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26th Chaos Communication Congress: How you can build an eavesdropper for a quantum cryptosystem

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Jan Panteltje

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Dec 31, 2009, 11:09:04 AM12/31/09
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26th Chaos Communication Congress: How you can build an eavesdropper for a quantum cryptosystem
http://events.ccc.de/congress/2009/Fahrplan/events/3576.en.html

Related article in German:
http://www.heise.de/newsticker/meldung/26C3-Forscher-demonstrieren-genialen-Quanten-Hack-894136.html

unruh

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Dec 31, 2009, 2:26:07 PM12/31/09
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On 2009-12-31, Jan Panteltje <pNaonSt...@yahoo.com> wrote:
> 26th Chaos Communication Congress: How you can build an eavesdropper for a quantum cryptosystem
> http://events.ccc.de/congress/2009/Fahrplan/events/3576.en.html

Well, not quite right. It is not (only) eavesdropping. It is also
controlling the receiver ("blinding" the receiving photodiode and
forcing it to click. ) Ie, it is using a "bug" in the operation of the
receiving photodiode.

Mok-Kong Shen

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Jan 1, 2010, 5:14:10 AM1/1/10
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unruh wrote:

> Jan Panteltje wrote:
>> 26th Chaos Communication Congress: How you can build an eavesdropper for a quantum cryptosystem
>> http://events.ccc.de/congress/2009/Fahrplan/events/3576.en.html
>
> Well, not quite right. It is not (only) eavesdropping. It is also
> controlling the receiver ("blinding" the receiving photodiode and
> forcing it to click. ) Ie, it is using a "bug" in the operation of the
> receiving photodiode.

Could you please say whether it is possible in practice to eliminate
that "bug" or it is rather a permanent weakness of the quantum crypto?

M. K. Shen

Mok-Kong Shen

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Jan 1, 2010, 11:44:59 AM1/1/10
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By coincidence there is a news about quantum computer:

http://www.sciencenews.org/view/generic/id/49951/title/First_programmable_quantum_computer_created

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