Scrambling or hashing the VIN wouldn&#x27;t fix the problem. The VIN is public knowledge (literally printed on the car in plain sight), and the scrambling&#x2F;hashing procedure would also have to be public knowledge since you&#x27;re literally putting it into the hands of users.<p>What you need is some kind of actual secret token. For example, the car could generate a random value which you put into the app to link them. Or Nissan could track who owns what car, require a regular login&#x2F;password to use the app (if they don&#x27;t already), and only allow the account linked to the car to control that car.