Re: [Discuss-gnuradio] Out of Tree Encryption block

[Marcus Müller]

Hi Dushyant,

A side note:
I'm going to go assume that with "encoder" and "decoder" you mean
Channel Coding.
You *must* do channel coding after encryption, otherwise you won't get
decryptable bits
as soon as you don't have infinite SNR. This is not optional, because
with proper
encryption a single flipped bit will damage your signal in several places.
This thread reminds me of
http://lists.gnu.org/archive/html/discuss-gnuradio/2014-04/msg00277.html
so there might a solution to your problem there; Ralph has posted some
interesting insights
back then.

Usually, you'll want to have something that applies something like a
block cipher on packetized data.
Although I'm not aware of any existing Modules that do this, using
stream tagged blocks, and the
gr-digital header demux infrastructure, you should be able to packetize
your data and encrypt the payload
en bloc, for example using AES.

Greetings,
Marcus


On 28.05.2014 15:25, dushyant.marathe wrote:
> I want to simulate a voice transmission system in GNURadio Companion (GRC).
>
> My system configuration is as follows:
>
> TRANSMITTER : Wav file source --> encoder --> encryption --> modulator -->
> RF  
>
> RECEIVER : speaker/Wav file sink <-- decoder <-- decryption <-- demodulator
> <-- RF
>
> I have simulated the above configuration in Ubuntu 12.04  machine but
> without
> encryption/decryption blocks.
>
> If you can point me to an existing OoTM of digital encryption, it would be
> nice.
>
> Thanks and Regards,  
> Dushyant
>
>
>
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