6) Upon receiving the messages, the TTP verifies the
correctness of the value Kt, then computes the random
numbers K0n
and K00
n, obtains the values of the pair value
of G0
n and G0
n+1, and sends them back the new owner
via the secure channel. Now the new reader can initiate
a mutual authentication with the tag.
7) Both the TTP and the tag can update the PIN internally
as PINnew = F(PINold Gn).
n and Kt =
F(Gn Gn+1), and sends them to the reader.
5) The reader forwards these messages to the TTP.