A friend of mine purchased a new vehicle. Unlike vehicles in the past, this vehicle does not require you to insert a key to open the doors or run the car. The key merely must be within a couple feet of the car and the doors unlock and the engine can be started by pushing a button without needing the key physically.
This presents and obvious security problem. For example, getting something out of the trunk. Since my friend would be close to the vehicle, the doors are unlocked and someone could simply enter the unlocked vehicle and start the car.
According to my friend, this remote works off of some sort of radio wave mechanisms. My friend thinks the best way to resolve this problem would be to purchase a case for the “key”/remote so that, as long as the case is on it, no signal can be sent to the car and thus problem avoided.
Are there any good known solutions to this problem? If putting a case on the key is the best solution, what are the ideal characteristic in such a case? I don't really know what my friend needs.