3 ms·
qkd solves no problem that quantum computers generate. At best you could replace a symmetric cipher with it (though huge costs and very impractical), but we don
by hannob 11y ago
qkd solves no problem that quantum computers generate.
At best you could replace a symmetric cipher with it (though huge costs and very impractical), but we don't have a problem with symmetric ciphers.
- sgt101 11y agoWe have a problem distributing the keys for symmetric ciphers, which is why qkd would be useful if we can't do pki. I'm interested in the huge costs and very impractical part of your comment - why do you think that?
- hannob 11y agoYou can only use qkd if you already have a shared key. If you already have that you can also use that to distribute your keys. Impractical and expensive because: * You need a glas fiber line. That means no copper, no wifi, no crypto on mobile phones. * You are limited to some tens to hundreds of kilometers. No transatlantic encrypted qkd. It doesn't work. * Complex physical tasks with high accuracy like sending and detecting single photons - not cheap.