User's Manual

USER MANUAL PREVIEW
PTM 535BZ – BLUETOOTH AND ZIGBEE GREEN POWER PUSHBUTTON TRANSMITTER
© 2022 EnOcean | www.enocean.com F-710-017, V1.0 PTM 535BZ User Manual | v1.2 | July 2021 | Page 116/121
D.2 Algorithm execution sequence
The algorithm uses the variable internal parameters A_0, B_0, B_1 together with the private
key to generate the authentication vector T_0 using three AES-128 and two XOR operations.
The algorithm execution sequence is shown in Figure 60 below. The first four bytes of T_0
are then used to authenticate PTM 535BZ telegrams.
Figure 60 – Authentication algorithm sequence