Where Do Hackers Get In? An Introduction to Security Without Code

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.

This is mandatory company-wide information security training that helps employees internalize, through real-world examples, the security threats encountered in everyday work—from arriving at work to leaving for the day, starting with a single click or a single document—and the latest security practices for 2026, without difficult IT jargon.

Have you heard of information security solutions, but do you know their exact roles and differences? A variety of information security solutions are used by businesses, including firewalls, IDS, IPS, WAF, DLP, and EDR! Precisely understanding the role each one performs, how it works, and in what situations it is used is an important first step toward developing your information security skills. A complete beginner’s guide to information security solutions (systems) that anyone can easily learn! Learn complex security technologies easily and systematically, starting from the basics.

This is a lecture [Certification and Practice (Security · Network), Security] prepared for beginners.

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

This course puts an end to operational vulnerabilities on Linux servers caused by incorrect permissions. Master file and directory permission control completely based on real-world practices.

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

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 the adoption of generative AI accelerates, new security threats such as corporate confidential information leaks and prompt injections are surging. This course covers strategies for embedding security throughout the entire AI lifecycle, based on the National Intelligence Service (NIS) guidelines' 30 core security measures and 15 practical threat cases. It also addresses security issues in the latest AI trends, such as Agentic AI and Physical AI, and presents methods for establishing governance frameworks that can be immediately applied in practice.

This course carefully selects the core systems that beginners need to know in the vast field of information security. Rather than relying on rigid theory, it uses clear analogies and practical examples to help you intuitively understand how these systems work. With this single course, you can grasp the big picture of information security systems and build practical skills.

Records remain, and responsibility grows! Everything about digital ethics that protects the workplace This course explores digital hate, digital sex crimes, and the risks of using AI that can actually occur in the workplace through case-based stories, clearly explaining what the problems are and how to prevent and respond to them. It firmly establishes the standards of digital ethics that today’s employees—who communicate digitally and use AI as part of their everyday work—urgently need, including how to work while respecting one another in digital spaces and how to use AI more safely and responsibly.