Deb, any reputable dealer would require proof of ownership along with the VIN. So you don't need to worry about covering your VIN. Plus, most thieves aren't able to see the potential return on the investment of $150 for a key and the time and trouble to fool a dealership letting them take a $25,000 car. They're usually of the mind that a brick (free) through the window of the car next to your Crossfire is a lot easier.

As for reprogramming keys, no once a key is synched with a car, it can't be reprogrammed for a different car. The dealerships can do it, but they need a very expensive piece of equipment to do it. Most won't pony-up the cash, and just tell you to pay $150 for a new key.