Chapter 1
Introduction of Information & Network Security
Created by: Jainam Gandhi
What is Security?
● Security = Protecting assets from threats.
Think of it like:
○ 🔒 Locking your phone to stop strangers from accessing your photos.
○ 🛡️ Wearing a helmet while riding a bike to prevent head injuries.
● In the digital world:
○ "Security means ensuring data confidentiality (only authorized people see it),
integrity (data isn’t tampered with), and availability (data is accessible when
needed)."
● Real-World Example:
Imagine your Instagram account:
○ Confidentiality: DMs are encrypted so only you & the recipient read them.
○ Integrity: No one can alter your posted photos without your password.
○ Availability: Instagram’s servers resist crashes during high traffic (like IPL
season!).
1
,Need of Security
● Why can’t we ignore security?
● 📉 Risks Without Security:
● 💡 Why YOU Need Security Knowledge:
○ Personal Safety:
■ UPI frauds increased by 18% in Gujarat (2023). Without security,
your ₹500 recharge could become ₹50,000 debt!
■ Example: Fake "GTU Result" SMS with malware links.
○ Professional Demand:
■ India needs 1.5 million cybersecurity pros by 2025 (NASSCOM).
Learning this = high-paying jobs 💰.
2
, ○ Tech Trends:
■ AI-Powered Attacks: Hackers use ChatGPT to write malicious code.
■ IoT Risks: Your smart watch/tv can be hacked to spy on you (e.g.,
baby monitor breaches).
● Following are certain aspects for the need of security :
1. Increasing threat of attacks.
2. Fast growth of computer networking for information sharing.
3. Availability of a number of tools and resources on the Internet.
4. Lack of specialized resources that may be allotted for securing the system.
3
, 1.1 Computer Security, Cyber Security, Information
Security and Network Security
➔ Computer Security
◆ Definition:
● Protecting individual computing devices (laptops 💻 , phones 📱 ,
servers) and their data from unauthorized access, theft, or damage.
● "Safeguarding hardware, software, and data on standalone systems
through tools like antivirus, firewalls, and access controls."
● "Protecting your laptop/phone from viruses, hackers, or physical theft
– like a digital lock for your device."
◆ Importance:
● In today’s world, where everything runs on data, it's very important
to keep personal and important information safe from hackers. If
someone gets access to that data, they can misuse it in harmful
ways.
● Computer security helps in two big ways:
1. It protects important data from being stolen or damaged.
2. It keeps your computer running smoothly, without problems
caused by viruses or malware.
4
Introduction of Information & Network Security
Created by: Jainam Gandhi
What is Security?
● Security = Protecting assets from threats.
Think of it like:
○ 🔒 Locking your phone to stop strangers from accessing your photos.
○ 🛡️ Wearing a helmet while riding a bike to prevent head injuries.
● In the digital world:
○ "Security means ensuring data confidentiality (only authorized people see it),
integrity (data isn’t tampered with), and availability (data is accessible when
needed)."
● Real-World Example:
Imagine your Instagram account:
○ Confidentiality: DMs are encrypted so only you & the recipient read them.
○ Integrity: No one can alter your posted photos without your password.
○ Availability: Instagram’s servers resist crashes during high traffic (like IPL
season!).
1
,Need of Security
● Why can’t we ignore security?
● 📉 Risks Without Security:
● 💡 Why YOU Need Security Knowledge:
○ Personal Safety:
■ UPI frauds increased by 18% in Gujarat (2023). Without security,
your ₹500 recharge could become ₹50,000 debt!
■ Example: Fake "GTU Result" SMS with malware links.
○ Professional Demand:
■ India needs 1.5 million cybersecurity pros by 2025 (NASSCOM).
Learning this = high-paying jobs 💰.
2
, ○ Tech Trends:
■ AI-Powered Attacks: Hackers use ChatGPT to write malicious code.
■ IoT Risks: Your smart watch/tv can be hacked to spy on you (e.g.,
baby monitor breaches).
● Following are certain aspects for the need of security :
1. Increasing threat of attacks.
2. Fast growth of computer networking for information sharing.
3. Availability of a number of tools and resources on the Internet.
4. Lack of specialized resources that may be allotted for securing the system.
3
, 1.1 Computer Security, Cyber Security, Information
Security and Network Security
➔ Computer Security
◆ Definition:
● Protecting individual computing devices (laptops 💻 , phones 📱 ,
servers) and their data from unauthorized access, theft, or damage.
● "Safeguarding hardware, software, and data on standalone systems
through tools like antivirus, firewalls, and access controls."
● "Protecting your laptop/phone from viruses, hackers, or physical theft
– like a digital lock for your device."
◆ Importance:
● In today’s world, where everything runs on data, it's very important
to keep personal and important information safe from hackers. If
someone gets access to that data, they can misuse it in harmful
ways.
● Computer security helps in two big ways:
1. It protects important data from being stolen or damaged.
2. It keeps your computer running smoothly, without problems
caused by viruses or malware.
4
