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

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Presentation transcript:

“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 10/27/2019 10/27/2019 2

Outline Information Security 101 Wireless Channel Characteristics Wireless Physical Security 10/27/2019 10/27/2019 3

Security Model Secrecy / Confidentiality Authentication / Integrity 10/27/2019

Encryption Conventional Encryption (Shared Key Encryption, Symmetric Encryption) 10/27/2019 10/27/2019 5

Encryption Public-Private Key Encryption (PKI, asymmetric encryption) 10/27/2019 10/27/2019 6

Encryption Shared Key PKI Fast Hard in key distribution Slow Easy in key distribution But require infrastructure 10/27/2019

Wireless Communication Channel uncorrelated at different locations 10/27/2019 10/27/2019 8

Wireless Communication Channel reciprocity 10/27/2019 10/27/2019 9

Wireless Signal Symbol 10/27/2019 10/27/2019 10

Key Generation Metrics Goals (controversial) Channel Response; Received Signal Strength, Phase Goals (controversial) fast strong 10/27/2019

Generation Procedures Probing / Sampling Quantization Information Reconciliation Privacy Amplification 10/27/2019

Design Issues Probing Sampling time duplex Time selective Interpolation ---finite impulse response (FIR) fractional delay filter Time selective Frequency selective Sampling Autocorrelation -- key strength Frequency (open question) 10/27/2019

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 10/27/2019

10/27/2019