Verfahren zur Bestimmung der Bandbreitenanteile Kryptographischer Schlüssel in einem Mehrbenutzerszenario mittels Optimierung

Details

Veröffentlichungs-Nr.

EP4800967

Anmeldetag

28. Februar 2025

Veröffentlichung

2. September 2026

Rechtsraum

EP

IPC

H04L9/08, H04L9/14

Abstract

The disclosure relates to a method and a communication system 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, a first sequence of electromagnetic signal pulses to a first receiving unit among the plurality of receiving units via a first communication channel among the plurality of communication channels 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 first random bit sequence according to a key distribution protocol. The method further comprises transmitting, at the sending unit, a second sequence of electromagnetic signal pulses to a second receiving unit among the plurality of receiving units via a second communication channel among the plurality of communication channels for establishing a second cryptographic key shared between the sending unit and the second receiving unit, wherein each electromagnetic signal pulse of the second sequence of electromagnetic signal pulses corresponds to a bit of a second random bit sequence according to the key distribution protocol. The method further comprises determining a first key bandwidth share for the first sequence of electromagnetic signal pulses, and determining a second key bandwidth share for the second sequence of electromagnetic signal pulses, wherein the first key bandwidth share and the second key bandwidth share are determined by means of an optimization, wherein an optimization functional of the optimization depends on a user-selected distribution parameter that reflects a degree of uniformity in the amount of the first and second secret cryptographic keys shared with the first receiving unit and the second receiving unit, respectively.

Anmelder

Firma

Terra Quantum AG

Land

🇨🇭 Schweiz

Fachgebiete