8 ms·
I believe the retransmitted quantum packet would be necessarily different from the original. So the receiving node notices that the packet has been modified, bu
by jterce 13y ago
I believe the retransmitted quantum packet would be necessarily different from the original. So the receiving node notices that the packet has been modified, but because it expects the (secure) hub to modify the original, all is well.
- jstanley 13y agoBut how can it tell the difference between the hub's modifications and an attacker's modifications?
- querulous 13y agoit can't, that's why you need a trusted hub clients can only tell that the message they received from the hub was actually from the hub and was not observed by anyone but the hub. there's no way to tell a message from client A to client B wasn't tampered with or observed before the hub delivered it
- r00fus 13y agoSo if you're supposed to trust all hops on your message, quantum cryptography has no real appreciable improvement over standard digital communications (where the same problem exists).
- tjoff 13y agoWell, you don't have to worry about anyone hijacking a cable. Rather big improvement there. Although not without cost...