On 03 Dec 2017, at 19:02, John Clark wrote:
On Sun, Dec 3, 2017 at 9:23 AM, Bruno Marchal <marc...@ulb.ac.be>
wrote:
> Bitcoin, and digital money, will need quantum encryption.
There are quantum encryption protocols that even a
quantum computer couldn't break, they would be as secure as the laws
of physics themselves, but unfortunately there are severe practical
problems; they're slow and they would require new hardware. You'd
have to rebuild the entire Internet from the ground up, and the
fibre optic lines that we use now probably wouldn't work at
distances of more than a few hundred miles, for long distances you'd
probably need to use LASER communication satellites and hope for a
cloud free day at both ends.
I will answer this when it stops raining!
Seriously, I think that quantum encryption might be feasible at the
time when quantum computer can break the code. That will still take
time. But you are right, quantum encryption will need a lot of work to
be practical, but that is about the same for a quantum computer
capable to break a code. There might be a short hole in the timing.
Yes, that is plausible, but it will not last long.
Bruno
John K Clark
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