The Danger of Minimum Exposures
Understanding Cross-App Information Leaks on iOS through Multi-Side-Channel Learning
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Traces
The following figures show the traces of global statistics when three iOS apps, YouTube, Amazon, and Spotify are launched. Each data point in the figures shows the value change of the channel compared to the last reading. The APIs are called periodically at the frequency of 500 times per second. We can see from the figure that the user’s activities can be roughly identified by eyeballing the traces of CPU, memory, and network statistics.
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cow faults
wire count
user time
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