Re: Quantum Cryptography can not work

In article <45e40c49$1_3@xxxxxxxxxxxxxxx>, "ouah" <ouah@xxxxxxxx>
wrote:

Francois Grieu wrote
If I'm correctly informed, early QC systems used hypothesis that
have been proved wrong soon after, making the original system unsafe,
thus that notion of trust in physics laws is not just rethoric.

Which hypotheses? The first (and most famous) 1984 Quantum
Cryptography paper suggested a protocol (BB84) that is still
the one used among commercial QC systems. What is true
is using imperfect devices (e.g., faint laser source instead
of single-photon source) gives more strength to the
attacker and hardens the work of writing security proofs.
Another thing is QC by its nature is more subject to side
channel attacks and so constructors have to be very careful
when designing QC systems.

I was NOT refering to imperfect implementations of QC, that fail
to use true (enough) single-photon sources, which I am told
has existed in would-be commercial systems.

I was refering (without any real understanding) to something
called Breidbart Basis or Breidbart Eavesdropping that, I was
told, could break BB84 as first stated, or is it variants
of BB84 that published articles have been considering.
If someone has a reference like "Breidbart Basis vs BB84 for
dummies", I'd appreciate that.


François Grieu
.