The security of the ICT components of industrial systems is gaining great importance in the contextof their criticality for society at large. There is an urgent need for the consideration of security in theirdesign, and for the analysis of the related vulnerabilities and potential threats. The high exposure of criticalinfrastructure to such threats is mainly due to the intrinsic weakness of the communication protocolsused to control the process network. In this paper, after analyzing the shortcomings of the ModBUS protocol,we present a Secure-ModBUS protocol implementation aiming at hardening its confidentiality,integrity, authentication and non-repudiation properties with regard to the communication between theMaster and Slaves of a SCADA architecture.
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