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© 2005, it - instituto de telecomunicações. Todos os direitos reservados. Anonymity in Wireless Networks Under Traffic Analysis Attacks Hugo Moreira de Sousa Pinto Professor Daniel Lucani Professor João Barros

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2 Security in Communications Measures to deter violations that involve the transmission of information Anonymity – hiding the parties involved in a communication Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011 Authentication Access Control Data Integrity Non Repudiation Data Confidentiality Scheduling mechanisms Dummy transmissions Wireless Networks Session anonymity

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3 Problem Setup Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011 A1A2A3 Wireless Line network Types of sessions Unicast Sessions: e.g. VoIP conversation Multicast Sessions: e.g. Sharing a picture A1A2 A1A2A3 A1 A2 A1 -> {A2,A3} Possible sessions A1 A2 A2 A3 A1 A3 A1 -> {A2, A3} A2 -> {A1, A3} A3 -> {A1, A2}

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4 Scheduling – 3 node line network Pattern 1 Pattern 2 Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011 t1t1 t2t2 t3t3 t4t4 A1 A2xxxx A3 t1t1 t2t2 t3t3 t4t4 A1x A2xx A3x Possible sessions A1 A2 A2 A3 A1 A3 A1 -> {A2, A3} A2 -> {A1, A3} A3 -> {A1, A2} Not Anonymous Anonymous Possible sessions A1 A2 A2 A3 A1 A3 A1 -> {A2, A3} A2 -> {A1, A3} A3 -> {A1, A2} Possible sessions A1 A2 A2 A3 A1 A3 A1 -> {A2, A3} A2 -> {A1, A3} A3 -> {A1, A2}

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5 Design Objectives Provide session anonymity Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011 t1t1 t2t2 t3t3 t4t4 t5t5 t6t6 A1 A2 A3 A4 A5 A6 Maximize throughput Minimize energy Possibility of simultaneous transmissions Scalable to longer networks A1A2A3A4A5A6 t1t1 t2t2 t3t3 t4t4 t5t5 t6t6 A1X A2 A3 A4X A5 A6 t1t1 t2t2 t3t3 t4t4 t5t5 t6t6 A1X A2XX A3XX A4XX A5XX A6X

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6 Cost of anonymity Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011 A1A2A3A4A5 K=3 For k>=5 we have free anonymity in terms of throughput

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7 Conclusions and future work Session anonymity No cost in throughput High cost in energy if the network size is too long Use of transmission mechanisms such as network coding Double throughput Reduce energy consumption by half Study trade-offs between anonymity and cost Look into different network topologies Anonymity in Wireless Networks Under Traffic Analysis Attacks IJUP - 18th February 2011

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