How Could A Diffie Hellman Key Exchange Work on SMS Android Apps on Two Different Mobile Devices? It is understandable for a client browser communicating with a server, the internet data path is continous unlike SMS that is relayed via GSM network.
Yes, that's possible . Why not?
Diffie-Hellman only demands you exchange data. There's no restriction on how that data gets from A to B. You might use the internet, SMS, pidgeons, shout it across the marketplace, morse it, use skybeamers to write it into the night sky…
How you encode the couple of bits into SMS, letters attached to pidgeons, buzzwords shouted across the market place, letters morsed, or skybeamer figures is up to you. In the end, Diffie-Hellmann just requires you to send a few numbers around.