Newbee wants to kick start - second try
ramsesoriginal at gmail.com
Sat Apr 26 03:01:48 CEST 2008
If it's like that, then a simple amplitude-modulation over a
pre-recorded, fixed, carrier of the encrypted data should be no
problem, since amplitudes are sent...
On Sat, Apr 26, 2008 at 12:09 AM, Flemming Richter Mikkelsen
<quatrox at gmail.com> wrote:
> On 4/24/08, ramsesoriginal <ramsesoriginal at gmail.com> wrote:
> > On Thu, Apr 24, 2008 at 2:47 PM, Adilson Oliveira
> > > - - I've being reading about a project to implement cryptography on
> > > Openmoko so the calls and text messages can be secured, unfortunately I
> > > forgot the name of the project but I've heard that voice calls can't be
> > > secured like that due limitations on the way GSM work. Is this correct?
> > As far as I understood it, a GSoC-Project is a sms middleware, which
> > should (theoretically) implement a way to simply encrypt with gpg the
> > sms. Phone calls can't be encrypted that easilly because, as far as i
> > understood it, the microphone is connected directly to the gsm chip.
> > But we have many intelligent people here, so someone will probably
> > find a way to do even that.
> The microphone is connected to the sound card:)
> The reason that encrypted calls over GSM is so difficult, is that the GSM
> chip samples and encode the input from the microphone. This coding
> is optimized for speach only and does not actually send your speach
> over the network, but it breakes the sound up in small parts and
> use a lookup table to find something that is more or less similar.
> It then sends the table index over the network. The actual sound is never
> sent, not even in digital form. This is at least how I remember it
> Please don't send me Word or PowerPoint attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
> Join the FSF as an Associate Member at:
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