The National Police Agency (NPA) revealed that the Chinese state-linked hacking group MirrorFace was responsible for over 200 cyberattacks targeting Japan’s foreign ministries and semiconductor industry between 2019 and 2024. Additionally, cyber incursions since late December 2024 disrupted financial services, delayed flights, and exposed vulnerabilities in Japan’s critical infrastructure.
Japan’s revised 2022 National Security Strategy identifies cyberattacks as a growing threat, likening cross-border hacks of civilian infrastructure to intimidation tactics that stop short of war.
This has prompted Japan to expand its SDF cyber unit from 620 members in March 2024 to about 2,400 today, with plans to reach 4,000 personnel by 2028. However, this remains small compared to China’s estimated 30,000-member cyber-attack force.
The proposed active defence strategy aims to bolster cooperation between public and private sectors, focusing on safeguarding critical infrastructure, such as energy, transportation, finance, and telecommunications. Japan also plans to establish a National Cyber Security Office in 2025 to coordinate cybersecurity policy, identify vulnerabilities, and advise private sector organizations.
To prevent misuse, strict safeguards will accompany the strategy. Hackers will need prior approval to break into servers unless immediate action is required during active attacks. Penalties will address excessive monitoring or personal data leaks, ensuring transparency and public trust.
Trend Micro’s recent findings underscore the importance of these measures. The security firm attributed recent cyberattacks to distributed denial-of-service (DDoS) campaigns launched by botnets. These attacks overwhelmed network servers with data, causing widespread disruptions to services like Japan Airlines and major banks.
While Japan’s proactive approach is a significant step forward, experts like Professor Kazuto Suzuki caution that it may not deter all attackers. He notes that cyber deterrence is challenging due to the unpredictability of attackers’ methods. However, this strategy is expected to instill some fear of retaliation among hackers and strengthen Japan’s cybersecurity posture.
As cyber threats evolve, Japan’s active defence initiative represents a critical effort to protect its infrastructure, economy, and national security from escalating digital risks.
