Study guide
CSS411 Cryptography and Network Security. Revision notes for the exam.
1 min read
These notes cover the 22 lecture PDFs of the course in LMS order, and the 6 PDFs of extra notes and sample problems. Read a lecture. Answer its self-test. Then mark the lecture as done. The sidebar shows your progress.
Foundations
Security goals, services, attacks, and the classical ciphers that started it all.
Symmetric ciphers
S-DES, DES, AES, finite fields, MixColumns and the modes of operation.
Public-key ciphers
RSA, Diffie-Hellman and elliptic curve cryptography.
Integrity & signatures
Hash functions, SHA, the Digital Signature Standard and HMAC.
Keys & authentication
Key management, user authentication and Kerberos.
Network security
PGP, SSL/TLS and IPSec.
Extra notes
Reference notes chapters and worked sample problems.
Cheat sheet
One page for last-minute revision.
Past exam questions
Mid-sem and end-sem 2025 questions with marks and model answers.