Data Structures Algorithms-II MCQs

Page No. 137

What is the formula used for decoding the ciphered text using affine cipher(a,b are constants and x is the numerical equivalent of a letter to be encrypted)?


aa-1(x-b)%26


b(ax+b)%26


cb-1(x-a)%26


db-1(x-a)


View Answer a-1(x-b)%26

What is the formula used for encryption of data using affine cipher(a,b are constants and x is the numerical equivalent of a letter to be encrypted)?


aax+b


b(ax+b)%26


cax2+bx


d(ax2+bx)%26


View Answer (ax+b)%26

Choose the weakest cipher from the following?


aVigenere cipher


bAutokey cipher


cAffine cipher


dHill cipher


View Answer Affine cipher

Which of the following cipher requires only one key for decoding the ciphered text?


aAffine cipher


bRSA


cDSA


dPKCS


View Answer Affine cipher

Which of the following cipher makes use of linear algebra for encrypting data?


apolybius square cipher


baffine cipher


ccaesar cipher


drail fence cipher


View Answer affine cipher

What is the rate of the hamming code of parity bit m=8?


a0.94


b0.92


c0.90


d0.97


View Answer 0.97

For a hamming code of parity bit m=8, what is the total bits and data bits?


a (255, 247)


b(127, 119)


c(31, 26)


d(0, 8)


View Answer (255, 247)

What is the code rate of a repetition Hamming code (3, 1)?


a1


b3


c1/3


d1.3


View Answer 1/3

An Extended hamming code is also called as __________


aSEDDEC


bSEDDED


cSECDED


dSECDEC


View Answer SEDDED

________ is the mechanism of sending data bits multiple times to ensure consistency.


aRepetition


bDuplication


cMirroring


dRedundancy


View Answer Repetition

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