gs gs122 Cryptography - Polyalphabetic Cipher - Quiz No.1
gs gs122 Data Communication and Computer Network Quiz
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Question 1: Which of the following ciphers are created by shuffling the letters of a word?
rotor cipher
rail fence cipher
vigenere cipher
hill cipher
Question 2: Which of the following is a type of substitution cipher?
poly alphabetic cipher
transposition cipher
columnar cipher
rail fence cipher
Question 3: Which of the following correctly defines poly alphabetic cipher?
a substitution based cipher which uses multiple substitution at different positions
a substitution based cipher which uses fixed substitution over entire message
a transposition based cipher which uses multiple substitution at different positions
a transposition based cipher which uses fixed substitution over entire message
Question 4: Which of the following is not a type of poly alphabetic cipher?
Rotor cipher
Hill cipher
One time pad cipher
Affine cipher
Question 5: Which of the following is a type of traditional cipher?
transportation cipher
transposition cipher
transforming cipher
translating cipher
Question 7: Which cipher is represented by the following function?
void Cipher(string msg, string key) { // Get key matrix from the key string int keyMat[3][3]; getKeyMatrix(key, keyMat); int msgVector[3][1]; for (int i = 0; i <=2; i++) msgVector[i][0] = (msg[i]) % 65; int cipherMat[3][1]; // Following function generates // the encrypted vector encrypt(cipherMat, keyMat, msgVector); string CipherText; for (int i = 0; i <=2; i++) CipherText += cipherMat[i][0] + 65; cout << CipherText; }
vigenere cipher
hill cipher
keyword cipher
rotor cipher
Question 8: Which cipher is represented by the following function?
public class Cipher { public static String encrypt(String text, final String key) { String res = ""; text = text.toUpperCase(); for (int i = 0, j = 0; i < text.length(); i++) { char c = text.charAt(i); if (c < 'A' || c > 'Z') continue; res += (char) ((c + key.charAt(j) - 2 * 'A') % 26 + 'A'); j = ++j % key.length(); } return res; }
vigenere cipher
hill cipher
keyword cipher
rotor cipher
Question 9: In which of the following cipher the plain text and the ciphered text does not have same number of letters?
affine cipher
hill cipher
columnar cipher
additive cipher
Question 10: What is the meaning of cipher in cryptography?
an algorithm that performs encryption
an algorithm that generates a secret code
an algorithm that performs encryption or decryption
a secret code
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