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On Sat, 3 Apr 2010, solarwind wrote:

> On Sat, Apr 3, 2010 at 4:03 PM, Michael Watterson <mike@radioway.org> wro=
te:
> > However a few mW at 2.4GHz is all a =C2=A0balloon =C2=A0needs if it's a=
 HAP. At
> > 144MHz you can talk to ISS with a rubber duck hand held with a few watt=
s
> > as it passes overhead.
> >
> > Some malicious can easily jam your signal.
>=20
> I still find the "no encryption" ridiculous. So what if I talk
> normally over an amateur frequency in pig Latin? Is that considered
> encryption? What if I speak in my own made up language? Is that
> encryption? What if I'm autistic and my words don't make sense? Is
> that encryption?
>=20
> You can see the point I'm trying to make here. At what point is it
> considered encryption?
>=20
> What if I'm trying to control a a device at long range and I send it
> "commands" like this:
>=20
> 0010101010101010101010100101101010 - you get the idea.
>=20
> To the remote node, the command makes perfect sense. But someone
> listening in wont really understand what it is. Is that considered
> encryption?
>=20
> What if I add some more complexity to the protocol so acknowledgment
> is required on each command? For example, I would send a specific
> command A, and along with the command, I would send a certain
> mathematical function of A that corresponds to A. The device would
> then verify that mathematical relationship for validity (also helps to
> ensure that the command isn't corrupted for some reason). Is that
> illegal too? To send mathematical formulas/numbers over the air? In
> itself there is no "meaning" and therefore the "meaning" can't be
> obscured.
>=20
> Again, at what point does it become "encryption"?
>=20

You are so missing the obvious :-)

If you want to talk to your weather balloon and have it ignore third party=
=20
commands, JUST sign the message so that the balloon knows it really came=20
from you. Send the message in the clear and sign it. People do this all=20
the time with email.

Regards
Sergio Masci
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