Re: [amsat-bb] Question about AO-40 telemetry

[Claudio Martins <ctpm@xxxxxxxxxxxxxxx>]

  Hi Stacey and all,

  First I would like to clarify my question. As some other people already 
refered on the list, I was not asking for specific info on keys or 
frequencies but for a general hint pertaining the nature of the mechanism 
used on AMSAT Satellites for authentication.

  One is not able crack a system by having only a slight idea of its 
workings, unless the system relies on security by obscurity.

 The reason I'm asking is that for sometime I was part of one of the teams on 
an ESA student project (project is called SSETI) to build a Microsat. The 
role of my team was to set up a command station. At that time I wondered how 
we would do authentication between the command station and satellite. 
Unfortunately due to personal reasons I had to abandon the project, so I 
never got to know the answer to that, and it is rather difficult to find any 
info on it.

  So again, I ask not for keys or frequencies, but only some very general 
info, like: is the command uplink encripted or not, or is the authentication 
password based, or other kind of method (like the IHU sends a "challenge 
question" for which the command station must give the righ answer)...

Thank you very much for your attention.
Best regards

73 

Claudio Martins
CT3KD

On Friday 19 April 2002 03:55, Stacey E. Mills wrote:
> >   Hi Stacey, thanks for your good explaination. By the way, I'm curious
> > about
> >a topic for which I found little info on my search: what kind of algorithm
> > is used on AO-40 for command station authentication? Is it crypto based
> > or something like that? Any pointer to info will be greatly apreciated.
> >
> >Thanks for the great work!
> >Best 73
> >
> >Claudio
> >CT3KD
>
> For hopefully obvious reasons, command-related information is not discussed
> in public.
> Virtually any other topic is fair game.
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