What Is Security?
Security means protecting information from theft, tampering, and destruction. Learn the three pillars (Confidentiality, Integrity, Availability) with real-world examples .
Security Articles
20 articles · in orderWhat Do Hackers Actually Do?
Not all hackers are criminals. White-hat hackers protect companies from attack. This article explains the three types of hackers and what they really do, with diagrams.
7 Rules for an Unbreakable Password
The correct way to create account-protecting passwords, organized into 7 rules. Length, no reuse, password managers — explained with diagrams.
What Is Two-Factor Authentication?
An essential guard for the era when passwords alone can't protect you — two-factor authentication explained with diagrams. How it works, SMS vs. app vs. hardware key, and setup steps.
How to Spot Phishing Scams
When an email or SMS pretending to be Amazon or a bank arrives, how do you tell real from fake? Phishing scam tactics and detection checkpoints explained with diagrams.
How to Spot Fake Websites
Tips for seeing through fake shops and social-media lookalike sites — explained with diagrams. Five judgment points: URL, padlock, operator info, payment methods, and reviews.
Protecting Your Privacy on Social Media
In an era where a school uniform photo can reveal your name and nearest station, here are the privacy settings and posting tips students need to protect themselves and their families.
What Happens When Your Device Gets a Virus?
What actually happens when a PC or smartphone gets infected with malware? Takeovers, data theft, and ransomware demands — symptoms and responses explained with diagrams.
Is Public Wi-Fi Dangerous?
Is the free Wi-Fi at cafés and stations safe? Man-in-the-middle attacks, fake access points, and eavesdropping risks — plus how to use public Wi-Fi safely. Explained .
Are USB Drives Dangerous?
Plugging in a found USB drive can lead to virus infection. Learn about USB risks — autorun, loss, and BadUSB attacks — with illustrated safety tips.
Intro to How Cyberattacks Work
DDoS, SQL injection, zero-day, ransomware — learn how the cyberattacks you hear about in the news actually work, with illustrated explanations.
Why Do Data Leaks Happen?
Data leaks are in the news every day — and most are caused not by hackers but by human error. Learn the main causes and how to protect your data, illustrated with diagrams.
Intro to Encryption
HTTPS, LINE's E2EE, and password storage. Learn how encryption — symmetric vs. asymmetric key cryptography — powers the services you use every day, illustrated with diagrams.
Online Crime Methods to Watch Out For
Tech support scams, SNS account hijacking, crypto fraud, impersonation. Learn the most common online crime tactics targeting young people, with illustrated tips on how to spot and avoid them.
Cybercrime in the AI Era
Deepfakes, voice cloning, AI-generated phishing. Learn how AI has upgraded cybercrime tactics and why 'verify by channel and passphrase' is the new defensive baseline.
Staying Safe on School PCs
Chromebooks, iPads, shared computers — learn how to use school devices safely. Login management, browsing history, USB rules, and activity logs explained with diagrams.
How to Protect Your Home PC
Eight essential defenses to keep your home PC safe. OS updates, antivirus, backups, router settings — illustrated in priority order.
What Is a White-Hat Hacker?
White-hat hackers use attack skills to defend — not harm. Learn what they do, what they earn, and how you can start the journey, with illustrated salary ranges and a roadmap.
How to Become a Security Engineer
Security engineers are in high demand. Learn the different specialties, required skills, education paths, and certifications — illustrated with a beginner roadmap.
What Security Certifications Are There?
From the IT Passport to CISSP and OSCP — a guide to security certifications by difficulty, cost, and study time, with a recommended 3-step path.