PARADIS: Wireless Device Identification with Radiometric Signatures

Vladimir Brik, Suman Banerjee, Marco Gruteser, Sangho Oh

Present by Taodun Li

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

Previous Solution

• 802.11 WLAN administrators rely on various cryptographic mechanisms for wireless device identity management and access control

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

PARADIS Schematic

Overview of Modulation Mechanisms

The 4 symbols of QPSK on I/Q plane Modulation errors

Modulation Error Metrics

• EVM is not used by PARADIS• Normalize data before applying a classification algorithm

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∙

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

Evaluation

Comparison of PARADIS and other studies

Evaluation

Performance of PARADIS-SVM

Evaluation

Performance of PARADIS-KNN

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

Thank you!