So PGP and the encryption protocol of Threema aren't proper encryption protocols? Then, how do you break the key? Brute force? If you break one key that way,

So PGP and the encryption protocol of Threema aren't proper encryption protocols? Then, how do you break the key? Brute force? If you break one key that way, it's likely you could break equally secure keys as well. Access to the device? Well then you have access to everything anyways