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The approach presented in this paper provides effective protection of critical business processes by applying advanced SIEM technology in a rigorous fashion, based on the results of accurate risk assessment. The proposed SIEM tool advances the State of The Art of the technology along two axes, specifically: privacy and integrity. The advancements are achieved via combined use of two of the most promising technologies for trusted computing, namely: Trusted Execution Environment (TTE) and Homomorphic Encryption (HE). The approach is validated with respect to a real use case of a Smart Hospital (i.e., one where IT is massively used), with challenging security requirements. The use case is contributed by one of the major public hospitals in Italy. Experiments demonstrate that, by relying on continuous monitoring of security relevant events and advanced correlation techniques, the SIEM solution proposed in this work effectively protects the critical workflows of the hospital business processes from cyber-attacks with high impact (specifically: serious harm to or even death of the patient).

Risk Assessment Driven Use of Advanced SIEM Technology for Cyber Protection of Critical e-Health Processes