Wireshark Packet Analysis: Learning from Network Fundamentals

Why do so many people fall for phishing attacks? In this lecture, we will examine how phishing is designed and executed through real-world attack cases, understand various types including smishing, QR phishing, and corporate-targeted attacks, and summarize prevention and response methods from a practical perspective.

Ransomware incidents start with a single email and a single click. Even if you are not a security major, we will explain everything from the principles of ransomware to prevention and response in one go, based on actual infection flows and incident cases.

Virtual assets and cryptocurrencies have driven financial innovation, but they are also being used as tools for crime, money laundering, and data breaches. This course starts with the basic concepts of virtual assets and blockchain, tracks actual cryptocurrency transaction flows, and analyzes suspicious fund movement structures.

Open-Source Intelligence (OSINT) plays a critical role in cybersecurity and threat intelligence. This practical, hands-on OSINT expert course covers everything from Dark Web environment setup and OSINT fundamentals to information gathering tools, as well as information analysis and automation using LLMs.

As AI systems become agentic and expand beyond text into image, audio, and multimodal capabilities, security threats are becoming significantly more complex. This lecture analyzes the latest security threats and attack techniques faced by AI Agents and Multimodal LLMs, as well as real-world cases, from an AI Red Teaming perspective.

As AI rapidly permeates daily life and industries, attack techniques targeting these systems are evolving alongside them. This course is a practical, hands-on program designed to help you understand the latest security threats surrounding Generative AI and LLMs, automate security tasks using AI, and experience LLM jailbreak attacks and defenses firsthand.

In the rapidly changing era of AI, IoT, metaverse, and blockchain, understanding technology alone is not sufficient. This course is an introductory guide designed to help you easily identify the security risks brought by the latest digital technologies in just 1 hour. With easy explanations that can be understood even without technical background knowledge and a composition centered on real-world cases, you can organize the security points you must know in the next-generation digital environment all at once.

This course is a practical guide that concisely summarizes the essential organizational security knowledge that everyone working in a company must know. From remote work security to in-house PC and data management, and IT outsourcing security—you can quickly learn the most realistic practical principles to prevent security incidents that actually occur in the workplace. Even if you're not a security officer and have no specialized knowledge, you can learn security habits and checklists that can be immediately applied to your work.

This course is an essential real-life IT security guide that even non-security majors and general users can follow immediately. It's designed to help you easily and quickly learn only the security practices essential for daily life, from understanding what ransomware is to infection prevention and response methods, smartphone security settings, and practical security configurations for Windows/Mac OS.

When providing global services or handling overseas customer data, knowing only domestic laws is no longer sufficient. This course is an introductory program that organizes the core structures of major global privacy protection laws at a glance within 30 minutes. It's designed to help you understand by comparing privacy protection laws by country, including GDPR, CCPA, APPI, PIPA, PDPA, and others. Additionally, you can briefly explore global data security regulations such as HIPAA, PCI DSS, and APEC CBPR, as well as emerging privacy protection issues in AI environments and trends in guaranteeing data subject rights.

This is an introductory course designed so that even people encountering information security and personal data protection for the first time can understand the overall flow within an hour. From security concepts to practical methods in daily life, and even the core content of Korea's Personal Information Protection Act (PIPA), only the essential parts are organized in an easy and simple way. Even without security knowledge, after listening, you'll naturally acquire the basics of safely handling personal information in daily life and work.

Network packet analysis is essential when conducting incident analysis and vulnerability analysis. Among the tools available, Wireshark is the most widely used, and this course covers the complete utilization of Wireshark and provides understanding through incident analysis case studies.

The PNT course is a follow-up to the BHPT course, designed as a hands-on program where students learn the concepts of pivoting and tunneling required for lateral movement and perform lateral movement themselves through practice labs. Students will understand pivoting techniques to bypass firewalls by manipulating network traffic and master methods for crossing boundaries in various network environments.

This course is for those who want to develop packet analysis programs like Wireshark and various network solutions using the Npcap library.

This course is designed to guide those who have completed the "Mastering Core Network Theory through Memorization: Basic Course" to understand more advanced theories. It covers deeper concepts such as NAT technology, which is the operating principle of internet routers, as well as load balancing system principles and VPN technology principles. The goal of this lecture is also to finish by "memorizing" it all! You can do it!

This course is designed to learn the fundamentals of networks that form the foundation of the internet. It is structured to help you understand the basic concepts and structure of networks and systematically learn the principles of internet communication. Learners will acquire foundational theoretical and practical knowledge about networks, establishing a foundation for learning in the IT and information communication fields.

From TCP/IP to HTTP! This course is prepared for those who lack basic network theory but hope to understand major-level concepts, even if it means "memorizing" them. You can do it!

Arduino? Coding? You don't need to know anything. Just invest a little bit of your free time and you'll find something amazing.

A course where you can understand core network concepts and train to explain them verbally for interviews.

[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.

Learn about networks easily, quickly, and engagingly with pictures and videos!

This is a course where you create a mini RPG 2D game to learn 2D development techniques, and then learn the process of converting the completed game into a network game by transitioning it to Netcode for GameObject. It covers various essential tilemap functions for 2D games, and is designed to naturally help you learn clean code writing techniques that adhere to SOLID principles. Additionally, this is a lecture that builds the foundation for network games using the updated Netcode API in the latest Unity 6 version.

This is a hands-on introductory course for AWS cloud beginners that follows and learns basic AWS cloud network knowledge.

✅ Among the series of (1) ~ (7), (7) web applications, networks, clouds, WWW, information security ✅ CS101 series lectures - From basic computer theory to the latest practical examples - Provides a wide range of basic knowledge

This course will help you understand the value of IoT and how it changes our lives and society. You will learn the basics of IoT device programming, IoT device connection technology, big data analysis, and automation. You will understand digital transformation and its impact on businesses and society.

KCA Information Security Risk Manager (ISRM) certification course! The cornerstone for acquiring the top 3 personal information protection certifications: CPPG, ISMS-P!

Creating a simple Omok game using Unity and a C# server

If you want to work for a long time as a super developer who can handle the entire process of service development and operations alone, building a solid foundation in IT infrastructure knowledge is just as important as learning various programming languages!

We have gathered all the essential network theories that those planning to operate services in an AWS environment must know. Through this course, you can understand the principles of how AWS VPC (Virtual Private Cloud), composed of private networks using Private IPs, works and gain a detailed understanding of the roles of services such as ALB and NLB.

Repeatedly study the 100 most frequently appearing CPPG core topics through theory, mind maps, and problem solving.

Network studies that you give up on every time because they are difficult and boring. Finish it once and for all with this textbook.