PCT No. PCT/DE90/00270 Sec. 371 Date Dec. 12, 1991 Sec. 102(e) Date Dec. 12, 1991 PCT Filed Apr. 5, 1990 PCT Pub. No. WO90/16124 PCT Pub. Date Dec. 27, 1990.A public communication system for a plurality of communication services (ISDN) has an arrangement for the authentification of the subscriber stations (TLN A, TLN B) for the key transmission. For a first security level this authentification arrangement has an arrangement for monitoring the time frame (24) of the key transmission and/or an arrangement (A) for the indication of the agreed key in reduced form at the subscriber end, and for a second security level a key management station (SMZ) for authenticated traffic handling
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