US 12,284,266 B2
Method for encrypting data of a field device
Peter Wazinski, Freiburg (DE); Ervin Binkert, Möhlin (CH); and Sushil Siddesh, Basel (CH)
Assigned to ENDRESS+HAUSER PROCESS SOLUTIONS AG, Reinach (CH)
Appl. No. 17/995,496
Filed by Endress+Hauser Process Solutions AG, Reinach (CH)
PCT Filed Mar. 23, 2021, PCT No. PCT/EP2021/057451
§ 371(c)(1), (2) Date Oct. 5, 2022,
PCT Pub. No. WO2021/204534, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 10 2020 109 896.0 (DE), filed on Apr. 8, 2020.
Prior Publication US 2023/0179396 A1, Jun. 8, 2023
Int. Cl. H04L 9/00 (2022.01); H04L 9/08 (2006.01)
CPC H04L 9/008 (2013.01) [H04L 9/0822 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for encrypting data of a field device, comprising:
generating data using the field device;
encrypting the data by the field device using a non-homomorphic encryption method using a first key;
transmitting the non-homomorphically encrypted data to a first instance;
storing the non-homomorphically encrypted data in the first instance;
retrieving at least a part of the non-homomorphically encrypted data stored in the first instance by a second instance;
decrypting the retrieved, non-homomorphically encrypted data using the second instance using the first key;
encrypting the data by the second instance by means of a homomorphic encryption method using a second key;
transmitting the homomorphically encrypted data to the first instance or a third instance;
storing the homomorphically encrypted data in the first instance or in the third instance; and
supplying the field device with electrical energy required for operation from at least one of, an energy storage unit included as a part of the field device or a communication network wherein the field device is embedded.