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Re: [Discuss-gnuradio] descrambling radio waves


From: Patrik Tast
Subject: Re: [Discuss-gnuradio] descrambling radio waves
Date: Tue, 19 Jun 2012 17:31:41 +0300

Sample CCSDS frames that were crypted (not ment for my eyes)
http://www.poes-weather.com/~aptdecoder/martin/Meteosat9--LRIT/2011-11-17-meteosat9--cadu.txt

P

----- Original Message ----- From: "Patrik Tast" <address@hidden>
To: "Vikas N Kumar" <address@hidden>; <address@hidden>
Sent: Tuesday, June 19, 2012 17:01
Subject: Re: [Discuss-gnuradio] descrambling radio waves


Hi Vikas,

If the signal is crypted then it was not ment for you unless you have a KEY to "unlock". In CCSDS (digital reception) frame header there is a bit telling you if data is/not crypted. It also contains the key number that you have to use to descramble it.

GNU Radio does not support hacking, it is up to you if you want to do/try and embarres yourself

Be honest and forget that (stuped) idea,
Patrik

----- Original Message ----- From: "Vikas N Kumar" <address@hidden>
To: <address@hidden>
Sent: Tuesday, June 19, 2012 16:47
Subject: [Discuss-gnuradio] descrambling radio waves


Hi

I am researching methods/algorithms to perform descrambling of
scrambled radio waves as part of a research project.

- I was hoping to find out if anyone here knows about or has resources
where GNU radio is being used for doing such things. If yes, what
algorithms are possibly used to scramble the content ? Do the
algorithms depend on the hardware or since this is SDR it doesn't
matter ?

- i have used GNU radio successfully to receive FM waves and listen to
music. however, while trying to transmit I am not having much success
and have not found much documentation on that. Does anyone
successfully transmit using GNU radio or are they using separate
software ?

- can we transmit and receive at the same time in the same application
using the same hardware ?

Thanks
Vikas
--
http://www.vikaskumar.org/

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