National Cybersecurity Office Updates Site with Advisories and Materials
SUMMARY
The National Cybersecurity Office (NCO) continues to post warnings about impersonation calls and suspicious emails on its official site, and in October 2026 published a joint endorsement of an international advisory on companies supporting China government-linked attack groups, an alert on responses to unauthorized access incidents, a press release on the enforcement of the Cyber Response Capacity Enhancement Act, and other notices. The site also provides a notice about a URL change and publishes cybersecurity materials such as the Cybersecurity Handbook (Ver.3.0).
The National Cybersecurity Office (NCO) official website states its mission as "to ensure a free, fair, and secure cyberspace," and functions as a public information source and liaison with relevant agencies. The site organizes links to multiple guidances and handbooks, including ransomware countermeasures, legal Q&A, and educational materials.
The site posts a user notice titled "Be aware of suspicious calls impersonating the National Cybersecurity Office (NCO)," advising users to watch for impersonation emails and suspicious calls demanding money. A PDF notice about a change of the site URL is also published.
The news section lists updates from October 2026: on October 9 it published a "joint endorsement of an international advisory on companies supporting cyber attack groups related to the Chinese government" and an alert "regarding responses based on incidents of leaks due to unauthorized access"; on October 1 it posted a press release on the enforcement of the Cyber Response Capacity Enhancement Act and its related laws; and on October 19 it released a press statement on the Cabinet Cyber Director's business trip results to Singapore.
The site also lists related links to relevant ministries and agencies (such as the National Police Agency, 総務省, 外務省, 経産省, 防衛省) and organizations like IPA, and provides its domestic and international social media accounts (X, Facebook, YouTube, LinkedIn). Detailed materials and the full texts of advisories are published as PDFs or individual pages, so please refer to those for specific countermeasures and legal explanations.
- #cybersecurity
- #incident-response
- #advisory
Source
国家サイバー統括室（NCO）公式サイト — https://www.cyber.go.jp/This article summarizes the content of the source below. Refer to the original source for accuracy. Last updated: October 21, 2026
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