Re: Just write it down
It's a bit old fashioned but how about a typewriter? I found my 35 year old portable in the attic recently and my children are having fun working out how it works (they seem to find it strange that it doesn't have a mouse).
I'd like to see anyone hack the typewriter. Well apart from listening in and trying to decode the audio, KGB style, but I think that that's out of the league of your average script kiddie.