Why you should keep your car keys in a metal coffee can

The dashboard of the software-updated Tesla Model S P90D shows the icons enabling Tesla's autopilot, featuring limited hands-free steering. Car-hacking is a threat that could become serious in the future, when driverless vehicles begin talking to one another. (Chris Walker/Chicago Tribune/TNS)

Top cybersecurity experts would never hang car keys on a hook near the back door or leave them sitting on a kitchen counter. The best strategy to prevent theft? Store the key fob in an old-fashioned metal coffee can. 

“Really, some cyber experts don't go to sleep without putting their key into a metal container,” said Moshe Shlisel, a veteran of the Israeli Air Force and now CEO of GuardKnox Cyber Technologies. “It's called a Faraday Cage. You block the electromagnetic field.”