this post was submitted on 01 Jan 2024
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It is possible to extract encryption keys by recording coil whine with a phone next to the computer (2013 paper) (web.archive.org)
submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]
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A more TLDR article about this: https://www.extremetech.com/defense/173108-researchers-crack-the-worlds-toughest-encryption-by-listening-to-the-tiny-sounds-made-by-your-computers-cpu

FAQs from the researchers: https://web.archive.org/web/20230130225254/http://www.cs.tau.ac.il/~tromer/acoustic/

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[–] [email protected] 5 points 11 months ago

According to the FAQ:

The key extraction attacks finds the secret key bits one by one, sequentially. For each bit, the attacker crafts a ciphertext of a special form, that makes the acoustic leakage depend specifically on the value of that bit. The attacker then triggers decryption of that chosen ciphertext, records the resulting sound, and analyzes it.

Which sounds to me like the latter?