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1. (WO2018184054) METHOD FOR CREATING AND DISTRIBUTING CRYPTOGRAPHIC KEYS

Pub. No.:    WO/2018/184054    International Application No.:    PCT/AT2018/060063
Publication Date: Fri Oct 12 01:59:59 CEST 2018 International Filing Date: Wed Mar 14 00:59:59 CET 2018
IPC: G06F 11/10
H04L 9/08
Applicants: AIT AUSTRIAN INSTITUTE OF TECHNOLOGY GMBH
Inventors: KRENN, Stephan
LORÜNSER, Thomas
SCHRENK, Bernhard
PACHER, Christoph
Title: METHOD FOR CREATING AND DISTRIBUTING CRYPTOGRAPHIC KEYS
Abstract:
The invention relates to a method for creating and distributing cryptographic keys, in particular for securing the communication at two terminals (A, B), wherein a) signals for creating correlated values in the two terminals (A, B) are distributed via a first communication channel (Q) burdened with error, in particular via a quantum communication channel, and said correlated values are present as keys (kA, kB) in the two terminals in such a manner, b) a checksum (sA) is formed on the basis of the first key (kA) present in the first terminal (A) and said checksum (sA) is transferred to the second terminal (B) via a second communication channel (L) different from the first communication channel (Q), c) a second checksum (sB) is formed on the basis of the second key (kB) present in the second terminal (B), and the two checksums (sA, sB) or the difference (serr) of the two checksums (sA, sB) or information derived therefrom is transferred via the second communication channel (L) to a server (C), which is different from the two terminals (A, B) and is spatially separated therefrom, d) on the basis of the two checksums (sA, sB) or the difference (serr) of the two checksums (sA, sB) or the information derived therefrom, the server (C) determines a correction value (kerr), which, when applied to one or both keys (kA, kB), brings the keys (kA, kB) into correspondence, and e) the correction value (kerr) is transferred to one or both terminals (A, B) via the second communication channel (L) and is applied to one or both keys (kA, kB).