EP 0136681 B1 19880713 - METHOD FOR ENCRYPTED INFORMATION TRANSMISSION
Title (en)
METHOD FOR ENCRYPTED INFORMATION TRANSMISSION
Publication
Application
Priority
DE 3335672 A 19830930
Abstract (en)
[origin: EP0136681A2] 1. Method for the coded transmission of messages in transmission systems having permanently stationary and/or mobile subscriber units (terminals), for example in telephone, car telephone or radio networks, in which method a transmitter (4) for an individual subscriber code is arranged in the terminal of one transmission side and an analyser (8) is arranged in the other transmission side which is constructed as central station and is only accessible from the exchange side and in which method, in a first method step, the subscriber number is transmitted from the transmission side containing the transmitter (4) to the other transmission side, the subscriber code is determined in the latter and the receiver is set in accordance with the code and in which method, thereafter, in a second method step, the transmission path is switched through to the transmit section in the terminal containing the transmitter (4), for transmitting the coded useful signal, characterized by a hierarchical structure, in such a manner that several terminals are in each case connected to a centre in the networks and the code signalling from the terminal to the central unit occurs in a non system-compatible sequence, and also in that, in the first method step, the code set is transmitted from the transmission side containing the transmitter (4) to the other transmission side constructed as central station.
IPC 1-7
IPC 8 full level
H04K 1/00 (2006.01)
CPC (source: EP)
H04K 1/00 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0136681 A2 19850410; EP 0136681 A3 19850605; EP 0136681 B1 19880713; AT E35754 T1 19880715; DE 3335672 A1 19850404; DE 3472742 D1 19880818
DOCDB simple family (application)
EP 84111665 A 19840928; AT 84111665 T 19840928; DE 3335672 A 19830930; DE 3472742 T 19840928