Computergestütztes Verfahren zur Erzeugung einer Digitalen Signatur für eine Nachricht in einer Kryptographischen Architektur mit Privatem und Öffentlichem Schlüssel, Welches die Wiederherstellung des Privaten Schlüssels Ermöglicht, und Verfahren zur Wiederherstellung des Privaten Schlüssels

Details

Veröffentlichungs-Nr.

EP4742591

Anmeldetag

24. September 2025

Veröffentlichung

13. Mai 2026

Rechtsraum

EP

IPC

H04L9/32(INST SOFTWARE CAS et al.)(주식회사 블록체인기술연구소)(BALANCEPOLE INC et al.)

Abstract

The subject of the application is a computer-implemented method for generating a digital signature for a message (M) in a private-key and public-key cryptographic architecture, enabling recovery of the private key for the message (M) based on the message (M), using two pairs of cryptographic keys, wherein the first key pair comprises a first private key (x_A) and a first public key (y_A), and the second key pair comprises a second private key (x_B) and a second public key (y_B), a signature for the message (M) is generated in steps in which: a first auxiliary value (d) is generated such that d←yBxA, a second auxiliary value (k) is generated such that k ← hash(d ∥ M), a third auxiliary value (r) is generated such that r ← g^k, a hash function value (e) is generated for the message (M) and the third auxiliary value (r) such that e ← hash(M ∥ r), a signature (s) is generated for the message (M) s ← k - x_A · e mod q, the message (M) is linked with the signature (s) and the hash function value (e). The subject of the application also relates to a computer-implemented method for recovering the private key (x_A) from a message (M).

Anmelder

Firma

Naukowa I Akademicka Siec Komputerowa Panstwowy Instytut Badawczy

Land

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