MCQOPTIONS

Explore topic-wise MCQs in Playfair Cipher Multiple Choice.

This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Playfair Cipher Multiple Choice knowledge and support exam preparation. Choose a topic below to get started.

1.	What is the rule for encryption in playfair cipher if the letters in a pair does not appear in same row or column?
A.	they are replaced by the letter appearing immediately below them respectively
B.	they are replaced by the letter appearing immediately right to them respectively
C.	they are replaced by the letter of the same row at the corner of the rectangle defined by the original pair respectively
D.	that pair is neglected
Answer» D. that pair is neglected

2.	What is the rule for encryption in playfair cipher if the letters in a pair appear in same column?
A.	they are replaced by the letter appearing immediately below them respectively
B.	they are replaced by the letter appearing immediately right to them respectively
C.	they are replaced by the letters at the corner of the row
D.	that pair is neglected
Answer» B. they are replaced by the letter appearing immediately right to them respectively

3.	What is the rule for encryption in playfair cipher if the letters in a pair appear in same row?
A.	they are replaced by the letter appearing immediately below them respectively
B.	they are replaced by the letter appearing immediately right to them respectively
C.	they are replaced by the letter at the corner of the row
D.	that pair is neglected
Answer» C. they are replaced by the letter at the corner of the row

4.	What is the rule for encryption in playfair cipher if the letters in a pair are identical?
A.	then that pair is neglected
B.	a null is added in between the letters
C.	one of the identical letter is replaced by some other letter
D.	then both of the letters are replaced by the letter appearing just next in the row
Answer» C. one of the identical letter is replaced by some other letter

5.	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
B.	WORLD
C.	DOLLAR
D.	HELLO
Answer» D. HELLO

6.	Playfair cipher is harder to crack than keyword cipher.
A.	True
B.	False
Answer» B. False

7.	Which of the following was the first diagram substitution cipher?
A.	autokey cipher
B.	hill cipher
C.	one time pad cipher
D.	playfair cipher
Answer» E.

8.	Which of the following correctly defines poly graphic substitution cipher?
A.	a substitution based cipher which uses multiple substitutions at different positions
B.	a substitution based cipher which uses fixed substitution over entire plain text
C.	a substitution based cipher in which substitution is performed over a block of letters
D.	a transposition based cipher which uses fixed substitution over entire plain text
Answer» D. a transposition based cipher which uses fixed substitution over entire plain text

9.	Encryption in Autokey cipher is done using __________
A.	a 5 5 table
B.	a 13 2 table
C.	vigenere table
D.	a 6 6 table
Answer» D. a 6 6 table

10.	Playfair cipher is an example of __________
A.	mono-alphabetic cipher
B.	poly-alphabetic cipher
C.	transposition cipher
D.	additive cipher
Answer» C. transposition cipher

11.	What is the alternative name of playfair cipher?
A.	Wadsworth s cipher
B.	Wheatstone playfair cipher
C.	Playfair rectangle
D.	Wheatstone cipher
Answer» C. Playfair rectangle