Prepare for the Initial 48 Hours of a Data Breach: Practical FAQ on Reporting, Notification, and Public Disclosure Decisions Released for Free
Sunknet Co., Ltd. has released a special page with a practical FAQ, organized in a Q&A format, covering initial response, reporting to the Personal Information Protection Commission, and decisions on notifying individuals and public disclosure when a data breach occurs. This resource is available for free to companies of all sizes as a 'field reference' to prevent misjudgments and delays in emergency situations.
📋 Article Processing Timeline
- 📰 Published: May 12, 2026 at 19:00
- 🔍 Collected: May 12, 2026 at 10:31
- 🤖 AI Analyzed: May 12, 2026 at 10:43 (11 min after Collected)
Sunknet Co., Ltd. (Headquarters: Koto-ku, Tokyo; Representative Director: Yoshio Katamachi) has released a special page that organizes the 'initial response,' 'reporting to the Personal Information Protection Commission,' and 'decisions on notifying individuals and public disclosure'—critical judgments made on-site when a data breach occurs—in a Q&A format. This resource is available for free to companies of all sizes as a 'field reference' to prevent misjudgments and delays in emergency situations.
Public URL
https://lp041.sanku.net/
Background
With security risks becoming more severe, as evidenced by the record number of data breach incidents at listed companies in 2024, data breach response requires simultaneous technical investigation, rapid decision-making on regulatory compliance, individual notification, inquiry handling, and recurrence prevention. However, on-site, due to a lack of precedents and information, judgments tend to be subjective, and delays in initial response increasingly lead to expanded damage and loss of trust. Therefore, our company has created and released a practical FAQ that can be used immediately.
Features of this FAQ
Organizes everything from 'containment, evidence preservation, and system establishment' required immediately after detection to reporting, notification, and public disclosure decisions in a Q&A format.
Provides judgment points for high-risk cases such as sensitive personal information, card information, and unauthorized access.
Available for free, it can be used by small to large enterprises for establishing systems and creating procedures during normal times.
Featured Topics (Excerpt)
Initial response: Network isolation, log preservation, access restrictions for stakeholders.
Reporting: Necessity and deadline for reporting to the Personal Information Protection Commission (misconception that 'less than 1000 cases = not required').
Individual notification/public disclosure: Selection of notification methods, handling undelivered emails, caution during the suspicion stage.
High-risk cases: Dark site publication, My Number, credit card information.
Legal risks: Leakage by contractors, employee-caused incidents, social risks of non-disclosure.
Recurrence prevention: Organization of measures from three aspects: technology, operation, and people (education).
Comment from Representative Director Yoshio Katamachi
Data breach response requires continuous decision-making within a limited time. We hope this FAQ will serve as a 'common language' that can be referenced first on-site, helping to prevent the spread of damage and ensure consistency in explanations.
Inquiries
For consultations and inquiries regarding the data breach response support service, please contact us below.
Dedicated dial (for urgent cases): 0120-039-564 (Weekdays 9:00-18:00)
Individual estimates: info@sanku.net (24-hour reception)
Related Links
Data Breach Response Support Service Introduction: https://lp040.sanku.net/
Support Material Download: https://www.sanku.net/report/情報漏洩支援詳細資料（サンクネット）.pdf
First Announcement Press Release: https://prtimes.jp/main/html/rd/p/000000004.000167971.html
Company Profile
Sunknet Co., Ltd. (founded in 1997) provides call center operations, IT support, and logistics, with ITO and BPO as its core. It has obtained ISMS (ISO/IEC 27001) and Privacy Mark certifications, supporting a wide range of clients from government agencies to listed companies.
URL: https://www.sanku.net/
[Inquiries regarding this release]
Sunknet Co., Ltd. Public Relations
Address: MR Kiba Building, 1-3-1 Kiba, Koto-ku, Tokyo 135-0042
Email: press@sanku.net TEL: 03-5677-3311
Public URL
https://lp041.sanku.net/
Background
With security risks becoming more severe, as evidenced by the record number of data breach incidents at listed companies in 2024, data breach response requires simultaneous technical investigation, rapid decision-making on regulatory compliance, individual notification, inquiry handling, and recurrence prevention. However, on-site, due to a lack of precedents and information, judgments tend to be subjective, and delays in initial response increasingly lead to expanded damage and loss of trust. Therefore, our company has created and released a practical FAQ that can be used immediately.
Features of this FAQ
Organizes everything from 'containment, evidence preservation, and system establishment' required immediately after detection to reporting, notification, and public disclosure decisions in a Q&A format.
Provides judgment points for high-risk cases such as sensitive personal information, card information, and unauthorized access.
Available for free, it can be used by small to large enterprises for establishing systems and creating procedures during normal times.
Featured Topics (Excerpt)
Initial response: Network isolation, log preservation, access restrictions for stakeholders.
Reporting: Necessity and deadline for reporting to the Personal Information Protection Commission (misconception that 'less than 1000 cases = not required').
Individual notification/public disclosure: Selection of notification methods, handling undelivered emails, caution during the suspicion stage.
High-risk cases: Dark site publication, My Number, credit card information.
Legal risks: Leakage by contractors, employee-caused incidents, social risks of non-disclosure.
Recurrence prevention: Organization of measures from three aspects: technology, operation, and people (education).
Comment from Representative Director Yoshio Katamachi
Data breach response requires continuous decision-making within a limited time. We hope this FAQ will serve as a 'common language' that can be referenced first on-site, helping to prevent the spread of damage and ensure consistency in explanations.
Inquiries
For consultations and inquiries regarding the data breach response support service, please contact us below.
Dedicated dial (for urgent cases): 0120-039-564 (Weekdays 9:00-18:00)
Individual estimates: info@sanku.net (24-hour reception)
Related Links
Data Breach Response Support Service Introduction: https://lp040.sanku.net/
Support Material Download: https://www.sanku.net/report/情報漏洩支援詳細資料（サンクネット）.pdf
First Announcement Press Release: https://prtimes.jp/main/html/rd/p/000000004.000167971.html
Company Profile
Sunknet Co., Ltd. (founded in 1997) provides call center operations, IT support, and logistics, with ITO and BPO as its core. It has obtained ISMS (ISO/IEC 27001) and Privacy Mark certifications, supporting a wide range of clients from government agencies to listed companies.
URL: https://www.sanku.net/
[Inquiries regarding this release]
Sunknet Co., Ltd. Public Relations
Address: MR Kiba Building, 1-3-1 Kiba, Koto-ku, Tokyo 135-0042
Email: press@sanku.net TEL: 03-5677-3311