Data Structures Algorithms-II MCQs

Page No. 123

Autokey cipher is an example of ___________


amono-alphabetic cipher

✖


bpoly-alphabetic cipher

✓


ctransposition cipher

✖


dadditive cipher

✖



What is the rule for encryption in playfair cipher if the letters in a pair does not appear in same row or column?


athey are replaced by the letter appearing immediately below them respectively

✖


bthey are replaced by the letter appearing immediately right to them respectively

✖


cthey are replaced by the letter of the same row at the corner of the rectangle defined by the original pair respectively

✓


dthat pair is neglected

✖



What is the rule for encryption in playfair cipher if the letters in a pair appear in same column?


athey are replaced by the letter appearing immediately below them respectively

✓


bthey are replaced by the letter appearing immediately right to them respectively

✖


cthey are replaced by the letters at the corner of the row

✖


dthat pair is neglected

✖



What will be the ciphered text if the string “SANFOUNDRY” is given as input to the code of playfair cipher with keyword as “SECRET” (assuming j is combined with i)?


aZHQAPNPAFR

✖


bAHQAPNPAFR

✓


cHAQAPNPAFR

✖


dQHAAPNPAFR

✖


View Answer AHQAPNPAFR

What is the rule for encryption in playfair cipher if the letters in a pair appear in same row?


athey are replaced by the letter appearing immediately below them respectively

✖


b they are replaced by the letter appearing immediately right to them respectively

✓


cthey are replaced by the letter at the corner of the row

✖


dthat pair is neglected

✖



What is the rule for encryption in playfair cipher if the letters in a pair are identical?


athen that pair is neglected

✖


ba null is added in between the letters

✓


cone of the identical letter is replaced by some other letter

✖


dthen both of the letters are replaced by the letter appearing just next in the row

✖



What will be the plain text corresponding to cipher text “BPKYFS” if playfair cipher is used with keyword as “SECRET” (assuming j is combined with i)?


a INDIAN

✖


bWORLD

✖


cDOLLAR

✓


dHELLO

✖


View Answer DOLLAR

Playfair cipher is harder to crack than keyword cipher.


aTrue

✓


bFalse

✖


cA & B

✖


d None of the above

✖


View Answer True

Which of the following was the first diagram substitution cipher?


aautokey cipher

✖


bhill cipher

✖


cone time pad cipher

✖


dplayfair cipher

✓


View Answer playfair cipher

Which of the following correctly defines poly graphic substitution cipher?


aa substitution based cipher which uses multiple substitutions at different positions

✖


ba substitution based cipher which uses fixed substitution over entire plain text

✖


ca substitution based cipher in which substitution is performed over a block of letters

✓


da transposition based cipher which uses fixed substitution over entire plain text

✖



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