Although it is not easily picked up by our ear, it can be exploited by an algorithm. The fact that keys make a somewhat unique sound is a vulnerability. For audio, because keyboards are mechanical devices, each key may create a slightly different sound due to various manufacturing considerations. EM is split into voluntary emissions from wireless keyboards for instance (but those are often encrypted) and involuntary EMI. It can be an alternate, simpler, attack medium for eavesdroppers.Īt a distance, there are two main passive ways to pick up some information from the hardware without a direct line of sight: electromagnetic waves and sound. However, the hardware may give significant cues. Credential security is often viewed from the software perspective: encryption algorithms, hashing robustness to brute-forcing, etc.
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