gs gs122 Cryptography - Playfair Cipher - Quiz No.1
gs gs122 Data Communication and Computer Network Quiz
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Question 1: What is the alternative name of playfair cipher?
Wadsworth’s cipher
Wheatstone playfair cipher
Playfair rectangle
Wheatstone cipher
Question 2: Playfair cipher is an example of __________
mono-alphabetic cipher
poly-alphabetic cipher
transposition cipher
additive cipher
Question 3: Encryption in Autokey cipher is done using __________
a 5×5 table
a 13×2 table
vigenere table
a 6×6 table
Question 4: Which of the following correctly defines poly graphic substitution cipher?
a substitution based cipher which uses multiple substitutions at different positions
a substitution based cipher which uses fixed substitution over entire plain text
a substitution based cipher in which substitution is performed over a block of letters
a transposition based cipher which uses fixed substitution over entire plain text
Question 5: Which of the following was the first diagram substitution cipher?
autokey cipher
hill cipher
one time pad cipher
playfair cipher
Question 6: Which of the following is hardest to break using frequency analysis?
Vigenere cipher
Autokey cipher
Playfair cipher
Rotor cipher
Question 9: What is the rule for encryption in playfair cipher if the letters in a pair are identical?
then that pair is neglected
a null is added in between the letters
one of the identical letter is replaced by some other letter
then both of the letters are replaced by the letter appearing just next in the row
Question 10: What is the rule for encryption in playfair cipher if the letters in a pair appear in same row?
they are replaced by the letter appearing immediately below them respectively
they are replaced by the letter appearing immediately right to them respectively
they are replaced by the letter at the corner of the row
that pair is neglected
Question 12: What is the rule for encryption in playfair cipher if the letters in a pair appear in same column?
they are replaced by the letter appearing immediately below them respectively
they are replaced by the letter appearing immediately right to them respectively
they are replaced by the letters at the corner of the row
that pair is neglected
Question 13: What is the rule for encryption in playfair cipher if the letters in a pair does not appear in same row or column?
they are replaced by the letter appearing immediately below them respectively
they are replaced by the letter appearing immediately right to them respectively
they are replaced by the letter of the same row at the corner of the rectangle defined by the original pair respectively
that pair is neglected
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