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 ?
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” [email protected]
To: [email protected]
Sent: Tuesday, June 19, 2012 16:47
Subject: [Discuss-gnuradio] descrambling radio waves
On Tue, Jun 19, 2012 at 10:01 AM, Patrik T. [email protected]
wrote:
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.
Thanks. How is the “KEY” exchange done ?
Descrambling doesn’t necessarily mean hacking for malicious purposes,
it can also mean learning existing systems to design better/more
efficient ones for the future. Thanks for your opinion.
Most likely it is a 64bit PIN Seed that your key will contain.
If you do not know it then data was not ment for “your eyes”.
Descrambling doesn’t necessarily mean hacking for malicious purposes,
it can also mean learning existing systems to design better/more
efficient ones for the future.
If you don’t know the key then you are in the wrong group.
All the best,
Patrik
----- Original Message -----
From: “Vikas N Kumar” [email protected]
To: “Patrik T.” [email protected]
Cc: [email protected]
Sent: Tuesday, June 19, 2012 17:21
Subject: Re: [Discuss-gnuradio] descrambling radio waves
On Tue, Jun 19, 2012 at 11:13 AM, Martin B. (CEL) [email protected] wrote:
can we transmit and receive at the same time in the same application
using the same hardware ?
This question has a lot of caveats. I’ll assume you know what you’re
doing (and what you can realistically expect), and then the answer is
yes, GNU Radio can do that.
I agree my question is unclear. I want to know if one can write a
single program using gnuradio-companion that can perform both
transmission and reception using the same hardware, or if such program
already exists. So instead of having a full fledged HAM radio
equipment with a transceiver etc, I want to experiment with GNU Radio
and cheaper hardware. I only have used RTL2838U chip based dongles and
have no transmission hardware yet. I have to purchase it and am
evaluating which one to pick that can perform maximum tasks. USRP is
expensive for my budget right now.
On Tue, Jun 19, 2012 at 09:47:49AM -0400, Vikas N Kumar wrote:
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 ?
That’s a bit unspecific.
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 ?
Transmission is fine, works just as good as receiving. We couldn’t
transmit data between USRPs otherwise.
can we transmit and receive at the same time in the same application
using the same hardware ?
This question has a lot of caveats. I’ll assume you know what you’re
doing (and what you can realistically expect), and then the answer is
yes, GNU Radio can do that.
MB
–
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)