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With the development of IoT and AI technologies, information communication systems are more sophisticated. Therefore, the risk of information security is increasing. In the laboratory, we are researching next-generation network systems, authentication protocols, network anomaly detection, and privacy protection technologies as security countermeasure technologies to prevent cyber-attacks. The design of security schemes is a challenge to optimize both security and convenience/efficiency. To solve this problem, we analyze the risk of the target system and design security measures that eliminate the risks from theoretical and implementation perspectives.