Re:Quantum 'spooky action at a distance' becoming practical?
by thaumasiotes on Sunday January 07, 2018 @10:54PM
(#16094539)
Well, the whole point of encryption is that you can send your message through despite the fact that your adversary can see it.
Replacing that with a system where your adversary can't see your message, and neither can your correspondent, is a downgrade, not an upgrade.
Re:Quantum 'spooky action at a distance' becoming practical?
by mathw on Monday January 08, 2018 @03:37AM
(#16095450)
That depends entirely on your application.
Re:Quantum 'spooky action at a distance' becoming practical?
by thaumasiotes on Monday January 08, 2018 @05:21AM
(#16095814)
Could you give some examples of applications of encryption where the purpose is not to send a message that adversaries may see but cannot understand?
Edit: This kind of observation would already require physical access to the communications medium (e.g. a fiber optic cable). So if you could DoS a quantum encrypted channel by measuring it, you could equally well DoS a classical channel by just cutting the fiber.
The comment just above mine, which does a better job than me of explaining the degree of access required.
Besides which, it’s not as though you can only use this. You try your quantum channel first, and if it’s down you know you’re under attack, and act accordingly with your Classical backups.