GaryZ - I know you're kidding, but even that's a security risk. On some old electric typewriters, you could listen for the timing that it took between the keypress and the selectric ball to get to the paper - the difference was small, but unique enough that you could figure out what someone was typing, just by the sound.
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“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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GaryZ - I know you're kidding, but even that's a security risk. On some old electric typewriters, you could listen for the timing that it took between the keypress and the selectric ball to get to the paper - the difference was small, but unique enough that you could figure out what someone was typing, just by the sound.