Data Structures Algorithms-II MCQs

Page No. 124

Playfair cipher is an example of __________


amono-alphabetic cipher

✖


bpoly-alphabetic cipher

✓


ctransposition cipher

✖


dadditive cipher

✖



What is the alternative name of playfair cipher?


aWadsworth’s cipher

✖


bWheatstone playfair cipher

✓


cPlayfair rectangle

✖


dWheatstone cipher

✖



What will be the ciphered text if the plain text “SAN” is encrypted using hill cipher with keyword as “GYBNQKURP”?


aRAJ

✓


bJAR

✖


cARJ

✖


dAJR

✖


View Answer RAJ

A key matrix used for encryption in hill cipher must be?


ainvertible matrix

✓


bnon invertible matrix

✖


csquare matrix

✖


drectangular matrix

✖


View Answer invertible matrix

What will be the size of a key matrix if the plain text is “SECRET”?


a 1×6

✖


b5×1

✖


c6×1

✖


d 6×6

✓


View Answer 6×6

What will be the plain text corresponding to cipher text “YGQ“ if hill cipher is used with keyword as “GYBNQKURP”?


aSECRET

✓


bWORLD

✖


c DOLLAR

✖


dHELLO

✖


View Answer SECRET

Hill cipher is harder to crack than playfair cipher.


aTrue

✖


bFalse

✓


cA & B

✖


d None of the above

✖


View Answer False

Which of the following is hardest to break using frequency analysis?


aVigenere cipher

✖


bHill cipher

✓


cCaesar cipher

✖


d Affine cipher

✖


View Answer Hill cipher

Which of the following was the first poly graphic cipher to be able to operate on more than 3 letters at once?


aautokey cipher

✖


bhill cipher

✓


cone time pad cipher

✖


d playfair cipher

✖


View Answer hill cipher

What is 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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