Re: Quantum Cryptography can not work

That's my guess, too. I don't even know whether anyone has re-discovered
Adi's attacks; I don't recall seeing them in the papers on QC that
I've read. If side channel attacks on QC had been carefully studied,
then one would assume that Adi's attacks would have been re-discovered.
Then again, the papers I've read on QC probably amount to only a tiny
fraction of the literature in that field, so maybe they have been
re-discovered in some paper I'm not familiar with, for all I know.

Side channels attacks rely on implementation issues. The most of
the side channels attacks known today in QC are known since the
beginning of QC. In QC literature, side channels attacks are
often referred as "trojan horse" attacks.

The attacker shines a bright light
down the line (in the reverse direction) at the transmitter apparatus.
Some light will enter the transmitter, be reflected internally, come back
out, and on the way out it will be polarized by the polarizing filter.

This is as classical one and you have to be be careful about
the reflection of all the components even at Bob's
side (detectors side).

Another classical attack is to fire an intense burst of light
into the detectors at Bob's end that receives "1" photons.
You will fry Bob's "1" detectors, so Bob will only detect 0's.

The most famous attack is the one Francois Grieu quoted
as PNS attack (Photon Number Splitting). With current photons
sources, a fraction of pulses have more than one photon.
When there is more than one photon, the attacker takes one
photon in the pulse and stores it in a quantum memory. The attacker
then waits the end of the BB84 basis exchange. He learns the basis
used to measure the photon, applies it to his photon and learns
all the information for that photon.

ouah


.

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