Security Infrastructure in VANETs

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Security Infrastructure in VANETs

• Ashwin Rao
• 2006ANY7513
• Supervisor Dr. Arzad A. Kherani

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Introduction

• Vehicular Ad hoc Networks (VANETs)
• Vehicle to Vehicle (V2V)
• Vehicle to Infrastructure (V2I).
• Different from traditional ad hoc networks
• Mobility at very high speeds
• Applications
• Early Warning Messages
• Traffic Optimisation
• Secure Transactions
• Time Criticality

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Need for Security

• Authentication
• Distinguish - Malicious and Genuine nodes
• Availability of Info. needed to Authenticate
• Anonymity
• Right to privacy
• Integrity
• Data received without any modifications.
• Low Overheads
• Overheads should retain usefulness

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1609.x Protocol Suite

• Application Class ID
• Application Context Mark
• Certificates CRLs
• Neighbour Information
• Priority queues for channel contention.

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Current Scenario

• Anonymity multiple certificates
• Data Integrity Authentication using EDSA
• Sha224 or Sha256 for hash
• NIST224 or NIST256 for curve values
• PKI Organisation CRL distribution mechanism
  absent in standard
• Time and Location from GPS

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CoS

• Criteria to accept and drop messages
• CoS Confidence in Security Infrastructure
• Freshness of Certificates
• Complements honest majority
• Cost overheads
• Freshness of CRLs
• Penetration Capacity of CRL Information
• CoS dependent on Security Infrastructure
• Performance dependent on CoS

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Factors Affecting Design Of Security
Infrastructure

• Storage capacity on OBU
• Limits max no. of CRLs in OBU
• Life time of certificates
• Relocation Model and Mobility model
• Interaction with vehicles
• CRL distribution
• More vehicles per CA, more information to
  propagate.

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Organisation of Security Infrastructure

• One CA for all
• Manufacturer Based
• A manufacturer or a representative of
  manufacturers
• Geographical
• One CA for all regions
• Each region has different CA
• CA represents a set of regions

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Future Work

• Analysis of different Security Infrastructure
  mechanisms
• Impact on CoS
• Impact on Performance
• Simulations to support theoretical results

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Conclusion

• Robust Security Infrastructure equally important
  for effective security.

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Thank You
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Some Questions

• Anonymity at the MAC Layer
• Deciding channel for communication
• Role of WBSS, Ipv6, TCP and UDP
• Abstract essentials for initial simulations

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Simulators to Use

• GrooveNet - CMU
• TraNS EPFL (built on ns)