On 17 Oct 2018, at 17:39, Grant Taylor via cctalk
<cctalk at classiccmp.org> 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.