Computerimplementiertes Verfahren für eine Effiziente Pos-Session (pop) eines Privaten Kryptographischen Schlüssels eines Schlüsselverkapselungsmechanismus (kem)

Details

Veröffentlichungs-Nr.

EP4823038

Anmeldetag

8. April 2025

Veröffentlichung

14. Oktober 2026

Rechtsraum

EP

IPC

H04L9/30, H04L9/32

Abstract

System, PoP-provider and computer-implemented method for an efficient proof-of-possession (PoP) of a private cryptographic key of a key encapsulation mechanism (KEM), comprising the steps:- Receiving, by a PoP-provider (21, 31, 41), the KEM public key (PK) of a key pair consisting of a KEM public key (PK) and a KEM private key (SK) generated by the user device, from the user device (20, 30, 40),- Generating, by the PoP-provider (21, 31, 41), a first secret (K1) and a ciphertext data structure (CT) by performing an KEM encapsulation operation using the KEM public key (PK),- Generating, by the user device (20, 30, 40), a second secret (K2) by performing a KEM decapsulation operation using the KEM private key (SK) and the cipher-text data (CT) received from the PoP-provider (21, 31, 41),- Confirming proof-of-possession of the KEM private key (SK) in the user device (20, 30, 40), by the PoP-evaluator (22, 32, 42), if the second secret (K2) generated by the user device (20, 30, 40) corresponds with the first secret (K1) generated by the PoP-provider (21, 31, 41).

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Firma

Siemens Aktiengesellschaft

Land

🇩🇪 Deutschland

Fachgebiete