Information Technology course materials
Velammal College of Engineering and Technology, Madurai.
Department of Information Technology
ASSIGNMENT -I
YEAR/SEMESTER: IV/VII
Subject Code & Name: CS6701/Cryptography & Network Security
Questions
1. Find 11 13 mod 53 . [K3 –Apply] (CO1)
2. Find 321 mod 11 using Fermat’s theorem. [K3 –Apply] (CO1)
3. Using Euclidean algorithm calculate GCD (21,300) & GCD (125, 20) [K3 –Apply] (CO1)
4. Find GCD of (1403, 1081) [K3 –Apply] (CO1)
5. Explain Fermat’s little theorem and solve the following [K3 –Apply] (CO1)
(i) 15 18 mod 17 (ii) 5 27 mod 13
6. In a Chinese remainder theorem n=210, n1=5, n2=6 n3=7 and compute j -1 (3, 5, 2) i.e. given
x1=3, x2=5,x3=pute x. [K3 –Apply] (CO1)
7. Find gcd(1970, 1066) using Euclid’s algorithm. [K3 –Apply] (CO1)
8. Decipher the following cipher text using brute force attack: [K3 –Apply] (CO1)
CMTMTOOEOORW (Hint: Algorithm – Rail Fence)
9. Encrypt the following using the play fair cipher using the keyword MONARCHY. “SWARAJ IS MY BIRTH RIGHT”. Use X for blank spaces. [K3 –Apply] (CO1)
10. Encrypt the message “PAY” using Hill Cipher with the following key matrix and show the decryption to get the original plain text. [K3 –Apply] (CO1)
[pic]
11. Apply Caesar cipher and k=5 decrypt the given Cipher text “YMJTYMJWXNIJTKXNQJSHJ”.
[K3 –Apply] (CO1)
12. Apply Vigenere cipher; encrypt the word “explanation” using the key “leg”. [K3 –Apply] (CO1)
Submission Date: 08.08.2017
Course Incharge Module Coordinator Verified By
Mr.P.Suresh Babu Dr.R.Perumalraja HoD/IT
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