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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