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SAT: Situation Aware Trust Architecture for Vehicular Networks

SAT: Situation Aware Trust Architecture for Vehicular Networks. Xiaoyan Hong, Univ of Alabama Dijiang Huang, Arizona State Univ Mario Gerla, UCLA Zhen Cao, UCLA. Vehicular networks (VANETs). Key applications: safe driving and roadway efficiency

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SAT: Situation Aware Trust Architecture for Vehicular Networks

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  1. SAT: Situation Aware Trust Architecture for Vehicular Networks Xiaoyan Hong, Univ of Alabama Dijiang Huang, Arizona State Univ Mario Gerla, UCLA Zhen Cao, UCLA

  2. Vehicular networks (VANETs) • Key applications: safe driving and roadway efficiency • Cars don’t crash: periodically communicate driving condi. • If crash happened: quick warning (than human reaction) to reduce chain reaction. • Other applications: • Turning cars into sensors! • Assisting massive evacuation • Forensic applications • Content distributions • … • Primary security goals: • The messages is trustable (the event, time, location) • Not misused by naïve drivers or malicious users. • Vehicle privacy

  3. Trust in Vehicular Networks Entity Trust Data Trust Hey budy, traffic ahead Hey budy, traffic ahead • Are you serious? • origin integrity • data integrity • Are you serious? • data evaluation • decision on event • Not adaptive to situation changes. • Mostly a reactive approach • Can we be more progressive ??

  4. Situation Aware Trust for VANETs Are you kidding? I am in the countryside Hey budy, traffic ahead • Key properties: preventive and predictive in building cryptographic foundation for trustworthy communication. • Proactive approach: set trust/security parameters ahead of time • Reduce on-line security/trust verification time • Enable security/trust in exceptional situations

  5. How to be Situation Aware? Situation? • Attribute based Trust • Situation elements are encode into • attributes • Static attributes (affiliation) • Dynamic attributes (time and place) time place affiliation …… Attributes bootstrapped by social networks Dynamic attributes can be predicted • Social Trust • Bootstrap initial trust • Transitive trust relations • Proactive Trust • establish trust in advance • predict based on mobility and location service An attribute based situation example: Yellow Cab AND Taxi AND Seattle Street AND 10-11pm 8/22/08

  6. Security on attribute and policy group Transportation agent: trying to alert taxi of companyA that there is an accident on Washington Street between 10-11am Extention of Attribute based Encryption (ABE) scheme [IEEE S&P 07] to incorporate dynamic access tree Attribute (companyA AND taxi AND Washington St. AND 10-11am) Ciphertext Receivers who satisfy those encoded attributes (has the corresponding private key) can decrypt the message Extended ABE Module plaintext Signature

  7. AND AND companyA 10-11 am Washington St. Access Control via ABE  MSK  PK         SKSarah: “companyA” “10:30am” “Washtington St.” SKKevin: “companyA” “10: 20 am” “Westwood”

  8. SAT Architecture: supporting situation awareness • SAT layer • Perception: communicate & sense environments • Comprehension: extract & aggregate situations • Projection: predict & create action profiles • Assessment: evaluate and adjust trust situations • Supporting and trust layer (STL) • Security primitive • Comm. primitive • Portal manage

  9. Social Trust Model • In case of infrastructure failure, e.g., messenger is blocked by traffic • Social network will help • People gang up into communities • One man help construct the policy group • Authenticate and encrypt the message • Trust service is still available for users How are you. People like to socialize Social trust is an incentive • Two important questions • How to establish social networks securely: authentication of social graph update information • How to incoporate social relations to SAT: social network provides dynamic attributes in the policy tree.

  10. Summary • Situation Aware Trust Architecture • Handle various situations and generate the needed security keys – location, time bounded, policy groups • SAT architecture components • Attribute based trust • Proactive trust • Social trust • Architecture enabling the model. • Contribution: Proactive VANET security for trustworthy communication! • Future work: Evaluation of the proposed scheme via testbed experiment and simulation efforts

  11. Thanks for your attention • Do NOT rent a cap without SAT

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