Download AKTU B-Tech 8th Sem 2016-17 ECS084 Cryptography And Network Security Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 8th Semester (Eight Semester) 2016-17 ECS084 Cryptography And Network Security Question Paper

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B.TECH.
THEORY EXAMINATION (SEM?VIII) 2016-17
CRYPTOGRAPHY & NETWORK SECURITY
Time : 3 Hours Max. Marks : 100
Note : Be precise in your answer. In case Ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Attempt the following: 10 x 2 = 20
(a) What is Security Attacks? Discuss its types.
(b) Find gcd (1970, 1066) using Euclid's algorithm.
(c) Explain in brief Symmetric and Asymmetric Cryptography.
((1) State the Fermat's theorem.
(e) What is Replay Attack?
(1') Differentiate between Substitution & Transposition Cipher?
(g) What is Steganography?
(h) Define Finite Field in form of GF (p).
(i) Find the value of (I)(12)
(j) Discuss Triple DES?
SECTION ? B
2. Attempt any five of the following questions: 5 x 10 = 50
(3) Using Fermat's theorem, find the value of 3201 mod 11.
(b) Discuss Group, Ring and Field.
(c) Discuss the design of S?Box of ABS. How it differs from the S-Boxes of DES.
(d) What is Linear Congrurential Generator? Let m = 10, a =5, 0 = 14 and X0 = 107 then
find 5 a series of 5 random numbers.
(e) What do you understand by Chinese Remainder Theorem? Solve by Chinese
Remainder Theorem:
(i) X E 2 mod 3
(ii) X E 3 mod 5
(1') What are the requirements of Message Authentication Code (MAC)? Explain HMAC
in detail with block diagram.
(g) Discuss Public Key Cryptosystem. Also explain RSA algorithm with suitable steps. Let
p = 17, q = 11, e = 7 and d = 23. Calculate the public key & private key and show
encryption and decryption for plain text M = 88 by using RSA algorithm
(h) Explain MDS Message Digest Algorithm in detail with suitable steps and block
diagram.
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
3 What is Digital Certificate? Discuss the X509 Digital Certificate Format. Also explain
the Revocation of X509 Digital Certificate.
4 What is Kerberos? Discuss Kerberos Version 4 in detail. Also differentiate it with
Version 5.
5 Write short notes on following:
(i) Firewall
(ii) SSL
(iii) S/MIME _
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