Re: Quantum cryptography tackles video

On a sunny day (Wed, 11 May 2005 12:31:25 -0400) it happened Baugh
<baconbaugh@xxxxxxxxxxx> wrote in <Grqge.3571$sV7.2740@xxxxxxxx>:

>Jan Panteltje wrote:
>> On a sunny day (Wed, 11 May 2005 03:37:45 GMT) it happened Sam Wormley
>> <swormley1@xxxxxxxxx> wrote in <d6fge.73586$c24.66093@attbi_s72>:
>>
>>
>>>Quantum cryptography tackles video
>>> http://physicsweb.org/articles/news/9/5/5/1
>>>
>>>10 May 2005
>>>
>>>Physicists at Toshiba have used quantum cryptography to transmit voice
>>
>>
>> Yes, it was discussed in sci.crypt weeks ago, and it is useless, as it
>> requires a glassfiber between receiver and transmitter, and STILL a man in
>> the middle can fake it.
>> So you need a reel of fiber, and a shovel, and a permit to open up every
>> street etc...
>>
>
>You are mistaken. The point of quantum crypt. is that should the man
>in the middle read the signal he will affect it. You can't anonymously
>tap a quantum signal.
Wrong, the way it works is that they generate a key, use OTP (one time pad),
and xor the data with it.
The key is send via the fiber, as polarized photon pairs, so if A measures
one polarization, B must have the other.
HOWEVER one can buy these units commercially, cut the fiber, decode, fix the
data, then re-encode (generate a new pair of photons).
The ONLY thing protecting you against that attack is a strict protocol, NOT
the quantum stuff.
Look it up, sci.crypt, about 2 weeks ago.

.

Relevant Pages

  • Entangled Particle Holographic Optical Nanostorage
    ... Bank Transfer via Quantum Cryptography Based on ... group of Professor Anton Zeilinger, Vienna ... Abwassertechnologien GmbH and Bank Austria -Creditanstalt Today, ... In quantum cryptography, a data key for encoding messages is created ...
    (sci.crypt)
  • Re: interesting article on quantum cryptography
    ... article quantum cryptography works with photons, ... how would a quantum cryptographic scheme work ... logical operations involved in implementing the crypto algorithm. ... Photons are used in implementations because they are much easier to ...
    (sci.crypt)
  • Re: Crypto Mini-FAQ
    ... except that quantum cryptography needs a quantum ... Quantum cryptography merely exploits quantum coherence ... How do you make a repeater or router without a quantum computer? ...
    (sci.crypt)
  • =?ISO-8859-1?Q?Re=3A_Suche_Vortrag_von_Stephanie_Wehne?= =?ISO-8859-1?Q?r=3A_Quanten
    ... |> An informal introduction to quantum computing and quantum cryptography in particular. ...
    (de.org.ccc)