The security in Critical Systems is a hot topic. The digitalization process is non-stoppable, and new cyber-threats are emerging due to OT and IT integration. Therefore, a need for protecting real-time critical messages is increasing. TSN is the interoperable deterministic Ethernet solution oriented to multiple sectors like Industry, Energy, Automotive and Aerospace that impose strong security requirements. Although TSN can benefit from many IT world field-proven security mechanisms, new security challenges like cyber-attacks to the synchronization plane and to the real-time traffic need to be taken into account. This contribution reviews these specific issues and a Secure TSN approach for the Electric Sector based on the combination of its Mutiport TSN (MTSN) Switch IP core and SAScrypt IP one.
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