@user1 is asking for alternative ideas of securing a stored file
Not really close to ‘suitable for everyday business’ or sharing it with your friend at the other side of earth
I’m giving ideas, letting @user1 the judge of if it’s a good fit or not
You are telling what not to use because it doesn’t fit your view
why won’t you let people do, or experiment what they could ? odd thing to do when people ask for new ideas
But anyway, seems to me, @dcz has the best answer here for @user1