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EP0090771A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and apparatus for the enciphered transmission of information

Assignee: Gretag AG
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Filing: 1983-03-21
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Granted: —
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Expires: 2003-03-21
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Abstract

Abstract 1. Process for the coded transmission of messages, whereby said messages are mixed on the sender side with a pulse sequence produced by a cipher generator determined by at least one secret cipher key and recovered on the receiver side by mixing with an identical pulse sequence produced by an identical cipher generator determined by the same cipher key, characterized in that the sender and receiver stations are tuned to each other prior to being placed in their respective locations, preferably by connecting them by a cable, thereby automatically producing an identifying key (ID) and permanently storing it on both sides, and that at least during a predetermined period of time all messages are coded and decoded by using said identifying key as the cipher key.

Inventors

  • 👤 Kurt Hugo Dr. Mueller

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 13:02
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/32; H04L9/12

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

DE2706421B1 Cited
US4200770A Cited
GB2050021A Cited
EP0035448A1 Cited

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