Encrypted calls - Cryptophone.de protocol

schmitz_dirk at email.de schmitz_dirk at email.de
Sat Aug 23 15:20:54 CEST 2008


Hello Sören,

I hope this email will be delivered to you and also the community?! 
I only follow the mailinlists, but it's the first time to ask and send a email. 
Sorry if I made a technical mistake.
So, my question is: What do you mean with "I'm (will be)
using HCD (GSM data connections) to deliver encrypted voice data."
Do you mean GPRS, so i need a data plan? Sorry for this maybe simple or stupid question.

Many Thanks in advance!

best regards

Dirk


-----Ursprüngliche Nachricht-----
Von: "sh" <soeren at heisrath.org>
Gesendet: 23.08.08 00:36:31
An: Mikko Rauhala <mjrauhal at cc.helsinki.fi>
CC: devel at lists.openmoko.org
Betreff: Re: Encrypted calls - Cryptophone.de protocol

Hi Mikko!

I'm currently creating the application you've described. I'm (will be)
using HCD (GSM data connections) to deliver encrypted voice data.

I've tried using pulseaudio on the Neo 1973 (haven't got a freerunner)
It turns out it is way too slow. At the moment, I'm using portaudio
because that one is way better documented than alsa (at least for the
full-duplex part).

At the current stage, I can compress the audio data coming from the
microphone with speex, decompress it and the play it back to the
speakers/headphone.

In the weeks to come I'll add AES for encryption and see how to pipe
that data stream through the modem. When it is at the stage where I can
create a stable connection with pre-shared keys, I'll release the first
version to the public.

It will be licensed under the GPL, but at the moment I really need
to make it stable, optimize it and run a few tests before I'll release
it ;-)

Future plans include compatibility with the cryptophone protocol and the
option to use a PKI for session key exchange.

Sincerely
- Soeren

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