"dott.Piergiorgio" <
chied...@ask.me> wrote in message
news:uImyq.100995$GZ3....@tornado.fastwebnet.it...
>> Army Buyers to Industry: Don’t Bring Us ‘Shiny Objects’:
>>
>>
http://www.nationaldefensemagazine.org/blog/Lists/Posts/Post.aspx?List=7c996cd7-cbb4-4018-baf8-8825eada7aa2&ID=592
>
> well, reading the article, I think that the best course is Army asking NSA
> on the best computing performance needed for $CRYPTO, and asking clearly
> no more shining bell above the NSA-suggested performance.
>
> of course, the high-security code (computing sense, that is, programming)
> is done by NSA (whose seems by far the most serious of the various US
> mil/Intel establishments)
>
> all that, of course, on the basis that on-field tac crypto is aimed at
> denying intelligence for the time needed for accomplishing the mission.
>
> Best regards from Italy,
> dott. Piergiorgio.
Batteries are a bigger problem than crypto.
We have only recently become able to send and receive fault-tolerant
video-capable bandwidth with a portable battery-powered device. Cell phones
depend on strong links to tall nearby antennas and HDTV requires high power
transmitters and suffers from terrain effects. I've had to raise my TV
antenna over 15 meters high to receive all local stations. Wide bandwidth
isn't available in the lower HF frequencies that hills don't block.
We amateur radio operators have had global radio communication from almost
anywhere for a very long time but at a low voice or code data rate and
usually with a portable generator.
http://en.wikipedia.org/wiki/Field_Day_(amateur_radio)
http://www.spacetoday.org/Satellites/Hamsats/HamsatsBasics.html
http://en.wikipedia.org/wiki/Slow-scan_television
http://www.af.mil/information/factsheets/factsheet.asp?id=118
The Sprint wireless modem on my laptop has a higher theoretical bandwidth,
as long as I'm within sniper range of the cell tower. The link loss to those
satellites is around 150 to 200dB, meaning the ground transmitter needs
power roughly comparable to a battery-powered drill or floodlight.
http://www.tutorialsweb.com/satcom/link-power-budget/uplink-path-loss.htm#one
Vulnerable and not so secure, but available:
http://en.wikipedia.org/wiki/Iridium_satellite_constellation
AQ can sometimes tune into drone feeds that pass over the commercial links
that supplement the inadequate capacity of secure military channels.
jsw