL(IT 2nd Year )

Presented by-

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

What is Sensor Node?Sensor is a device, which senses

information and passes it to the mote.

Figure : Wireless sensor network device

Progression of Sensor Technology

Figure : Progression of sensor technology (motes) over time

Architecture of a Sensor Node

A Power unit (Battery) Computational logic & Storage Sensor Transducer Communication

Components of Sensor Node 1. HARDWARE

Architecture of a Sensor Node

Figure : The architecture of a sensor node.

Contd..

2. SOFTWARE

Operating System MicrocodeSensor DriversCommunication ProcessorsCommunication DriversData Processing Mini-Apps

Specific Sensor NodeSensor Node:

Processor: 4MhzMemory: 128KB Flash & 4KB RAMRadio: 916Mhz and 40Kbits/second.Transmission Range: 100 Feet

TinyOS: Operating System(small) Open Source Energy Efficient

Available Wireless Technologies

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…

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.

Need of Security

• Obstacles: Very-Limited Resources Unreliable Communication Unattended Operations

• Attacks: Sybil Attack Traffic Analysis Attacks

Need of Security• Attacks

:1) Sybil Attack:

Introduced by “Brain Zill” in 2002Subverted 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.

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.

Application of WSN

Home and Office Applications

Environmental Applications

Medical & Health Applications

Military Applications

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

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

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.

References

Wireless Sensor Network (KAZEM SOHRABY, DANIEL MINOLI, TAIEB ZNATI)

System Architecture for Wireless Sensor Networks (Jason Lester Hill)

http://today.cs.berkeley.edu/800demo/.s

http://www.powerstream.com http://www.wikipedia.com

THANK

YOU..!

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