Am I missing something? The Engadget article Kia made a tiny Faraday cage to protect your wireless key from thieves says:
Many existing keyless entry systems aren't secure, but few people are likely to replace their cars just to reduce the chances of a determined thief making off with their ride. Kia UK has an official stopgap solution, though. It's taking a cue from third parties and releasing KiaSafe, a case that serves as a minuscule Faraday cage to block the key's wireless signals. There's nothing particularly special to it -- it's ultimately a metal-lined pouch -- but that's all might you need to prevent someone from swiping your car while you're asleep.
I'm confused in more than one way.
- I'd thought that the point of a Faraday cage for RF signals is to block RF inside from getting out and RF outside from getting in. So then you'd have to take it out of the Faraday cage to use it and then of course the usual intercept mechanisms can still take place.
- If your radiating source is positioned flat up against or even a fraction of a wavelength away from (at least a wire mesh) Faraday cage, don't you then get significant leakage anyway?