Motor vehicle theft protection with coding involves reading second key from device to volatile controller memory when connecting controller/device, decoding coded data with first key, encoding with second key, writing to non-volatile memory

摘要

The method involves writing a first key (1) and data (5) encoded using it into a non-volatile memory (21) of a motor vehicle controller (11) and writing a second key (2) into a non-volatile memory (23) of a motor vehicle device (12). It involves reading the second key out of the device into a volatile memory of the controller when a first connection is made between the controller and the device, decoding the coded data using the first key, encoding the data using the second key and writing it into the non-volatile memory of the controller. An independent claim is also included for a theft protection device.