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add accelerometer info

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blog/posts/biometrics-explained.md
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@ -162,10 +162,14 @@ Model-free approaches don't try to model the human body but instead use the whol
### Accelerometer
Accelerometers such as those found in your smartphone can also be used for gait recognition.
Accelerometers such as those found in your smartphone can also be used for gait recognition. These need to be worn on a person's body so they can't be used from long distance like camera-based approaches.
Accelerometers work by measuring the accelerations in 3D space in X, Y, and Z coordinates. They tend to also utilize gyroscopes, which measure the orientation of a device.
### Floor Sensor
## :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.