Newbee wants to kick start - encrypted calls

[Kevin]

Could it be possible to make tones with "Make your own Mein Fraulein
station" kit to use for encryption?
http://www.homelandstupidity.us/2006/08/05/phone-numbers-stations-mystery-revealed-at-defcon/

On Thu, Apr 24, 2008 at 4:30 PM, Ian Stirling <OpenMoko at mauve.plus.com> wrote:
> Crane, Matthew wrote:
>>
>> Not sure if there's a specific project, I'm hoping to do some sort of
>> "analog" encryption, with audio effects and inverse effects, such that
>> it does not need to be digitally decoded, where the excellent pattern
>> recognition engine in the brain does most of the work.
>>
>
> You can't do much.
> It has to 'sound' voice-like to the multiple codecs in the signal chain of a
> GSM call, or the codec just discards the sound.
>
> Listen to a voice over a good GSM line.
> It's quite well reproduced.
>
> Now, listen to an assortment of music.
> Some will come out quite well, and be reproduced much like they came out.
> Some are utterly shredded.
>
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