retroworks writes "NY Times has an interesting story on how NSA put transistors into the USB input devices of PC, allowing computers unplugged from the internet to still be monitored, via radiowaves, from up to 8 miles away. The article mainly reports NSA's use of the technology to monitor Chinese military, and minor headline reads "No Domestic Use Seen". A link inside the story leads to a Dutch news article which maps placement of the monitoring system in 50,000 PCs. The source of the data was evidently the leak from Edward J. Snowden."
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