[Reposting because my previous reply to this message was set to the
wrong From address.]
On 17/10/2018 17:39, Grant Taylor via cctalk wrote:
  Remember that it is possible to spoof or hijack SMS /
phone numbers.? So
 don't rely on just that for security. 
Good point.  As far as I can tell, there's no way of securing
communications with a purely SMS-based approach.
Maybe voice fingerprinting and authentication for each request..?  I can
already smell feature creep.
--
OpenPGP key: EB28 0338 28B7 19DA DAB0  B193 D21D 996E 883B E5B9