Towards secure fieldbus communication

Authors:
Felix Wieczorek;Christoph Krauß;Frank Schiller;Claudia Eckert
Affiliations:
Beckhoff Automation, Scientific Safety & Security, Nuremberg, Germany;Fraunhofer Research Institution AISEC, Garching, Germany;Beckhoff Automation, Scientific Safety & Security, Nuremberg, Germany;Technische Universität München, Garching, Germany
Venue:
SAFECOMP'12 Proceedings of the 31st international conference on Computer Safety, Reliability, and Security
Year:
2012

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Abstract

In this paper, we present an approach to secure fieldbus communication of automation systems used in security-critical applications. We propose a protocol that applies a scheme combining a stream cipher and a Message Authentication Code (MAC) to ensure integrity, confidentiality, authenticity, and freshness of transmitted telegrams over a fieldbus while maintaining real-time constraints. The security discussion shows that the protocol is secure against an adversary attacking the fieldbus communication. A first proof-of-concept implementation for the EtherCAT fieldbus protocol is implemented to perform some initial runtime analyses.