Voice Encrytion via Flash patch possible?

[MatrixCoder]

I've never seen any schematics from any mobile. Is the mic input running through the cpu or is it transfered directly with a/d to the GSM chipset?

If it's going through the cpu, do you think encrption could be possible by flash patching?

[DavieB]

Please read up some more about GSM systems.

Voice is already encrypted - as is all informations transmitted by the phone/base station using a public key infrastructure (or something very similar - between the mobile and gsm system that is)

Only old analogue phones do not encrypt voice comms!

To isolate a single signal within the GSM network system at the providers end would require the system to be disrupted unless the specific system was designed to allow such evesdropping (ilegally, of course, which would trigger an investigation by human rights organisations and by the communications regulatory bodies)

As for patching the flash - read back a few threads on that one also...
Implementing ANY new features into the flash would would require a very good understanding of the phones electronic layout and chipset/cpu routines!
Implementing secure encryption algo's would be totally out of the question (at this point in time anyway ... there's still way too much we dont know!)


Rgds

[MatrixCoder]

Originally posted by DavieB
Please read up some more about GSM systems.


I'll going to read it if there is a possible chance :)

>>Voice is already encrypted

I Know, with A5, but the hacks are already out there and the lawful interception initiative (e.g. ETSI Initiative at european community) shows that's possible to sniff the traffic.

>>Only old analogue phones do not encrypt voice comms!
What do you mean by "encryption", do you think DECT e.g. is really encryption lol.

Interception is done by e.g. the equipment of Rhode&Schwarz the so called IMSI Catcher will intercept all phone calls in a cell. It will replace the regulary cell by itself.

>>As for patching the flash - read back a few threads on that one also...
Implementing ANY new features into the flash would would require a very good understanding of the phones electronic layout and chipset/cpu routines!

I know, but if it's only possible to change fancy things like smilys and bell tones I'm not interested in, and spare my time.

[B]Implementing secure encryption algo's would be totally out of the question [B]
Yes, but it's not to hard to get better algos running than A5

regards and thans for answere

[DavieB]

Lol - I suppose you make a good case, and for that I offer my apologies!
Apparently I underestimated and prejudged you - thinking you were one of the many "less well informed" members who post questions without thinking!

I do still think tho - that it's unatainable!

However - you could...
Use the phone as a modem for a palmtop, handheld, or laptop equipt with PGPFone software. Naturally, only users with the same software could answer secure calls!

But, it IS secure and does work - I used to use the system with my old computer to talk to friends!
It was enough to stop someone in another room picking up the line anyway :D

Rgds

[ALMOGAVER]

Sorry to disappoint you guys, but this is not so.

I already used encrypted voice handsets back in 1998 (when I was a cop).

We had 4 MOTOROLA StartTAC's (I don't know why this model), but they were encrypted voice handsets, whith the down side thought, that you could only stablish "understandable" calls amongst those 4 handsets.