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Re: What is the oldest computer that could be used today for real work? [message #411335 is a reply to message #411278] Tue, 28 September 2021 09:11 Go to previous messageGo to previous message
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On Sat, 25 Sep 2021 22:21:51 +0100, Ahem A Rivet's Shot <steveo@eircom.net>
wrote:
> On Sat, 25 Sep 2021 15:56:30 -0400
> J. Clarke <jclarke.873638@gmail.com> wrote:
>> Why would they not be? There are 100 orbital launches or so a year.
>> It would take that many to knock down all the satnav satellites. And
>> there aren't very many orbital launch facilities in the
>> world--furthermore none of them are hardened.
>
> This and the possibility that there is a separate constellation for
> military use with an authenticated and encrypted protocol and hardened
> satellites. It would be easy enough to do and hide and an elementary common
> sense precaution and it's really hard to steal a private key if the only
> copy is on a satellite.

Easy to do -- perhaps. Easy to hide? No. There are bird watchers, train
spotters, and similarly, people who track satellites. They have the orbital
characteristics for known commercial and military satellites, and watch for
them. So-called "black" satellites tend to stand out because when they are
observed from the ground, their orbits don't match any satellites that people
are claiming credit for.
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