Nihon Cyber Defence

Susumu Toriumi Appointed Chief Operating Officer of Nihon Cyber Defence

Nihon Cyber Defence (NCD) (Head Office: Chiyoda-ku, Tokyo, CEO: Cartan McLaughlin), a company pioneering sovereign cyber technology in Japan, today announced the appointment of Susumu Toriumi as Chief Operating Officer (COO). Toriumi brings an extensive background in technology leadership, business strategy, and emerging technologies to NCD at a time of rapid company expansion.

Purpose of Appointment

Toriumi’s appointment strengthens NCD’s executive team as the company operationalises its fully Japan-built cyber defence platform. His blend of technical depth and strategic leadership will be critical as NCD scales deployment across Japan’s critical infrastructure and delivers sovereign resilience at pace.

“I am honoured to join NCD at such a critical moment for Japan’s cyber resilience. NCD’s mission to build sovereign cyber capabilities strongly resonates with my passion for advancing technology and driving impactful innovation. I look forward to working with the team to accelerate our growth and deliver trusted solutions to our customers and partners.”

— Susumu Toriumi (COO)

“Susumu’s unique combination of class-A consulting experience, deep technical knowledge, and entrepreneurial leadership in blockchain makes him an ideal COO for this phase of growth. As we scale deployment, his operational focus and strategic mindset will be key to ensuring NCD delivers on its mission to secure Japan’s sovereign cyber resilience.”

— Cartan McLaughlin, Founder & CEO

Susumu Toriumi

Toriumi joins NCD from Datachain, where he served as Chief Operating Officer driving blockchain interoperability solutions for public and enterprise networks. His earlier career includes seven years at The Boston Consulting Group (BCG) leading digital transformation and growth strategy projects. Toriumi holds a Ph.D. and M.Sc. in Computer Science from The University of Tokyo, specialising in optimisation algorithms and agent-based middleware.

Looking Ahead

With Susumu Toriumi stepping into the COO role, NCD is positioned to accelerate operational execution, strengthen cross-functional coordination, and scale its made-in-Japan cyber defence platform across critical sectors. His leadership will be instrumental in ensuring delivery readiness as NCD enters strategic partnerships and deepens engagement with Japan’s public and private sector stakeholders to advance digital sovereignty.

Contact

For more information, please contact Julie Harvey, Head of Go-to-Market
press@nihoncyberdefence.co.jp

More from NCD​

Preparing for Active Cyber Defense (ACD)

Japan’s Active Cyber Defense (ACD) policy is set to transform cyber security, requiring critical infrastructure operators to comply with new reporting mandates. Ret. Adm. Akira Ichida explores the...

Nihon Cyber Defence and Fivecast Partner to Enhance Cyber Threat Intelligence for Japan

The collaboration combines Fivecast’s advanced AI-powered OSINT technology with NCD’s expertise in cyber threat intelligence and Japanese cyber security needs, delivering actionable intelligence...

Navigating Cyber Incident Response 

Unprepared cyber incident response can lead to prolonged damage. Learn practical strategies to strengthen resilience, improve decision-making speed, and build a proactive response framework in this...

Safeguarding Japan’s Critical Infrastructure 

Japan's energy and food security depend on resilient supply chains, but cyber threats to critical infrastructure are rising. Discover strategies to safeguard OT systems and protect vital industries in...

A Strategic Guide for Building Cyber Resilience

Cyber resilience is a strategic necessity. Discover five key strategies to minimize cyber incident impacts and strengthen long-term security, based on insights from Dr. Jamie Saunders and the World...

Leadership & Cyber Resilience | Vol. l

Cyber security is a boardroom issue. John Noble shares essential non-technical questions that leaders must ask to strengthen cyber resilience and governance in today’s digital landscape...

NCD Cyber Threat Intelligence: Gelsemium APT Group

The China-linked Gelsemium APT group poses a growing cyber threat to Japanese organizations, targeting sensitive data through advanced malware. Learn how to protect your business from espionage...

How Japanese Organizations Can Overcome Ransomware Challenges

Ransomware attacks are exposing critical weaknesses in Japanese organizations. Learn how to overcome systemic security barriers, enhance resilience, and implement proactive cyber security strategies...

Beyond Dollars: The True Impact of Cyber Attacks

Cyber attacks cause more than financial losses—they disrupt critical services, expose vulnerabilities, and threaten national security. Discover the true cost of cyber threats beyond dollars in this...
Edit Template