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 >
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