17 Dec
2003
17 Dec
'03
11:17 p.m.
Re:
P.S. Better yet: There is no need of Public key technology. It suffices for the car unit to send DES(k, n) on the nth transmission. k is a constant secret key shared between car unit and garage unit. Garage unit decodes and verifies that n is greater than it has seen before.
The only problem with this is that you are limited to one remote per base station. jpb