Physical Layer Security in Wireless Networks

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4 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio Physical Layer Security in Wireless Networks

5 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio What About Security? Physical Layer Security in Wireless Networks

6 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio What About Security? Traditionally a higher-network-layer issue Physical Layer Security in Wireless Networks

7 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio What About Security? Traditionally a higher-network-layer issue Encryption can be complex and difficult without infrastructure (e.g, in ad-hoc networks) Physical Layer Security in Wireless Networks

8 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio What About Security? Traditionally a higher-network-layer issue Encryption can be complex and difficult without infrastructure (e.g, in ad-hoc networks) Information theoretic security characterizes the fundamental ability of the physical layer to provide security (confidentiality) Physical Layer Security in Wireless Networks

9 Key Techniques for Improving Capacity & Reliability: Multiple-Antenna Systems (MIMO) Cooperation & Relaying Cognitive Radio What About Security? Traditionally a higher-network-layer issue Encryption can be complex and difficult without infrastructure (e.g, in ad-hoc networks) Information theoretic security characterizes the fundamental ability of the physical layer to provide security (confidentiality) Caveat: This is still largely a theoretical issue Physical Layer Security in Wireless Networks

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23 W0 W 1 Receiver 1 Receiver 2 W 0 Receiver 1 Receiver 2 Physical Layer Security in Wireless Networks

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34 Authentication [w/ Lai, El-Gamal IT 09]: Cheating probability is characterized for authentication in noisy channels. Feedback [e.g., w/ Lai, El-Gamal IT 08, w/ Liu, Tang, Spasojevic IT 09 & w/ Kim IT 10]: Judicious use of feedback enhances security. Code Design [e.g., w/ Liu, Liang, Spasojevic IT (under review)]: Nested structure for secure error-control codes for the wire-tap channel. Cross Layer Design Physical Layer Security in Wireless Networks

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40 Many electronic information sources are publicly accessible Google, Facebook, open governance, census, etc. The utility of these sources depends on their accessibility But, they can also leak private information Physical Layer Security in Wireless Networks

41 Privacy is not secrecy: Physical Layer Security in Wireless Networks

42 Privacy is not secrecy: An information theoretic characterization: equivocation-distortion [w/ Sankar, Rajagopalan, IT (under review)] Physical Layer Security in Wireless Networks

43 Privacy is not secrecy: An information theoretic characterization: equivocation-distortion [w/ Sankar, Rajagopalan, IT (under review)] Can consider multiple queries (successive disclosure) & multiple databases (side information) Physical Layer Security in Wireless Networks

44 Privacy is not secrecy: An information theoretic characterization: equivocation-distortion [w/ Sankar, Rajagopalan, IT (under review)] Can consider multiple queries (successive disclosure) & multiple databases (side information) Application to smart grid: competitive privacy & smart metering [w/ Sankar, Kar, Tandon & w/ Rajagopalan, Sankar, Mohajer SmartGridComm 11] Physical Layer Security in Wireless Networks

45 Thank You!

CSci 530 Midterm Exam. Fall 2012

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