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Revealed: car industry was warned keyless vehicles vulnerable to theft a decade ago
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I have a key fob faraday cage/pouch keychain to prevent people from being able to dupe my key fob's signal.
Seems like keyfobs need an on/off switch for signal broadcasting.
Honestly this is a great idea. You could likely even make one yourself with a couple wires, a switch and a piece of tape.