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Systems using 5G are expected to be used in various cases of Society 5.0 andIndustrie 4.0 such as smart cities, smart factories, and also criticalinfrastructures. These systems are essential for our life, thus cyberattacksagainst the system must be prevented. In this paper, we tackle two problemsposed by 5G features: system construction using multi-vendor devices andsoftwarized functions. Specifically, there are supply-chain risks thatmalicious devices are used in the construction phase. Moreover, the softwarizednetwork functions are easy to be attacked compared to hardware. To cope withthese problems, we propose a concept of architecture comprising a blockchain torecord security events including supply-chain information and a tamperdetection engine to ensure the integrity of software components in 5G system.We implement the initial prototype of the architecture and show itsfeasibility.

Security Architecture for Trustworthy Systems in 5G Era