A vehicle security monitoring device monitors sound or movement within a vehicle to determine an abnormal condition such as intrusion of a thief. At its end enclosed by the holder, the ceramic heating device has a segment of greatest diameter and is coated with an insulating layer which has recesses for an electrical contacting. Protected data is initially located in a secure area and is only released to such a secure processing environment so that access for authorized users to the secure data is available, but subsequent release of the secure data by the authorized users to the outside world is controlled.