Data Structures Algorithms-II MCQs

Page No. 129

Which of the following cipher uses polybius square cipher in its first step of encrypting data?


aAutokey cipher


b One time pad cipher


cADFGVX cipher


dRail fence cipher


View Answer ADFGVX cipher

Polybius square cipher is less susceptible to frequency analysis.


a true


bfalse


cA & B


d None of the above


View Answer false

Auto key cipher is more secure than polybius square cipher?


atrue


bfalse


cA & B


d None of the above


View Answer true

Which two English letters are usually combined in polybius table?


aA and B


bY and Z


cI and J


d J and K


View Answer I and J

Polybius square cipher is most closely related to?


amono-alphabetic cipher


bpoly-alphabetic cipher


ctransposition cipher


dadditive cipher



What is the usual size of polybius square used for encrypting English alphabets?


a5 X 5


b6 X 6


c26 X 26


d25 X 25


View Answer 5 X 5

Which of the following is made possible by the use of Polybius square?


aTo represent the plain text by smaller set of symbols


bTo represent the plain text by larger set of symbols


c To represent the plain text by the letters of some other language


d To represent the plain text by the same set of symbols



How many keys are required for encryption and decryption of data when we use asymmetric cipher?


a0


b1


c2


d3


View Answer 2

Polybius square is also known by the name of?


aPolybius checkboard


bPolybius table


cPloybius board


d Ploybius keypad


View Answer Polybius checkboard

What will be the plain text corresponding to cipher text “IWRWHS” if running key cipher is used with keyword as “SANFOUNDRY”?


aSECRET


bQWERTY


cINDIAN


dFRIEND


View Answer QWERTY

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