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Secure Local Data Aggregation and Delay Tolerant Dissemination in VANETs

Secure Local Data Aggregation and Delay Tolerant Dissemination in VANETs. Presented by Cesar Ghali Sky Faber Kyle Benson Quan Nguyen University of California, Irvine CS 234 – June, 2012. Introduction. Distributed event detection in Vehicular Adhoc NETworks

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Secure Local Data Aggregation and Delay Tolerant Dissemination in VANETs

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  1. Secure Local Data Aggregation and Delay Tolerant Dissemination in VANETs Presented by Cesar Ghali Sky Faber Kyle Benson Quan Nguyen University of California, Irvine CS 234 – June, 2012

  2. Introduction • Distributed event detection in Vehicular AdhocNETworks • Interested in detecting vehicle crash events • Collision will affect both nearby vehicles and vehicles approaching the site • Other vehicles may be present during such an event • May flood the wireless channel with crash data

  3. Data Aggregation • Minimize the amount of power consumed by radio transmissions • Extend the battery life • Reduce communication overhead

  4. Data Aggregation - Solutions • Minimum spanning trees (MST) • Maximize the degree • Maximize the number of hops • Leader election algorithm • Address the collision transmission problem in wireless networks • Time-constrained data transmission • Ensure that all data eventually reaches the sink

  5. Data Aggregation - Solutions • Flow updating • Broadcast- and gossip-based • Exploit the symmetry of the network flows • Hierarchical aggregation • Based on the distance form the origin

  6. Data Dissemination • Broadcast data to the local subsetnetwork • Locality • Quickly • Efficiently

  7. Data Dissemination - Solutions • Flash dissemination • Broadcast as fast as possible • Not scalable • CREW • Gossip-based • Prevent receiving multiple copies of the same message • Scalable

  8. Security Concerns • Jamming attack • Interfere the radio channel • Hidden vehicle • Adversary pretend to be in better position for broadcast • Results: stop broadcasting

  9. Security Concerns • Wormhole attack • Tunneling message from area A to area B using fast external channel • Authentic messages sent • Trick vehicles in area B • Sybil attack • Multiple fake identities • Fake positions

  10. Contributions • Design a protocol for event detection in VANETs • Initial event detection • Dissemination • Simulation on NS3

  11. Algorithm and System Design • Authentication of original event data • Based on flash dissemination • Built on top of a graph topology • Multiple observers agreement • Data integrity • Non repudiation • Designed for quick dissemination for most likely affected vihecle

  12. Evaluation

  13. Conclusion

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