[time-nuts] Ships fooled in GPS spoofing attack suggest Russian cyberweapon

paul swed paulswedb at gmail.com
Mon Aug 14 13:43:24 EDT 2017

Sextent, compass, and clock.
Amazingly as posted on time nuts some time ago the Navy and Coast Guard
have re-introduced that training.

On Mon, Aug 14, 2017 at 1:24 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> Hi Jim,
> On 08/14/2017 06:03 PM, jimlux wrote:
>> And GPS users who care about spoofing tend to use antenna systems that
>> will reject signals coming from the "wrong" direction.  It's pretty easy to
>> set up 3 antenna separated by 30 cm or so and tell what direction the
>> signal from each S/V is coming from.
>> I would expect that as spoofing/jamming becomes more of a problem (e.g.
>> all those Amazon delivery drones operating in a RF dense environment) this
>> will become sort of standard practice.
>> So now your spoofing becomes much more complex, because the sources have
>> to appear to come from the right place in the sky.  (fleets of UAVs?)
> You gain maybe 10 to 20 dB, but not much more.
> A real protection scheme needs much more tolerance to handle severe
> problems.
> There is an overbeliefe in such approaches, rather than trying to look at
> the system analysis, since when you loose the GPS signal, what do you do. I
> get blank stares all too often when I ask that trick question.
> Cheers,
> Magnus
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