Cryptography & Network Security (CNS) AKTU predicted paper 2026-27
AI-predicted paper for Cryptography & Network Security based on 10 past papers (2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026). NOT an official AKTU paper. Use as a revision tool only.
Paper pattern
- Section A: Attempt all questions. (14 marks)
- Section B: Attempt any THREE questions out of five. (21 marks)
- Section C: Attempt ONE question from each pair (a or b). (35 marks)
Why these questions
- Unit 2 (Mathematical Foundations, AES and Public Key Cryptography) dominates — 23% avg weightage
- Asked every year: Secure Hash Algorithm (SHA)
- Due for comeback: Cryptanalysis, Modular Arithmetic
- Low priority (never asked): Block Cipher Principles, Differential Cryptanalysis
- Most repeated topic: IP Security
Section A – 2-mark questions
- Differentiate between Substitution & Transposition Cipher?
- Determine GCD of (1970, 1066) using Euclid’s algorithm.
- Write a short note on Secure Hash Algorithm (SHA).
- Write role of TGS.
- Write requirement of padding in ESP.
- State Chinese remainder theorem.
- Write a short note on Data Encryption Standard (DES).
Section B – sample questions
- Compare Substitution and Transposition techniques.
- Discuss the working of DES in detail with suitable diagram.
- Explain modular arithmetic and Extended Euclidean Algorithm with example.