Key distribution process between two units in an isdn/internet connection

摘要

A process is disclosed for requesting and transmitting confidential information, in particular a key, from a second unit to a first unit during a connection of the first unit to the second unit through an ISDN connection and the internet. The process has the following steps: a connection is established between the first unit and the second unit through the ISDN B-channel and the internet; the call number of the first unit and a request for confidential information, in particular a key request, are transmitted to the second unit; the confidential information is transmitted by the second unit through the ISDN D-channel; and a connection is established through the ISDN B-channel between the second unit and the first unit, in case the B-channel is free, to acknowledge the transmission of confidential information.