[woebtz]

What do you mean by microphone?

Is audio analysis of keyboard chatter a thing or are we leaking passwords when we verbally communicate them to a co-worker?

I don't think this is related, but I found this keylogging technique combining microphone, camera, accelerometer data to approximate finger/thumb positions for PIN numbers: http://www.cl.cam.ac.uk/~rja14/Papers/pinskimmer_spsm13.pdf

[dllthomas]

Audio analysis of keyboard chatter is a thing that had a proof of concept years ago. I have no idea how often it is done, but it is certainly plenty possible.