Apparently there already is. It's called Pair Locking, and it's something you can do with Apple's Configurator software. Forensic data dumpers use the same func

Apparently there already is. It's called Pair Locking, and it's something you can do with Apple's Configurator software. Forensic data dumpers use the same functionality that iTunes uses to talk to the phone, which uses a process called "pairing", and Pair Locking makes it so the device refuses to establish any new pairs.