The problem with technology strong enough for crypto-geeks is, only crypto-geeks will want to use it.  I complained about this before, here.  In response I got introduced to keybase.io… which is not the answer to this problem for your mom. Just look at it.

I guess I should be signing stuff, but I've never been sure what to sign. Maybe if I post my private key, I can crowdsource my decisions about what to sign.

xkcd for 2015-07-20

mouseover text: I guess I should be signing stuff, but I’ve never been sure what to sign. Maybe if I post my private key, I can crowdsource my decisions about what to sign.