With acoustic access, attacking the human directly is more advantageous. You can log the sound of every key press and differentiate between them. Then solve the

With acoustic access, attacking the human directly is more advantageous. You can log the sound of every key press and differentiate between them. Then solve the resultant primitive substitution cipher - each key will have a distinct sound signature, solve the mapping. Don't need physical access to the keyboard at any point. Example: <https://github.com/shoyo/acoustic-keylogger https://github.com/shoyo/acoustic-keylogger>