[tschumacher]

Some post-quantum signatures like CRYSTALS-Dilithium are based on lattices. Makes me think that quantum key distribution (what I've been working on for the past 6 months) has a chance to actually become useful instead of being only of interest to academics and to a few companies that sell overpriced solutions to paranoids.

[hannob]

QKD does not solve the problem that quantum computers create, and cannot replace public key cryptography. That's a common misconception that the marketing departments of QKD research tries to keep alive.

Even under ideal conditions (whether these can exist is debatable), the best QKD gives you is a securely encrypted channel only when you already have a securely authenticated channel. The latter is extremely important, makes the whole thing mostly useless, and is often omitted by QKD advocates.

[HappyPanacea]

If you don't have an authenticated channel, you are susceptible to a MITM attack which makes any asymmetric crypto useless. Thus I think there is an implicit assumption in any asymmetric crypto that you already have an authenticated channel. Or did I miss something?

[Vecr]

Code based systems are still in, and classic McEliece could be extended to ~50 MiB for a keypair and still be way more practical than QKD. Just run the max current classic McEliece spec hybrid post quantum with X448.

[sgt101]

NSA is that you?