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Dr. Shaoen Wu School of Computing networks.csm Shaoen.wu@usm

“ Hello Bob, Alice ” ---Secure wireless communication with mutual link information ( a tutorial perspective ). Dr. Shaoen Wu School of Computing http://networks.cs.usm.edu Shaoen.wu@usm.edu. Outline. Information Security 101 Wireless Channel Characteristics Wireless Physical Security.

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Dr. Shaoen Wu School of Computing networks.csm Shaoen.wu@usm

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  1. “Hello Bob, Alice”---Secure wireless communication with mutual link information(a tutorial perspective) Dr. Shaoen Wu School of Computing http://networks.cs.usm.edu Shaoen.wu@usm.edu

  2. Outline Information Security 101 Wireless Channel Characteristics Wireless Physical Security 8/21/2014 2

  3. Outline Information Security 101 Wireless Channel Characteristics Wireless Physical Security 8/21/2014 3

  4. Security Model • Secrecy / Confidentiality • Authentication / Integrity

  5. Encryption Conventional Encryption (Shared Key Encryption, Symmetric Encryption) 8/21/2014 5

  6. Encryption • Public-Private Key Encryption (PKI, asymmetric encryption) 8/21/2014 6

  7. Encryption • Shared Key • Fast • Hard in key distribution • PKI • Slow • Easy in key distribution • But require infrastructure

  8. Wireless Communication Channeluncorrelated at different locations 8/21/2014 8

  9. Wireless Communication Channel reciprocity 8/21/2014 9

  10. Wireless Signal Symbol 8/21/2014 10

  11. KeyGeneration • Metrics • ChannelResponse;Received SignalStrength, Phase • Goals (controversial) • fast • strong

  12. Generation Procedures • Probing / Sampling • Quantization • Information Reconciliation • Privacy Amplification

  13. Design Issues • Probing • time duplex • Interpolation ---finite impulse response (FIR) fractional delay filter • Time selective • Frequency selective • Sampling • Autocorrelation -- key strength • Frequency (open question)

  14. Design Issues • Quantization • More levels, more bits, but less agreement • Information Reconciliation --- key agreement • hash (verification) + exhaustive search (correction) • Correction codes • interactive information reconciliation protocol • Privacy Amplification • Leftover hash lemma

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