I am a penetration testing expert and content creator with over 25 years of hands-on experience in the field.
My specialties include:

Network hacking and web security

Hardening Linux-based servers and firewalls

Developing games and mobile applications using Unity3D and Torque2D

With a strong focus on real-world scenarios, I design practical, lab-based training that enables learners to think like an attacker and defend like a professional. My teaching goes beyond theory, equipping students with the mindset and technical skills needed to succeed in offensive security.

I have provided in-depth training for corporations, educational institutions, and government organizations — including the Cyber Crime Investigation Division of the Seoul Metropolitan Police Agency, South Korea.
My instruction covers everything from vulnerability assessments and penetration testing to firewall evasion techniques and incident response strategies.

I am committed to helping both developers and security professionals build real-world, actionable cybersecurity skills that matter in the field.