A new study published by a number of British researchers reveals a hypothetical cyberattack in which a hacker could leverage recorded audio of a person typing to steal their personal data. The attack uses a home-made deep-learning-based algorithm that can acoustically analyze keystroke noises and automatically decode what that person is typing. The research showed that typing could be accurately de-coded in this fashion 95 percent of the time.
So yes if you're recording videos for YouTube, are in a Zoom call, etc and are busy typing your password in, just blurring the video is no longer sufficient. It's true too, that sound penetrates though walls, and does not need any direct line of sight either. I suppose you could start to randomly hit the shift key, while typing in passwords, to try throw off any analysis. Also using a password manager to auto-fill fields will eliminate this.
See
https://gizmodo.com/ai-acoustic-cyberattack-deep-learning-hackers-1850714550#
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