1. WIRELESS SENSOR NETWORK SECURITY USING GROUP KEY MANAGEMENT SCHEME Presented By: Mohammed Saleh CS 599a Fall06

2. WSN Background WSN Architecture WSN Security Issues and requirements Approach

3. Background 100/1000 nodes Low cost solution Limited resources Controlled or uncontrolled environment

4. WSN Architecture

5. A sensor Nodes Consist of: Battery Memory Processor Radio links for communicating

6. Sensor Node Constraints Battery Power/ Energy Processor Rechargeabilit y Sleep Patterns Memory

7. Network constraints Limited Pre-Configuration Unreliable communications Frequent Routing Changes

8. WSN Architecture

10. Security in Wireless Networks Security in Wireless Networks

11. Security Requirements Confidentiality Authenticity Integrity Freshness Scalability Availability Accessibility Self-Organization Flexibility

12. Security in Wireless Networks Attacks Poor physical protection Attacks not only from outside but also from within the network from compromised nodes.

13. WSN Attacks

14. Security in Wireless Networks Security concepts: Cryptography - Public/private key Diffie hellman

15. Group key protocol key establishment protocols can be classified into two categories: Group key management - Group key is usually created and updated by a central key server, and then securely distributed to all members. Tree-based key management - each node contributes a fraction of the group key and the creation and update of group key are the joint work of all members.

16. Group Key Mgmt