[plif]

Not just email / text comms -- it's not hard to fake voice and video now either. Maybe PGP in its current form is too complex for your mother, but that is one of the reasons her generation needs it the most.

I agree that it's a no brainer in a professional context, however I can see there being a ton of value in having a simple / cross-platform / cross-medium personal signing mechanism as well. It's something that we could have used yesterday.