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 @ IFA 2018: Product innovation on board! - Nuki
Nuki Smart Lock 3.0 Pro, Smart Door Lock with WiFi Module for Remote Access, Black & Keypad, Front Door Code Lock, Open and Close via 6 Digit Access Code : : DIY
We present the Nuki Keypad 2.0 - Now you can open your door with your fingerprint! - Nuki
Nuki Smart Lock 3 Pro Black + Nuki Keypad 2 Bundle
Nuki Talks with Homey
STL file NUKI KEYPAD 2.0 ANTI-THEFT FRAME 🖼️・3D print design to download・Cults
Keypad 2 - Open your door with your fingerprint
Nuki Keypad - Retrofittable code lock - Extension for the Nuki Smart Lock
Nuki Keypad Combo Bundle Review
Nuki Keypad Combo Bundle Review
Nuki Keypad - Simply for everyone. - Nuki
Nuki Keypad
Insights into development: the Keypad 2.0 from Nuki » xitec
Nuki Keypad 2: Now with fingerprint
Nuki Keypad – Simply for everyone. Secure for everyone.