15-03-2012, 04:22 PM
SECURITY CONCERNS IN WIRELESS SENSOR NETWORK
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What are WSN?
Large number of heterogeneous Sensor devices spread over a large field.
Wireless sensing + Data Networking. Group of sensors linked by wireless media to perform distributed sensing tasks
Applications of WSN
Military, Environmental, Health (Scanning), Space, Exploration,
Vehicular Movement, Mechanical stress levels on attached objects etc.
Obstacles to WSN Security
Very limited resources:
Limited memory and Storage space : A typical sensor has a 16 bit 8 Mhz CPU with 10K RAM, 48K Program Memory and 1M flash storage.
Power limitation
Obstacles to WSN Security -continued
Unreliable Communication :
Unreliable Transfer : Packet-based routing of the sensor network is connectionless hence unreliable.
Conflicts: Even if the channel is reliable, the communication may still be unreliable due to broadcast nature of WSN.
Latency: Multi-hop routing, network congestion and node processing can lead to greater latency in the network.
