A typewriter is likely even more susceptible than a computer keyboard to a listening attack: https://freedom-to-tinker.com/2005/09/09/acoustic-snooping-typed-i

A typewriter is likely even more susceptible than a computer keyboard to a listening attack: https://freedom-to-tinker.com/2005/09/09/acoustic-snooping-typed-information/ https://freedom-to-tinker.com/2005/09/09/acoustic-snooping-t... Has anyone applied similar methods to pen on paper?