KERALA UNIVERSITY Class 7 cryptography Question Paper 2008

Practice authentic previous year questions for better exam preparation.

Sample Questions

Prove that $(a+b) \bmod n=(a \bmod n+b \bmod n) \bmod n$.
Let $Z_{n}$ denotes set of non-negative integers less than $n\left(Z_{n}=\{0,1, \ldots, n-1\}\right)$. Prove that $Z_{8}$ does not have multiplicative inverse for all elements.
Define Congruence class modulo $m$.
Define discrete logarithm (DL) problem. What is the role of DL problem in cryptography?
Discuss the advantages and disadvantages of stream cipher.