1. PARADIS: Wireless Device Identification with Radiometric Signatures
Vladimir Brik, Suman Banerjee, Marco Gruteser, Sangho Oh
Present by Taodun Li

2. Problem Statement
Device identity management is important for network security
MAC address in a frame is easy to forge
Solution for wired network cannot be adopted

3. Previous Solution
WLAN administrators rely on various cryptographic mechanisms for wireless device identity management and access control

4. No two NICs are identical
Solution in This Paper
No two NICs are identical
Radiometric identity can be observed in its radio transmissions and be used to discern different NICs

5. PARADIS Schematic

6. Overview of Modulation Mechanisms
The 4 symbols of QPSK on I/Q plane
Modulation errors

7. Modulation Error Metrics
EVM is not used by PARADIS
Normalize data before applying a classification algorithm

8. Get Signature PARADIS-KNN - Outlier：
- Discards outliers one by one until only half of
the training signatures remain
PARADIS-SVM
- Calculate a special matrix WA
- WA ∙S-b >0 if S is from a frame sent by A
- WA ∙S-b <0 Otherwise

9. Identification For both KNN and SVM:
Return the identity that appears most frequently among the computed best matches
In case of a tie, the identity with the greatest cumulative similarity is chosen

10. Comparison of PARADIS and other studies
Evaluation
Comparison of PARADIS and other studies

11. Performance of PARADIS-SVM
Evaluation
Performance of PARADIS-SVM

12. Performance of PARADIS-KNN
Evaluation
Performance of PARADIS-KNN

13. Conclusion PARADIS outperforms the other state-of-art techniques.
PARADIS is capable of achieving accuracy in excess of 99%
PARADIS is resilient to mobility, varying noise and hardware aging

14. Thank you!