Скачать или смотреть CNS UNIT3 | In just 30 minutes | 100% PASS| MUST WATCH

In this video I have explained unit3 of cns of jntuh r22 and r18 in a easy way

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


TOPICS COVERED👇

1.CRYPTOGRAPHIC HASH FUNCTIONS :MESSAGE AUTHENTICATION
2.SECURE HASH ALGORITHM(SHA-512)
3.MESSAGE AUTHENTICATION CODE :AUTHENTICATION REQUIREMENTS
4.HMAC,CMAC
5.DIGITAL SIGNATURES
6.ELGAMAL DIGITAL SIGNATURE SCHEME
7.KEY MANAGEMENT AND DISTRIBUTION: SYMMETRIC KEY DISTRIBUTION USING SYMMETRIC AND ASSYMETRIC ENCRYPTION
8.DISTRIBUTION OF PUBLIC KEYS
9.KERBEROS,X.509 AUTHENTICATION SERVICE
10.PUBLIC- KEY INFRASTRUCTURE

1.CRYPTOGRAPHIC HASH FUNCTIONS :MESSAGE AUTHENTICATION
✅ What Is a Cryptographic Hash Function?
A cryptographic hash function is a mathematical function that takes any input message and produces a fixed-size output called a hash value or message digest.
Properties of Hash Functions:
1. Fixed length output (e.g., SHA-256 → 256 bits)
2. One-way (cannot get original message from hash)
3. Collision-resistant (hard to find two messages with same hash)
4. Fast to compute

















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