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Using Auxiliary Sensors for Pair-Wise Key Establishment in WSN

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. Outline. Introduction Pair-Wise Key Establishment Analysis and Discussion Comparison

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Using Auxiliary Sensors for Pair-Wise Key Establishment in WSN

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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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