CNS unit1 | In just 50 minutes | 100% PASS | SIMPLE Explanation

Описание: In this video I have explained unit1 of CNS JNTUH R22 AND R18 in a simple way.

NOTES LINK
https://notes-theta-eight.vercel.app/

SUBSTITUTION AND TRANSPOSITION TECHNIQUES VDO 👇
   • cns unit 1 cryptographic systems and types...  

TOPICS COVERED👇
1.SECURITY CONCEPTS :INTRODUCTION
2.THE NEED FOR SECURITY,SECURITY APPROACHES,PRINCIPLES OF SECURITY
3.TYPES OF SECURITY ATTACKS,SECURITY SERVICES,SECURITY MECHANISMS
4.A MODEL FOR NETWORK SECURITY
5.CRYPTOGRAPHY CONCEPTS AND TECHNIQUES :INTRODUCTION
6.PLAIN TEXT,CYPHER TEXT
7.SUBSTITUTION TECHNIQUES,TRANSPOSITION TECHNIQUES
8.ENCRYPTION AND DECRYPTION
9.SYMMETRIC AND ASSYMETRIC KEY CRYPTOGRAPGHY
10.STEGANOGRAPHY
11.KEY RANGE AND KEY SIZE
12.POSSIBLE TYPES OF ATTACKS

1.SECURITY CONCEPTS :INTRODUCTION
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🔐 UNIT: SECURITY CONCEPTS — INTRODUCTION
1. What is Security?
Security refers to protecting data, systems, and networks from unauthorized access, attacks, damage, or misuse.
The aim is to ensure that information remains Confidential, Accurate, and Available.
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2. Goals of Security (CIA Triad)
🔸 1. Confidentiality
• Ensures information is accessible only to authorized users.
• Prevents data leakage.
Example: Encryption, passwords.
🔸 2. Integrity
• Ensures information is accurate, complete, and unmodified.
• Protects data from unauthorized changes.
Example: Hash functions, checksums, digital signatures.
🔸 3. Availability
• Ensures information and services are available whenever required.
Example: Backup, load balancing, protection from DoS attacks.
















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