| From: | me@******.net (Hexren) |
|---|---|
| Subject: | [OT] Data Jack/Cyber Deck Question |
| Date: | Wed, 16 Apr 2003 01:52:54 +0200 |
>> Wow this gets really complex and expensive. In this case the runners would
>> have to arrange for some down time at the transmitter. Then they would have
>> to put a feed through tap in the line while maintaining the vacuum seal (not
>> impossible but difficult). With the feed through they could sample the
>> photon pulses to break the encryption. Inputting there own data into the
>> stream would require another tap which could not be in place until the
>> encryption is broken. This kind of system would be incredibly expensive. I
>> would expect to see it only in extremely restricted government installations
>> or really high level corp setups. Not something your average runner is
>> going to come across. The equipment to tap this kind of line would run
>> about $100,000.00 today let alone in 2060.
>>
>> Coyote
>>
>>
JZ> Vaccuum seals don't come into it.
JZ> Today the equipment to tap this kind of link is impossible. Not
JZ> expensive, not difficult, not complex. Impossible. Really, truly against
JZ> the laws of physics as we know them.
JZ> You can't tap the line. As soon as you interact with the data stream (ie
JZ> - observe it in any way), you change it. And you don't know what it
JZ> looked like before you interfered. The target does know what it looked
JZ> like before you interfered, because he gets told how it was generated.
JZ> Any time you look at the data, regardless what method you use, the
JZ> target will know.
JZ> In order to listen in on such a communication system, you'd need to
JZ> intercept the signal BEFORE it is coded, and if your targets have any
JZ> sense, AFTER it is decoded as well. That means you require physical
JZ> penetration of the site. That's as secure as a data connection gets.
JZ> Additionally, you don't need an optical fibre to do it. Such encrypted
JZ> streams have been done through the atmosphere to distances of 23km:
JZ> http://physicsweb.org/article/news/6/10/5/1
JZ> It IS possible that the laws of physics will be found to be incorrect,
JZ> at which point, it IS possible that this method of encryption will
JZ> become crackable. But that's a lot of 'possibles'.
---------------------------------------------
It is not unbreakable. The described method will allow 2 parties to
send keys for one time use and to know if the line has been tapped at
the time of sending. If the line has been tapped physical security
has to clear the line, after that has been done another one time key
is send. The procedure is repeated until the key is sucessfuly
transmitted and it is verified that the line was not tapped at the
sending time, after that has happend the Paydata is encypted with the
one time key. The Paydata can then be send over open channels for it is
safely encypted with the oe time key. <--- that is what I understand
of all that.
