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Hacking Through Sound: The New Threat to Online Security Leave a comment


In an era where cybersecurity threats continuously evolve, a novel hacking technique has emerged that doesn’t rely on infiltrating your system through conventional means. Instead, it listens to your keyboard strokes and, astoundingly, can decode your typing with shocking accuracy.

A group of researchers recently demonstrated (“A Practical Deep Learning-Based Acoustic Side
Channel Attack on Keyboards” PDF paper) that a neural network listening to keyboard typing sounds could discern the text being typed with an astonishing 95% accuracy. This method requires a microphone to be relatively near the keyboard for higher-quality sound recording. In practice, if a hacker were to gain control of a device’s webcam microphone, they could potentially use this technique for data extraction.

What’s even more concerning is the fact that the technique is not limited to direct recordings. The researchers showed that even through a Zoom call, the method could decode keyboard sounds with an accuracy of 93%. This suggests that the threat vector extends beyond compromised devices in our current climate of virtual meetings and remote work.

However, there is a slight silver lining. The quality of the recording plays a significant role in the accuracy of the data extraction. As expected, a lower recording quality results in reduced accuracy.

The Implications

This breakthrough in hacking techniques poses risks equivalent to conventional keylogging methods, where every keystroke is logged and potentially used for malicious purposes. The potential for spying, identity theft, and data leaks has just been amplified, presenting a new challenge for cybersecurity experts.

The researchers trained the neural network using a MacBook Pro to accomplish this feat. For training data, each key on the keyboard was pressed 25 times, which is not that much. The recorded sounds from these keystrokes served as the foundation to teach artificial intelligence how each key sounded. Once the recordings were obtained, signals were processed to isolate each keystroke, which was then analyzed.

Defending Against the Acoustic Threat

While this hacking method sounds daunting, there are defenses against such eavesdropping. Here are a few strategies:

Quiet Keyboards: Switching to a more silent keyboard can reduce the distinctiveness of each keystroke, making it harder for the neural network to identify each sound. Would it mean mechanical keyboards are more at risk? Probably.

Generate Fake Keystrokes: Intentionally creating deceptive keystroke noises can mislead the neural network, causing it to interpret keystrokes inaccurately. However, that would get annoying real fast.

Virtual Keyboards: Using an on-screen or virtual keyboard can be an effective countermeasure for critical data as they don’t produce physical sound when typed on. OK for passwords, but not ordinary text and chat conversations.

Two-Factor Authentication (2FA): Even if a password is compromised through this technique, 2FA provides an additional layer of security, ensuring that hackers need more than just a password to gain access.


The discovery of this hacking technique based on listening to keyboard strokes serves as a reminder of the continuous evolution of cybersecurity threats. As technology advances, so too do the methods hackers employ. It is paramount that, as users, we stay informed, adapt, and prioritize our digital safety. The future of cybersecurity will be about guarding against digital infiltrations and protecting the very sounds we make. Sounds tiring…

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