The Nuki Keypad uses the same encryption mechanism you already know, because it is also used for communication between the Nuki App and Nuki Smart Lock.
Nuki Keypad 2: Open your door with a code or fingerprint #NukiBasics
Nuki Keypad 2.0 Open the door with a code or fingerprint quickly and conveniently - the perfect accessory for Nuki Smart Lock, Bluetooth : : Home & Kitchen
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Nuki Keypad - Simply for everyone. - Nuki
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We present the Nuki Keypad 2.0 - Now you can open your door with your fingerprint! - Nuki
Abode debuts new smart lock with a retrofit design, but HomeKit support is missing - 9to5Mac
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STL file NUKI KEYPAD 2.0 ANTI-THEFT FRAME 🖼️・3D print design to download・Cults