Method and devices for verifying authorization of an electronic device

US11184161B2 · kind B2 · utility

Assignee

• LEGIC Identsystems AG · CH

Inventor

• Martin Buck · Hersbruck, DE

Key dates

• Filing date: Jul 17, 2018
• Grant date: Nov 23, 2021
• Expiry date: Dec 11, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L9/083
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

For verifying authorization associated with a first electronic device by a second electronic device, using symmetric key encryption, the second electronic device receives from the first electronic device encrypted data and metadata with a key space identifier and positional information. The key space identifier defines a cryptographic key hierarchy and the positional information defines in the cryptographic key hierarchy the cryptographic key used to generate the encrypted data. The second electronic device derives the cryptographic key by way of a one-way function from cryptographic keys stored in the second electronic device, using the key space identifier and the positional information received from the first electronic device. The second electronic device decrypts the encrypted data, using the derived cryptographic key, for verifying the authorization associated with the first electronic device.