USER MANUAL
PTM 215B – BLUETOOTH
®
PUSHBUTTON TRANSMITTER MODULE
© 2019 EnOcean | www.enocean.com
F-710-017, V1.0
PTM 215B User Manual | v1.9 | June 2019 | Page 80/85
C.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 opera-
tions. The algorithm execution sequence is shown in Figure 45 below.
The first four bytes of
T_0
are then used to authenticate PTM 215B telegrams.
Figure 45 – Authentication algorithm sequence
