1. “Hello Bob, Alice” ---Secure wireless communication with mutual link information (a tutorial perspective)
Dr. Shaoen Wu
School of Computing

2. Outline Information Security 101 Wireless Channel Characteristics
Wireless Physical Security
10/27/2019
10/27/2019 2

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

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

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

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

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

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

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

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

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

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

13. 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

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
10/27/2019

15. 10/27/2019