B.TECH - Semester 8 cryptography and networks security Question Paper 2021 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Explain the difference between a unconditionally secure cipher and computationally secure cipher.
- Explain the parameters and design choices that determine the actual algorithm of Fiestel cipher.
- What is the difference between confusion and diffusion?
- Prove that $[(\mathrm{a} \bmod \mathrm{n})-(\mathrm{b} \operatorname{modn})] \bmod \mathrm{n}=(\mathrm{a}-\mathrm{b}) \bmod \mathrm{n}$.
- What is a trapdoor one way function?
- Explain elliptic curve cryptography.
- What are the properties of a digital signature?
- Why is the segmentation and reassembly function in PGP needed?
- What are the services provided by IPSec?
- What is a dual signature and what is its purpose? ( $10 \times 4=40$ Marks) P.T.O. Answer one full Question from each module. Each full question carries 20 marks.
- Explain AES Encryption algorithm.
- (a) Explain the different substitution techniques used in cryptography.
- (b) Discuss about the strength of DES.
- (a) Explain about public key cryptosystems. What are its applications?
- (b) Discuss MD5 hash algorithm.
- (a) Discuss the applications of message authentication codes and hash functions.
- (b) Explain elliptic curve cryptography.
- (a) Discuss about any three types of firewalls.
- (b) What do you mean by transport layer security?
- (a) Explain the different modes of IPSec operation.
- (b) What are encrypted tunnels? ( $3 \times 20=60$ Marks)