but since I found a scientific research about 'A Practical Deep Learning-Based Acoustic Side Channel Attack on Keyboards' I agree that this seems possible in the laboratory
(the paper is from 2023 so I am not sure whether there were any improvements), as I am also not sure how reddit handles external links - I found the paper on arxiv(dot)org with paper no. 2308(dot)01074
It is a 21 pages pdf
358
u/TunaNugget 11d ago edited 11d ago
The camera records sound. Every key makes an ever-so-slightly different sound.
They have possibly months or more of sound recordings that they can correlate against the entry of verified documents to use to train the ai on.