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add more to radio gait recognition

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blog/posts/biometrics-explained.md
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@ -182,6 +182,12 @@ Radar works by transmitting a signal and measuring how long it takes for that si
Using a continuous wave (CW) radar that's constantly emitting a signal, it's possible to measure the movements of all the different parts of your body during your gait to identify you uniquely. This is called a [micro-Doppler](https://books.google.com/books?hl=en&lr=&id=SVCQDwAAQBAJ&oi=fnd&pg=PA1&ots=cqJxAh_rPv&sig=bBz1w4h-C4nDrzNwiRvZUexKbnc#v=onepage&q&f=false) signature. These sensors can even be sensitive enough that they can pick up breathing and heartbeats of humans trapped in rubble during rescue operations.
[GaitMetrics](https://gaitmetrics.com/applications/) is a company claiming to offer mmWave gait recognition technology.
>It is also possible to identify the intruder’s unique radio gait IDs and capture them in a database. Any intruder with an unknown radio gait ID detected within the premises will trigger an alarm, and the intruder’s location will be tracked down.
They claim it can uniquely identify individuals as well as penetrate walls, a worrying combination.
## :material-chip: Secure Element
All forms of biometric authentication rely on proper hardware such as a secure element in order to be secure. The secure element provides a secure and tamper-resistant place to store your biometric data so it can't be easily extracted. Examples include Apple's [Secure Enclave](https://support.apple.com/guide/security/secure-enclave-sec59b0b31ff/web) and Google's [Titan M](https://security.googleblog.com/2021/10/pixel-6-setting-new-standard-for-mobile.html) series of chips. You should avoid devices that lack a secure element; they won't be able to properly implement secure biometrics without one.