Endress + Hauser Flowtec Ag

Endress + Hauser Process Solutions Ag

Sushil Siddesh

Nikolai Fink

Ervin Binkert

Peter Wazinski

A method for encrypting data of a field device includes steps of 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, and storing the non-homomorphically encrypted data in the first instance. The method also includes retrieving part of the non-homomorphically encrypted data stored in the first instance by a second instance, and decrypting the retrieved, non-homomorphically encrypted data using the second instance the first key. Further, the data is encrypted by the second instance using a homomorphic encryption method using a second key, wherein the homomorphically encrypted data is transmitted to the first instance or to a third instance and stored.

Method for encrypting data of a field device

A method for providing an access key for a field device of automation technology, wherein the access key controls accessing of the field device, includes: producing an individual key; storing the individual key in a database together with an identification feature of the field device; storing the individual key in the field device which is to be unlocked based on an input access key; ascertaining at least the identification feature of the field device for which the access key is to be provided; and forming/producing/generating the access key, such that it includes at least one hash value, wherein the hash value is formed at least from the individual key read-out from the database with the assistance of the ascertained identification feature.

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Basel, Switzerland

Sushil Siddesh