True, if I'm allowed to treat the quantum crypto system as a black box mirroring the DROBOs should be considered a black box as well. But can you trust yoursel

True, if I'm allowed to treat the quantum crypto system as a black box mirroring the DROBOs should be considered a black box as well. But can you trust yourself to not take a large enough bribe? What if someone hold someone special in hostage? If you only have to convince yourself (quite limiting scenario) I see no, major, problem with your setup. This of course assuming you have eye-contact with the DROBO at all times etc. etc. Most scenarios however you can't have as much trust in the carrier as you have in yourself. But I agree. When reading quantum cryptography and its issues I often get the feeling that its all a bit silly. But I totally get the motivation about it, it's extremely enticing. However, I see why some likes to claim that quantum cryptography is just a way for physicists to get paid :P But there seems to be a market for it and I have no idea how far it can go.