A New Type Of Coffee Shop Hacker

Most of us are aware that using a public wireless network such as those found in coffee shops and other establishments can be a pretty chancy undertaking; it's just too easy for skulduggery to take place. You should be fine if you are just working offline though, right? Right? Hmmm, maybe not.
If you're sitting in a coffee shop, tapping away on your laptop, feeling safe from hackers because you didn't connect to the shop's wifi, think again. The bad guys may be able to see what you're doing just by analyzing the low-power electronic signals your laptop emits even when it's not connected to the Internet.

Researchers at the Georgia Institute of Technology are investigating where these information "leaks" originate so they can help hardware and software designers develop strategies to plug them. By studying emissions from multiple computers, the researchers have developed a metric for measuring the strength of the leaks -- known technically as "side-channel signal" -- to help prioritize security efforts.
ScienceDaily

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