Hi Ricardo That's an interesting concept!
I wonder if the MMS propagation time would be an issue for using it in a PTT scheme like this? In the country I am in. It can be a matter of dozens of seconds, possibly even low minutes before MMS delivery occurs depending on network load. I am assuming they are store & forwarded by a server somewhere on the carrier's network. Still, it's a pretty neat 'outside the square' type idea :) Pete On 18/11/2015, at 2:13 AM, Ricardo Andere de Mello <[email protected]> wrote: > Hi, > > I have thought several times about a secure GSM phone, and one thing that I > paticularly dont like is the fact that GSM phones, even if connected through > audio jacks or bluetooth mics, can still operate in a non secure way. > The the GSM module firmware is usually not open, and they can in theory open > the internal mic to hear us at any time. > > So... my idea is pretty simple. why DO NOT HAVE MIC AT ALL? > If you use a GSM raw module, you dont need the mic, speaker, and all audio > stuff. > > ok... so... how to transmit the data if we dont have a mic? > > just use encrypted codec2 payloads over MMS. :) > MMS supports at minimum 300kb (enough for push-to-talk conversation) > At the same time, both ends would be encrypted, and this is the best > encryption system I can think since it is totally under your control. > > If you need some help with this, drop me a line. > > []s, Ricardo Mello > > > 2015-11-12 11:02 GMT-02:00 Nouman Khalid/A-XEN R&D/NRTC > <[email protected]>: > Hello List, > I am working on sm1000 for secure gsm phone project > just like jackpair. I initially learned to work in the LINUX environment and > built some basic codes for sm1000 and tested them. Then I built sm1000 > firmware of codec2 and tested it successfully. As far as gsm phone is > concerned, is it possible to connect sm1000 with gsm phone directly as > jackpair is doing? I am asking this because mobile phone will also use its > own codec for compression and if we apply an already compressed voice on > audio jack of mobile phone; will it be able to retrieved as encryption will > be added in FreeDV mode? Please guide me how I can make sm1000 work in full > duplex mode? > > > Thanks and Regards > Nauman Khalid > Assistant Executive Engineer > Research & Development – NRTC, Pakistan > Phone: +92-995-666-646/634 > Mobile:+92-3008098569/+923208098569 > Email : [email protected] > Web : www.nrtc.com.pk > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
smime.p7s
Description: S/MIME cryptographic signature
------------------------------------------------------------------------------
_______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
