Herstellung einer Vielzahl von Geheimen Kryptographischen Schlüsseln, die zwischen einer Sendeeinheit und mehreren Empfangseinheiten Geteilt Werden

Details

Veröffentlichungs-Nr.

EP4800968

Anmeldetag

28. Februar 2025

Veröffentlichung

2. September 2026

Rechtsraum

EP

IPC

H04L9/08, H04L9/14

Abstract

The disclosure relates to a method for establishing a plurality of secret cryptographic keys shared between a sending unit and a plurality of receiving units, wherein the sending unit is connected to the plurality of receiving units by a plurality of communication channels. The method comprises transmitting, at the sending unit, at least one first electromagnetic test pulse to a first receiving unit among the plurality of receiving units via a first communication channel among the plurality of communication channels, and determining a first signal loss in the first communication channel based on the at least one first electromagnetic test pulse detected at the first receiving unit. The method further comprises transmitting, at the sending unit, a first sequence of electromagnetic signal pulses to the first receiving unit via the first communication channel for establishing a first cryptographic key shared between the sending unit and the first receiving unit, wherein each electromagnetic signal pulse of the first sequence of electromagnetic signal pulses corresponds to a bit of a random bit sequence according to a key distribution protocol. The method further comprises transmitting, at the sending unit, at least one second electromagnetic test pulse to a second receiving unit among the plurality of receiving units via a second communication channel among the plurality of communication channels, and determining a second signal loss in the second communication channel based on the at least one second electromagnetic test pulse detected at the second receiving unit. The method further comprises determining a first key bandwidth share for the first sequence of electromagnetic signal pulses, wherein both the determined first signal loss and the determined second signal loss are taken into account for determining the first key bandwidth share.

Anmelder

Firma

Terra Quantum AG

Land

🇨🇭 Schweiz

Fachgebiete