h a l f b a k e r y
Not so much a thought experiment as a single neuron misfire.
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The internet is not secure enough for exchanging all types of data. A satellite could relay data more securely than the internet by beaming it directly to specified destinations using a maser. This would allow circumventing the internet for a few special purposes. This method could also be used with
laser beams in suitable situations.
For higher security, send the data beam through the center of a wider beam which is modulated with noise. This noisy beam would drown out any signal leaking from the data beam.
The intended recipient would need to receive two signals: one from the central (data) beam, and one from the outer (noisy) beam. The receiver would then subtract the noise signal from the noise-plus-data signal to restore the pure data.
Transmission using coaxial beams is done to reduce the ease of tapping the data beam by causing particles to float through its path to partially reflect it for monitoring.
They've already rooted our satellites.
[swimswim, Nov 21 2011]
Onyx monitors satellite communications...
[normzone, Nov 21 2011]
Replace "satellite" with "dirigible" and add some other functionality.
(and use the word "boffin" with obnoxious frequency) [swimswim, Nov 22 2011]
||I doubt this is very secure although i can't back that
up - it's just a hunch. I think just using radio and
some kind of local key might be better, but to be
honest my main concern is the masses of cabling
between me and everyone else, not security as such.
||The internet is perfectly secure if you use hand delivered one time pads for your cypher.
||If you are enough of a big shot, you can buy leased
lines from telecoms. They're paths of fiber optic
from one business to another for your exclusive
||Satellite communications, are much like wifi or your
cellphone provider rely on encryption for security,
which is known to be cracked. more importantly it
easier to eavesdrop on sate light signals than it is to
splice into a cable.
||This is easy to hack, all I need is a RC blimp or UAV
plane and fly it into the data stream above the
||// If you are enough of a big shot, you can buy
leased lines from telecoms. They're paths of fiber
optic from one business to another for your
Yes you can lease private MPLS clouds or point to
point T1s or Ethernet.
If you want to go cheaper you can just FTP files
sent encrypted multiple times under a series of
different encryption schemes with different 256-
bit passwords making decryption beyond the reach
of anything short of theoretical quantum
||If the data is sent in a narrow enough maser beam, it should be reasonably difficult to intercept data by aircraft at least. An intruder would need to get to the path of an anticipated beam and wait for a transmission, while using a partial reflector to collect some of the signal.
The method wouldn't be perfect, but it should provide fewer opportunities for intruders than the internet. In any case, it certainly wouldn't be very secure if used with our existing, insecure satellites.
The reason for describing it as for "occasional" use, is so that many people can use it and spread out the cost of the investment.