Majorppt

Data Sensing & Secured Data Forwarding in multi-hop Wireless Sensor Network using MICAz based motes,[object Object],Presented by,[object Object],JayantPathak (2006ECS22),[object Object],Kumar Vikramjeet (2006ECS50) ,[object Object], ,[object Object],Under the Supervision of,[object Object],Mrs. Sonika Gupta ,[object Object]

Introduction to WSN,[object Object], A wireless sensor network (WSN) is a wireless network consisting of spatially distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants at different locations.,[object Object],Characteristics of WSN ,[object Object], Very Limited Resources,[object Object], Unreliable Communication,[object Object], Unattended Operation,[object Object]

Wireless Sensor Networks,[object Object],Sensor nodes sense the data & send it upward in the network hierarchy,[object Object],Base Station logs the collective data. ,[object Object],Sensor nodes/motes may act as router & perform data aggregation ,[object Object]

APPLICATIONS Of WIRELESS SENSOR NETWORKS,[object Object]

Benefits of Multi-hop network,[object Object],Access Point based Network,[object Object],Multi-hop network,[object Object],AP-based topology with maximum coverage and throughput environment is challenging.,[object Object],Range & data transfer is affected by,[object Object], - node location,[object Object], - type of house,[object Object],Multi-hop topology - design of future home wireless networks and requirements for future wiﬁ-enabled consumer electronic devices,[object Object],Advantages ,[object Object], - wide coverage attained by nodes location ,[object Object], - implementation of mesh ,[object Object]

Security threats in Sensor Networks,[object Object],Adversaries can easily sniff on, intercept, inject and alter transmitted data.,[object Object],Adversaries can Interact with networks from a distance by inexpensive radio transceivers and powerful workstations.,[object Object],Resource consumption attacks - Adversaries can repeatedly send packets to drain nodes battery and waste network bandwidth, can steal nodes.,[object Object]

Example of Intruder,[object Object],Attacks,[object Object],Type 1,[object Object],Type 2,[object Object],Battery consumed,[object Object],Bandwidth loss,[object Object],Data packet,[object Object],Data packet,[object Object],A,[object Object],B,[object Object],Attacked(packet spoofed),[object Object],IN,[object Object],False packet,[object Object],False packet,[object Object],False packet,[object Object]

Solutions of threat,[object Object],A specific frequency channel is allocated to WSN at a time which is designated by RF_Channel,[object Object],Group_id should be altered manually ,[object Object],RF_Channel altered manually after regular interval,[object Object],Each pair of motes share different symmetric keys.,[object Object],All communication are encrypted symmetric keys between motes.,[object Object]

Diffie-Hellman Key Exchange Algorithm ,[object Object],[object Object]

Each side then generates a public key (letter B), which is a derivative of the private key.

The two systems then exchange their public keys. Each side of the communication now has their own private key and the other systems public key (letter C).

The Diffie-Hellman protocol generates “shared secrets” – identical cryptographic key shared by each side of the communication.,[object Object]

Sensor node Architecture,[object Object],[object Object]

processes data and controls the functionality of other components in the sensor node.

The functionality of both transmitter and receiver are combined into a single device know as transceivers

Sensors sense or measure physical data of the area to be monitored.

The continual analog signal sensed by the sensors is digitized by an Analog-to-digital converter and sent to controllers for further processing.

Power consumption in the sensor node is for the Sensing, Communication and Data Processing.

kinds of memory are on-chip memory of a microcontroller and Flash memory

Transceiver: TI CC2420 802.15.4/ZigBee compliant radio 2.4-2.48 GHz (250 kbps data rate)

Platforms: TinyOS, SOS, MantisOS and Nano-RK Support

2.6-3.3 V power supplyIn Context of MICAz motes,[object Object]

Appropriate encryption for WSN,[object Object],Encryption security depends on Key size & No. of rounds ,[object Object],Key length is limited by the limited processing power of motes,[object Object],Keysize Processing energy Battery life,[object Object],Skipjack is probable candidate ,[object Object],Block size = 64 bits,[object Object],Key length = 80 bits No. of Rounds = 32 ,[object Object],More No. of Rounds ,[object Object],More time needed to crack the key ,[object Object]

Majorppt

Majorppt

Recomendados

Más contenido relacionado

La actualidad más candente

La actualidad más candente(20)

Destacado

Destacado(9)

Similar a Majorppt

Similar a Majorppt(20)

Último

Último(20)

Majorppt