A secure home telemetry apparatus comprises a measuring device arranged to send wireless telemetry monitor signals to a monitor device 50 which are encoded using Vernam cipher encryption. The monitor device may form part of a personal video recorder (PVR) 30 includes a backhaul communication channel for supplying the telemetry data to a central recording station. The measuring device 62 may be a pacemaker or heart monitor incorporating a flash drive 76. The heart monitor sends signals to the PVR which are encrypted using Vernam cipher encryption. Alternatively the measuring device may be a domestic electricity or gas meter. The meter may control the supply of power to a domestic appliance or the battery of a car depending on the time of day and hourly cost of the electricity.
