Japan’s New Active Cyber Defence Strategy to Counter Growing Threats

Japan is taking decisive steps to enhance its cybersecurity through a new strategy of “active cyber defence.” This approach enables authorized hackers working for the police or Self-Defence Forces (SDF) to infiltrate servers and neutralize cyber-attack sources before they cause significant damage. The ruling Liberal Democratic Party (LDP), led by Prime Minister Shigeru Ishiba, plans to introduce relevant legislation during the current parliamentary session.

The urgency for stronger cybersecurity measures has escalated due to recent attacks. 

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 infra

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