公开(公告)号：US20250015990A1

公开(公告)日：2025-01-09

申请号：US18709669

申请日：2022-11-07

Applicant: Endress+Hauser Flowtec AG

Inventor： Nikolai Fink ,  Mathis Zeiher ,  Ervin Binkert

IPC: H04L9/14 ,  H04L9/32

Abstract: A method for detecting data manipulation of a field device is disclosed, said data being sent in the form of data packets using a communication channel. The field device is part of a secure sub-network. The sub-network includes the field device or an edge device and the field device. In a first step, a device key pair having a private device key and a public device key is generated using an asymmetric cryptosystem, where the private device key is stored in a signing sub-network device. In a second step, the signing sub-network device generates, for a group of data packets comprising data packets, a digital data signature using the private device key and transmits said digital data signature and the data packets to the receiving device. In a third step, the receiving device verifies the data packets using the associated data signature and the public device key.