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

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b One time pad cipher

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cADFGVX cipher

✓


dRail fence cipher

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View Answer ADFGVX cipher

Polybius square cipher is less susceptible to frequency analysis.


a true

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bfalse

✓


cA & B

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d None of the above

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View Answer false

Auto key cipher is more secure than polybius square cipher?


atrue

✓


bfalse

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cA & B

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d None of the above

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View Answer true

Which two English letters are usually combined in polybius table?


aA and B

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bY and Z

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cI and J

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d J and K

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View Answer I and J

Polybius square cipher is most closely related to?


amono-alphabetic cipher

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bpoly-alphabetic cipher

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ctransposition cipher

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dadditive cipher

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


a5 X 5

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b6 X 6

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c26 X 26

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d25 X 25

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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

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bTo represent the plain text by larger set of symbols

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

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

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


a0

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b1

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c2

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d3

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View Answer 2

Polybius square is also known by the name of?


aPolybius checkboard

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bPolybius table

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cPloybius board

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d Ploybius keypad

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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

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bQWERTY

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cINDIAN

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dFRIEND

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View Answer QWERTY

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