Simple DES & SDES Explained in Tamil | Cryptography & Cyber Security Basics 🛡️

CB3491 Lectures in Tamil

UNIT I INTRODUCTION TO SECURITY

Computer Security Concepts – The OSI Security Architecture – Security Attacks – Security Services
and Mechanisms – A Model for Network Security – Classical encryption techniques: Substitution
techniques, Transposition techniques, Steganography – Foundations of modern cryptography:
Perfect security – Information Theory – Product Cryptosystem – Cryptanalysis.

UNIT II SYMMETRIC CIPHERS

Number theory – Algebraic Structures – Modular Arithmetic – Euclid‘s algorithm – Congruence and
matrices – Group, Rings, Fields, Finite Fields SYMMETRIC KEY CIPHERS: SDES – Block Ciphers – DES, Strength of DES – Differential and
linear cryptanalysis – Block cipher design principles – Block cipher mode of operation – Evaluation
criteria for AES – Pseudorandom Number Generators – RC4 – Key distribution.

UNIT III ASYMMETRIC CRYPTOGRAPHY

MATHEMATICS OF ASYMMETRIC KEY CRYPTOGRAPHY: Primes – Primality Testing –
Factorization – Euler’s totient function, Fermat’s and Euler’s Theorem – Chinese Remainder
Theorem – Exponentiation and logarithm
ASYMMETRIC KEY CIPHERS: RSA cryptosystem – Key distribution – Key management – Diffie
Hellman key exchange -– Elliptic curve arithmetic – Elliptic curve cryptography.

UNIT IV INTEGRITY AND AUTHENTICATION


Authentication requirement – Authentication function – MAC – Hash function – Security of hash
function: HMAC, CMAC – SHA – Digital signature and authentication protocols – DSS – Schnorr
Digital Signature Scheme – ElGamal cryptosystem – Entity Authentication: Biometrics, Passwords,
Challenge Response protocols – Authentication applications – Kerberos
MUTUAL TRUST: Key management and distribution – Symmetric key distribution using symmetric
and asymmetric encryption – Distribution of public keys – X.509 Certificates.

UNIT V CYBER CRIMES AND CYBER SECURITY


Cyber Crime and Information Security – classifications of Cyber Crimes – Tools and Methods –
Password Cracking, Keyloggers, Spywares, SQL Injection – Network Access Control – Cloud
Security – Web Security – Wireless Security