Your mom can treat keypair as just another password thing. With the nice exception that she would never have to type it, just click on "sign in as (name)" butto

Your mom can treat keypair as just another password thing. With the nice exception that she would never have to type it, just click on "sign in as (name)" button and browser/GPG agent combo would do the rest. I'd note there are tons of solutions involving key escrow, so synchronization and recovery are not problems.