Why Cybersecurity Knowledge Matters
With over 2,200 cyberattacks happening every day, cybersecurity is one of the most critical fields of the 21st century. Understanding security concepts helps you protect yourself online and prepares you for tech careers.
Types of Cyber Threats
- 🎣 Phishing — Fraudulent emails/messages impersonating legitimate entities to steal data.
- 🔒 Ransomware — Malware that encrypts files and demands payment for decryption key.
- 🐴 Trojan Horse — Malicious software disguised as legitimate program.
- 🦠 Virus — Self-replicating code that attaches to legitimate files.
- 🌊 DDoS Attack — Distributed Denial of Service; overwhelming servers with traffic.
- 🕵️ Man-in-the-Middle (MITM) — Attacker secretly intercepts communication between two parties.
- 💉 SQL Injection — Inserting malicious SQL code into a web form to access/manipulate databases.
- 🔐 Zero-Day Exploit — Attack targeting previously unknown software vulnerability before patch is available.
Encryption Basics
- 🔑 Symmetric encryption — Same key for encryption and decryption (AES, DES).
- 🔑🔓 Asymmetric encryption — Public key encrypts; private key decrypts (RSA, ECC).
- 🔐 HTTPS — Uses TLS/SSL to encrypt web communications; indicated by padlock in browser.
- #️⃣ Hashing — One-way transformation of data (MD5, SHA-256); used for password storage.
- 🛡️ 2FA/MFA — Two/Multi-Factor Authentication adds second layer of verification beyond password.
Famous Cyberattacks
- 💰 WannaCry (2017) — Ransomware infected 200,000+ computers in 150 countries; caused $4 billion in damages.
- 🔋 Stuxnet (2010) — First known cyber weapon; targeted Iranian nuclear centrifuges.
- 🎰 Yahoo! Data Breach (2013-2016) — 3 billion accounts compromised; largest data breach in history.
- 🏦 Bangladesh Bank Hack (2016) — $81 million stolen via SWIFT banking system.
50 Cybersecurity Quiz Questions
- What does VPN stand for? (Virtual Private Network)
- What is the most secure type of password? (Long, random combination of letters, numbers, and symbols)
- What does HTTPS stand for? (HyperText Transfer Protocol Secure)
- What is a firewall? (Security system that monitors and controls network traffic based on rules)
- What is social engineering in cybersecurity? (Manipulating people into revealing confidential information)
- What does malware mean? (Malicious software — software designed to harm or exploit)
- What is a "white hat" hacker? (Ethical hacker who tests systems with permission to find vulnerabilities)
- What port does HTTPS typically use? (Port 443)
- What is a botnet? (Network of infected computers controlled remotely by attackers)
- What is the most common default router password? ("admin" or "password" — which is why you should always change defaults!)
