Hacking as a Hobby #2 (Hacker's Computing)

This is a free special lecture that can help you strengthen your information security and personal information protection capabilities.

Episodes from the year I started from scratch to stand on my own after quitting my dream job.

You can clear all the challenges of the international hacking competition SquareCTF (2018~2019). Broaden your senses and perspectives on IT and security by experiencing various challenges!

You can clear all the challenges of the hacking competition SquareCTF (2017).

You can clear all the preliminary challenges of the hacking competition DIMICTF (2019).

While tackling Nebula, a wargame designed to develop system hacking skills, I have included a complete translation and solutions for all challenges, including the setup of the practice environment from start to finish. Additionally, you can acquire the computer science knowledge required for each challenge.

Covering the content of WebGoat, a classic web hacking wargame, this resource includes full translations and solutions for every lesson and challenge from start to finish. It provides everything from setting up the practice environment to the tools and data required to solve the challenges.

If you have ever felt attracted to someone typing mysterious Linux commands on a black screen but felt lost on where or how to start, this course can help you.

Covering the content of WebGoat, a classic web hacking wargame, this resource includes full translations and solutions for every lesson and challenge from start to finish. It provides everything from setting up the practice environment to the tools and data required to solve the challenges.

You can clear all the preliminary challenges of the hacking competition DIMICTF (2019).

This lecture provides a general guide on how to prepare while studying when you want to choose a career in IT security penetration testing, and what questions and answers to prepare for the interview. I will share my experience working as a penetration testing consultant, at large companies, and in the financial sector, and currently running a penetration testing consulting business.

"Understanding Manufacturing Security in the AI Era through Field Cases" is a course designed to provide an easy understanding of OT security, which is growing in importance within smart factories and AI-based manufacturing environments, focusing on real-world field cases. This lecture explains core concepts frequently encountered in manufacturing sites, such as OT, ICS, PLC, SCADA, HMI, and MES, and compares the differences between IT security and OT security. Furthermore, it examines security threats that can occur on the manufacturing floor—such as ransomware, remote access exploitation, partner account hijacking, production line shutdowns, equipment malfunctions, and data forgery—through case studies. Through this course, students will understand the basic structure of OT security in manufacturing and identify the security perspectives necessary to protect production facilities and industrial control systems. Additionally, it provides a common foundation for further learning in industry-specific manufacturing security courses.

This is a course where you can learn the basics of web technology. You can learn the basics of web technology in a short period of time. If you are interested in studying or getting a job related to the web, you must take this course!

[Introduction to Security Incident Response: Learning through Scenarios of Web Server Hacking, Ransomware, and Account Takeover] This course examines why various information security incidents—such as web server hacking, ransomware, account takeover, and internal penetration—occur and how they spread, categorized by incident type. Students will follow each incident scenario to understand the attack flow, analyze the core causes of the incident, and learn how to resolve issues and prevent recurrence through security architectures such as firewalls, DMZ, access control, privilege management, backup, and log monitoring. Rather than a simple explanation of security concepts, this is a scenario-based introduction to information security that provides a comprehensive understanding from root cause analysis to resolution strategies.

IT services are rapidly transitioning to cloud environments. You will learn security practices from basic virtual infrastructure construction to security threat monitoring and vulnerability diagnosis for each area to secure the Amazon AWS cloud environment.