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Emerging maritime services rely more on digital message exchanges and less on voice communication. This requires proper implementation of mechanisms that provide robust and appropriate security for the technology that is used for ship-ship and ship-shore communication, both near shore and in open waters. This paper presents the concept of multi-modal communication, which encompass digital message exchange over different types of technologies and between sectors. We point to security challenges for existing technologies, and suggest how we can address these using an example from Search and Rescue operations that involves the maritime and additional sectors.

This work has been partially supported by the Research Council of Norway through the projects "Cyber Security in Merchant Shipping - Service Evolution" with contract number 295969 and "Digital Ecosystems for Smart and Autonomous Ships" with contract number 309255.