9. EXPERIMENTAL EVALUATION

Our evaluation covers three major aspects of our system: a) how well does our scavenging scheme perform over a Vidonn X5 phone usage dataset, b) how e ective is our jamming scheme in blocking interaction between the phone and other NFC devices, and c) a demonstration of EnGarde's capability to perform targeted jamming of malicious tags while allowing benign ones to interact with the Otium Shine.

9.1 Scavenging performance

Our rst evaluation looks at the performance of the scavenging subsystem. Since this evaluation depends on the actual time for which the Vidonn X5 is unlocked, and the duration between unlock events, we perform a trace-driven simulation using traces provide by the LiveLab project at Rice University[12]. These traces were collected from 35 users over the span of a year and contain the screen unlock data n ... Read more »