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📘 Week 1: Introduction to Cybersecurity

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1️⃣ What is Cybersecurity?

📌 Definition:

Cybersecurity is the practice of protecting systems, networks, programs, and data from digital attacks.

It focuses on:

  • Preventing unauthorized access

  • Protecting sensitive information

  • Ensuring systems operate correctly

  • Defending against cyber threats

💻 What Needs Protection?

  • Personal data (passwords, banking info)

  • Company data (customer records, trade secrets)

  • Government information

  • Critical infrastructure (power grids, hospitals)

🚨 Why is Cybersecurity Important?

  • Cybercrime is increasing globally

  • Financial losses from cybercrime cost billions annually

  • Businesses can shut down after major attacks

  • Personal identity theft is common

🔐 Common Cyber Threats

  • Malware

  • Phishing

  • Ransomware

  • Data breaches

  • Social engineering

2️⃣ The CIA Triad

The CIA Triad is the foundation of cybersecurity.

🔒 1. Confidentiality

Definition: Ensuring information is only accessible to authorized individuals.

Examples:

  • Password-protected accounts

  • Encryption of emails

  • Two-factor authentication

Real-world example:

Only HR should access employee salary data.

✔ 2. Integrity

Definition: Ensuring data is accurate and not altered without authorization.

Examples:

  • Hashing

  • Digital signatures

  • File permissions

Real-world example:

Bank balances should not be changed by hackers.

⏳ 3. Availability

Definition: Ensuring systems and data are accessible when needed.

Examples:

  • Backup systems

  • DDoS protection

  • System maintenance

Real-world example:

Hospital systems must be available 24/7.

🔺 How the CIA Triad Works Together

If one fails:

  • No confidentiality → Data leaks

  • No integrity → Data corruption

  • No availability → Service disruption

3️⃣ Types of Hackers

🟢 White Hat Hackers (Ethical Hackers)

  • Authorized professionals

  • Help organizations find vulnerabilities

  • Work legally

Example: Security consultants

🔴 Black Hat Hackers

  • Illegal hackers

  • Steal data, demand ransom

  • Create malware

Example: Ransomware attackers

🟡 Gray Hat Hackers

  • Break rules without permission

  • May not have malicious intent

  • Sometimes disclose vulnerabilities publicly

Other Categories

  • Script Kiddies (inexperienced hackers using ready-made tools)

  • Hacktivists (political/social motives)

  • Insider threats (employees)