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Enhancing Pair-Wise Key Establishment in WSN Using Auxiliary Sensors

This study proposes a novel scheme for establishing pair-wise keys in Wireless Sensor Networks (WSN) by deploying assisting sensor nodes. The scheme offers high key establishment probability, resilience to node compromise, and reduced overhead. The protocol involves initialization, pair-wise key establishment, and supplemental key establishment. Analysis and discussion focus on key establishment probability, resilience against node capture, and comparative security performance. The security reinforcing version addresses the compromise of assisting nodes. Overall, the scheme shows promise in improving key establishment efficiency and security in WSN.

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Enhancing Pair-Wise Key Establishment in WSN Using Auxiliary Sensors

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  1. Using Auxiliary Sensors for Pair-Wise Key Establishment in WSN Source: Lecture Notes in Computer Science (2010) Authors: Qi Dong and Donggang Liu Presenter: Hsing-Lei Wang Date: 2010/09/03

  2. Outline Introduction Pair-Wise Key Establishment Analysis and Discussion Comparison Security Reinforcing Version Conclusions

  3. Introduction • The proposed scheme’s main idea: • Deploy assisting sensor nodes to help key establishment between two regular sensor nodes • Advantages: • Very high probability of establishing a shared key • Majority of sensors only need to store a single key • High resilience to node compromise • Implementation on TelosB Motes

  4. Protocol Description(1/3) • Initialization • Let = network size, = assisting sensor nodes • Base station generates Master Key for node • Assisting node will get preloaded with • For instance, 1MB flash memory can store the hash images for 128,000 nodes (1 hash image=8bytes)

  5. Protocol Description(2/3) Assisting node i = 1,2,…,m Pair-Wise Key Establishment Assisting node i = 1,2,…,m

  6. Protocol Description(3/3) Supplemental Key Establishment

  7. Analysis and Discussion (1/3) Probability of Establishing Keys:

  8. Analysis and Discussion (2/3) Resilience against Node Capture

  9. Analysis and Discussion (3/3) • Overheads • Storage: • regular sensor: a single master key • assisting sensor: n hash values • Computation: • a few symmetric key operations and hash operations • Communication: • only one-hop range communication are needed in most case

  10. Comparison (1/2) Setting: Network size n =20,000 nodes Neighbors d =50 nodes Each sensor store =200 keys P=Probability of direct key between two sensor Security Performance

  11. Comparison (2/2) Setting: Network size n =20,000 nodes Neighbors d =50 nodes Each sensor store =200 keys P=Probability of direct key between two sensor Security Performance

  12. Security Reinforcing Version • Security issue: • Once an assisting node is compromised, the attacker will get all the hash values and discover all the random keys generated by the node • Method to fix: • Set a sequence number =0 and in initialization • After setup a pair-wise key between u and v,

  13. Conclusion • This paper developed a novel scheme to establish the pair-wise keys in WSN • Using of assisting sensor • The analysis indicates the scheme has several significant advantages over existing scheme • High probability to establishing shared keys • Good resilience against node capture • Lower overhead (storage, computation, etc.)

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