Anonymity in Wireless Networks Under Traffic Analysis Attacks

1. Hugo Moreira de Sousa Pinto Professor Daniel Lucani Professor João Barros Anonymityin Wireless Networks UnderTrafficAnalysisAttacks

2. SecurityinCommunications • Authentication • Access Control • Data Confidentiality • Data Integrity • Non Repudiation • Wireless Networks • Sessionanonymity • Dummytransmissions • Schedulingmechanisms • Measures to deter violationsthatinvolvethetransmissionofinformation • Anonymity – hidingthepartiesinvolvedin a communication Anonymity in Wireless Networks Under Traffic Analysis Attacks

3. ProblemSetup A1 A2 A3 Wireless Line network A1 A2 A1 <-> A2 A1 A2 A3 A1 -> {A2,A3} Anonymity in Wireless Networks Under Traffic Analysis Attacks • Typesofsessions • UnicastSessions: • e.g.VoIPconversation • MulticastSessions: • e.g. Sharing a picture

4. Scheduling – 3 nodeline network • Pattern 1 • Pattern 2 NotAnonymous Anonymous Anonymity in Wireless Networks Under Traffic Analysis Attacks

5. Design Objectives • Scalable to longer networks • Maximize throughput • Minimize energy • Possibilityofsimultaneoustransmissions A1 A2 A3 A4 A5 A6 Providesessionanonymity Anonymity in Wireless Networks Under Traffic Analysis Attacks

6. Costofanonymity K=3 • Unicast sessions: A1 A2 A3 A4 A5 • For k>=5 wehavefreeanonymityintermsofthroughput Anonymity in Wireless Networks Under Traffic Analysis Attacks

7. Conclusionsand future work • Sessionanonymity • No costinthroughput • Highcostinenergyifthe network sizeis too long • Use oftransmissionmechanismssuch as network coding • Doublethroughput • Reduceenergyconsumptionbyhalf • Studytrade-offsbetweenanonymityandcost • Lookintodifferent network topologies Anonymity in Wireless Networks Under Traffic Analysis Attacks