Member Introduction

Ryoichi Teramura

Ryoichi Teramura, Senior Executive Officer and General Manager of the Cybersecurity Business Headquarters at GMO Cybersecurity by Ierae, brings extensive experience from his role as a co-founder of a joint venture between a major consulting firm and a global automotive components manufacture. He specializes in cyber security consulting and cryptography research. He has a doctorate and he is serving as a member of the CRYPTREC (Cryptography Research and Evaluation Committees) .
Actively engaged in professional activities, serving as a member of the CRYPTREC Cryptography Utilization Committee.
CISSP / GXPN /Ph.D. in Engineering

Hikohiro Lin

Hikohiro Lin is a recognized pioneer in product security and PSIRT activities, boasting over 20 years of experience in the field. His expertise lies in designing and implementing security testing methodologies and risk assessments for IoT devices, developing product security standards and guidelines, establishing global product security frameworks, and building Product Security Incident Response Teams (PSIRTs). A sought-after speaker, he has presented at prominent events like BlackHat, CODEBLUE, SAS, FIRST, the United Nations IGF, and various government-hosted IoT security roundtables. His contributions extend to serving as a review board member for renowned events like HITCON and HITB (Hack In The Box). Furthermore, his influence within Japan's manufacturing industry is evidenced by his receipt of the (ISC)² ISLA (Information Security Leadership Achievement) APAC Senior Information Security Professional Showcased Honoree award and the Community Service Star in 2018.
Recognized as a pioneer in product security and PSIRT activities within Japan's manufacturing industry, receiving the (ISC)² ISLA (Information Security Leadership Achievement) APAC Senior Information Security Professional Showcased Honoree award and the Community Service Star in 2018.

Shinji Abe

Shinji Abe is a recognized leader in the cybersecurity domain, bringing extensive experience from both the telecommunications industry and security operations. After leading the Security Operations Center (SOC) at a major telecommunications provider, he joined GMO Cybersecurity by Ierae to spearhead the establishment of their SOC Innovation business. Abe's influence extends beyond his organizational roles, as evidenced by his position as Vice Chair of the Japan Security Operation Providers Council (ISOG-J). He has also made significant contributions to the field through authorship, including co-authoring the ISOG-J "Textbook for Security Response Organizations" and the ITU-T international standard recommendation "X.1060." His dedication to advancing cybersecurity is further demonstrated through his founding and leadership of the Japan SOC Analyst Information Sharing Community (SOCYETI) and his service as an expert committee member for the Information-technology Promotion Agency (IPA). He holds the CISSP certification.
Engages in diverse activities, including founding and leading the Japan SOC Analyst Information Sharing Community (SOCYETI) and serving as an expert committee member for the Information-technology Promotion Agency (IPA). Holds the CISSP certification.

Sayfiev Ruslan

Sayfiev Ruslan, possessing expertise in vulnerability assessment and penetration testing, honed his skills as a system administrator and security engineer in Russia. Upon relocating to Japan, he shifted his focus towards vulnerability assessments for web applications, networks, APIs, and automotive systems. His specialization lies in penetration testing, red team exercises, and the development and validation of vulnerability assessment tools. Holding certifications such as OSEE, OSCP, and GXPN, his expertise is further validated by numerous awards from Capture The Flag (CTF) competitions.
Specialized in penetration testing, red team exercises, and the development and validation of vulnerability assessment tools.
Holds certifications such as OSEE, OSCP, and GXPN, with numerous awards from Capture The Flag (CTF) competitions.

Yuki Koike

Yuki Koike, Executive Officer of the Cybersecurity Business Headquarters at GMO Cybersecurity by Ierae, brings extensive experience from his role as a founding member of a cybersecurity startup. He specializes in consulting, penetration testing, and fuzzing research. A recognized leader in the security community, he captains binja, one of Japan's premier CTF teams, garnering multiple awards in international competitions. His expertise was acknowledged early in his career when he was selected as a speaker at CODE BLUE 2015 in the U25 category.

Fumikazu Okuno

Fumikazu Okuno brings extensive experience in delivering mission-critical services to government clients across a wide range of domains, including information systems, digital transformation (DX), cloud computing, cybersecurity, intelligence, artificial intelligence (AI), data analytics, digital government, defense, and national security. Notably, he became the first Japanese recipient of the CASO certification, a prestigious OSINT accreditation. He has further demonstrated his expertise by competing in DEFCON Trace Labs OSINT CTF, a globally recognized hacking competition. In 2023, he was appointed as an Executive Officer at GMO Cybersecurity by Ierae. Additionally, he is actively engaged in cutting-edge research in the fields of cyber and AI at academic institutions. His professional qualifications include certifications such as CISSP and CASO. Beyond his corporate achievements, he contributes to public, private, and academic sectors as a Cybersecurity Expert for Japan's Ministry of Internal Affairs and Communications and as a Visiting Researcher at Meiji University's Cybersecurity Research Institute.

Daiki Fukumori

Joined a major domestic security company in 2002, engaging in a wide range of roles including the development of fraud detection systems, incident response team operations, and security assessments for web applications. In 2006, participated in the founding of a cybersecurity company and served as its Chief Technology Officer (CTO).
In 2014, became the first private-sector professional worldwide to be seconded to INTERPOL's Cybercrime Division. In this role, actively participated in cybercrime investigations while also providing technical guidance to cybercrime investigators from INTERPOL member countries and regions.

Shungo Kumasaka

Shungo Kumasaka brings his expertise in SOC infrastructure development and operations to GMO Cybersecurity by Ierae, where he joined in 2022 as a founding member of the SOC team. Prior to this, he honed his skills working on SOC infrastructure development and operations at a major telecommunications company. His current focus centers on developing foundational SOC systems. In addition, Kumasaka leverages his deep understanding of SOC threat intelligence to develop hands-on security training content designed to provide practical learning experiences. He is a Certified Information Systems Security Professional (CISSP).
CISSP.

Ryo Aihara

Ryo Aihara brings a wealth of experience in establishing and managing security services to his current role, which he assumed in 2023. Previously, he spearheaded the implementation of key security services, including NOC and cloud services, at a telecommunications provider. Currently, Aihara is immersed in SOC operations, while simultaneously developing and managing SOC infrastructure leveraging cloud services.
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Yoshihiro Nakazato

Yoshihiro Nakazato possesses a strong foundation in both infrastructure operations and security operations. His career began with managing infrastructure for hosting and in-house cloud services at a telecommunications provider. Building on this experience, he transitioned to launching SOC services. 
He currently leverages his combined expertise to handle SOC operations, as well as the development and management of SOC infrastructure.

Yuya Asato

Yuya Asato is a skilled penetration tester with a background in web application security. He began his career conducting web application vulnerability assessments before transitioning to penetration testing in 2020. Asato performs penetration tests across a range of environments, specializing in cloud-based systems. His work centers on identifying and addressing security vulnerabilities within client environments, ultimately strengthening their overall security posture.
Qualifications: CISSP / OSEP / Azure Security Engineer Associate / AWS DevOps Engineer - Professional / Google Cloud Security Engineer

Masahiro Kawada

Masahiro Kawada is a skilled penetration tester specializing in red teaming engagements, a role he has held since 2020. His work encompasses a wide range of responsibilities, including tool development, security research, and vulnerability investigation. Within red team projects, Kawada is known for his expertise in OSINT investigations, phishing simulations, social engineering exercises, and assessments of Mac environments and zero-trust architectures.

Daiki Takahashi

Daiki Takahashi leverages his diverse background in cybersecurity to provide expert CSIRT development support and consulting services. His experience spans sales, forensic investigation engineering, and hands-on CSIRT operations, providing him with a well-rounded perspective on organizational security. 
Currently, Takahashi specializes in corporate security governance, helping organizations establish and enhance their security postures.
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Kazuki Onishi

Kazuki Onishi is a skilled software engineer with a passion for cybersecurity. He joined Sakura Internet Inc. in 2017 as a new graduate, where he gained valuable experience in the operation, development, and research of cloud services.
In 2022, he transitioned to his current role as a core member of the development team for the "GMO Attack Surface Management" engine. Onishi thrives in handling a wide range of responsibilities, covering all layers from infrastructure to backend and frontend, including design, development, and operations. His contributions extend to vulnerability research, patch analysis, and exploit investigation, playing a key role in formulating effective implementation strategies.

Shouji Baba

Shouji Baba is a highly skilled security professional specializing in advanced web assessments and penetration testing. He brings a proven track record of uncovering critical vulnerabilities, both in his professional engagements and personal endeavors. At work, Baba primarily focuses on complex web application assessments and penetration testing, occasionally taking on challenging projects involving IoT and other unique technologies. He also contributes to the development of the "GMO Web App Scanning" engine, further strengthening its capabilities. Beyond his professional work, Baba is an active participant in bug bounty programs, where he has unearthed numerous high-severity vulnerabilities. Throughout his career, he has discovered hundreds of vulnerabilities, demonstrating his exceptional skills and dedication to improving security.
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Keitaro Yamazaki

Keitaro Yamazaki began his career at LINE Corporation in 2018, focusing on security risk assessment before transitioning to his current role in 2020, where he specializes in advanced web-related assessments and penetration testing.
With over a decade of active participation in CTF competitions since his student days, resulting in numerous awards, he continues to apply his competitive expertise to professional work, successfully identifying zero-day vulnerabilities in both professional assessments and CTF events.

Activities

• 2017-2019 CODE BLUE CTF Management and Problem Creation
• 2022-2023 Information-technology Promotion Agency (IPA) Security Camp Lecturer

Awards

• 2012 - 2023 SECCON Finals appearances 7 times
• 2014 - 2023 DEF CON CTF Finals appearances: 5 times (1st in Japan)
• 2017 Google CTF 2017 Final 4th place (1st place in Japan)
• 2022 Google CTF 2022 7th place (1st place in Japan)
• 2023 Midnight Sun CTF 2023 Final Runner-up

Yutaka Watanabe

Qualifications held

• Offensive Security Web Expert (OSWE)

Activities

• 2017-2019 SECCON Beginners Organizer/Instructor

Publishing and Writing

• Application Vulnerability Assessment Guidelines Version 1.2
• Detailed explanation of security contest (co-author)
• Cybersecurity Red Team Practice Guide (Co-edited translation) etc.

skills of a person

Web, machine code analysis, information security technology, penetration testing

Awards

• 2013 SECCON CTF Finals 2012 2nd place
• 2016 SECCON CTF 2015 Finals Participation
• 2023 DEF CON Cloud Village CTF Winner, etc.

Nishitani Kanta

Qualifications held

• Offensive Security Web Expert (OSWE)

Publishing and Writing

• Hands-on WebAssembly - Learn how to develop WebAssembly applications using Emscripten and C++
• Application Vulnerability Assessment Guidelines, Version 1.2, etc.

skills of a person

Web, machine code analysis, information security technology, penetration testing

Awards

• 2017 SECCON 2017 National Finals 3rd place
• 2018 Bugcrowd Atlassian Hall of Fame 4th place (1st place in Japan)
• 2018 Cybozu Vulnerability Bounty Program Ranking #1
• 2019 Cybozu Vulnerability Bounty Program Ranking 2nd
• 2023 DEF CON Cloud Village CTF Winner

Shinsuke Hamada

Awards

• 2019 Google CTF 2019 10th place (1st in Japan) (Team member)
• 2019 Baidu CTF 1st place (Team member)
• 2018 WCTF 2018 1st place (Team members) and others

Kazuaki Ito

skills of a person

Experienced in web log analysis, consulting, and project management.

Project track record

Extensive management experience across a wide range of projects, from startups to national clients, spanning various industries such as information magazine, e-commerce, and manufacturing. Expertise includes system development and operations, marketing, and business management.