Any system with a backdoor can be exploited. Keep a large number of spare keys that are revokable instead. Given my "threat model", I don't need a lot of secur

Any system with a backdoor can be exploited. Keep a large number of spare keys that are revokable instead. Given my "threat model", I don't need a lot of security, so that's one on my person, two other places that are in tamper evident containers.