Web technology basics you must know

An introductory course on web hacking for information security beginners and web developers! Start web hacking in a fun way with this course!

The basic steps to learn SQL injection attacks, the flower of web hacking! This is a lecture on basic SQL grammar!

This lecture covers the king of client attacks, XSS (Cross-Site Scripting). You can systematically learn about the basic concepts of XSS, the attack principles, and most importantly, what process to go through to perform the attack procedure.

A web hacking course where you can learn, practice, and understand the principles by simply following along with WebGoat problem solving!

Introduction to web hacking and mock hacking for those who are new to web hacking and job seekers in related fields

Web shell is the core tool for file upload vulnerability attacks! Let's learn how to create a web shell together through this lecture~!

The ultimate boss of web hacking! File upload vulnerability attack techniques! Following Part 1, this Part 2 'Chapter 1' training covers more in-depth and advanced techniques.

The ultimate web hacking! File upload vulnerability attack technique! Following Part 1, Part 2 '3rd part' education covers more advanced techniques in depth.

The ultimate web hacking! File upload vulnerability attack technique! Part 2 of the '2nd part' education follows Part 1 and covers more advanced techniques.

The ultimate boss of web hacking! File upload vulnerability attack techniques! Following Part 1, this Part 2 'Chapter 1' training covers more in-depth and advanced techniques.

In this course, you will learn how to create secure web services.

We will take a closer look at the working principles through core theories and practices of the OAuth 2.0 protocol. And we will analyze the OAuth 2.0 protocol from the perspective of hacking and security.

The second lecture on SQL Injection, taught by a mock hacking practitioner! The first lecture covered the basics and the core principles of attacks, while the second lecture is about technical advanced attack techniques. Therefore, taking the first lecture is a must!

Basic understanding of web shells and web shell detection solutions, as well as attack methods and obfuscation techniques for bypassing them!

The ultimate web hacking master! File upload vulnerability attack technique! This is a training that will further improve the students' web hacking skills through a completely different approach from the existing known methods!

Easy-to-follow file download vulnerability attack techniques from web hacking beginners to practitioners! File download vulnerability attack techniques and advanced attack techniques used in practice! And how to apply secure coding!

SQL Injection, the flower of web hacking, explained by a mock hacking practitioner! Learn attack and defense at the same time.

The ultimate boss of web hacking! File upload vulnerability attack techniques! Following Part 1, this Part 2 'Chapter 1' training covers more in-depth and advanced techniques.

Anyone can easily learn basic web hacking techniques, as well as countermeasures at the source code level and advanced techniques to bypass and attack, through hands-on training using an application called DVWA, which is designed for web security education.

Introduction to web hacking and mock hacking for those who are new to web hacking and job seekers in related fields

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.

[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.

"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 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.