i have a phone which is capable of detecting and alerting the user that the encryption has changed between a5/0, a5/1, a5/2. it also some some other features.

> From: alexander.chemeris@gmail.com
> Date: Sun, 31 Jan 2010 12:24:47 +0300
> To: 246tnt@gmail.com
> CC: rms@gnu.org; openbts-discuss@lists.sourceforge.net
> Subject: Re: [Openbts-discuss] "Back door in GSM"?
>
> On Sun, Jan 31, 2010 at 12:07, Sylvain Munaut <246tnt@gmail.com> wrote:
> > On Sun, Jan 31, 2010 at 9:58 AM, Alexander Chemeris
> > <alexander.chemeris@gmail.com> wrote:
> >> On Sun, Jan 31, 2010 at 00:32, Richard Stallman <rms@gnu.org> wrote:
> >>> Some of them could be corrected if your phone uses free software.
> >>> For instance, you could do some sort of encryption end-to-end
> >>> and the carrier would not have to know.
> >>
> >> You may not be able to just encode your usual voice channel,
> >> because network equipment expect it to be unencrypted and have
> >> a specific format.
> >
> > Indeed you can't just encode the voice data.
> >
> > But you could ask the network for a TCH/F in CSD data mode instead of
> > voice mode, like if you were communicating with a modem on the other
> > side. This way you have 64 kbits of bandwidth that wont be 'touched'
> > by the network and should just be delivered "as-is". David can you
> > confirm this ? My CSD knowledge may not be totally correct :)
>
> Indeed.
> My CSD knowledge is not great too, but it sounds like a good idea to use
> it. But again, network can deny to provide CSD service to you. IIRC network
> have full control who can use it and who can't. Thus if government requires
> so, carriers may turn this feature off for all usual users except few certified
> ones.
>
> With all this encryption - always keep in mind, that your called party should
> support it too.
>
> --
> Regards,
> Alexander Chemeris.
>
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