Engineering Questions with Answers - Multiple Choice Questions
Atbash Cipher Multiple Choice MCQ
1 - Question
Which of the following cipher does not require a key for encrypting plain text?
a) atbash cipher
b) affine cipher
c) playfair cipher
d) vigenere cipher
View Answer
Answer: a
Explanation: Out of the given options only atbash cipher does not require a key for encryption. Atbash cipher is an example of a substitution cipher.
2 - Question
Atbash cipher was originally used for encrypting _____________
a) english alphabet
b) greek alphabet
c) hebrew alphabet
d) hindi alphabet
View Answer
Answer: c
Explanation: Atbash cipher was originally built to encrypt hebrew alphabet. But it can be used to encrypt any type of alphabets.
3 - Question
Which of the following cipher is a special case of affine cipher?
a) Vigenere cipher
b) Autokey cipher
c) Atbash cipher
d) Hill cipher
View Answer
Answer: c
Explanation: Atbash cipher is a special case of affine cipher. We have to assume a=b=25 as the key in affine cipher to get the same encryption.
4 - Question
Choose the weakest cipher from the following?
a) vigenere cipher
b) rail fence cipher
c) hill cipher
d) atbash cipher
View Answer
Answer: d
Explanation: Atbash cipher is the weakest cipher out of the given options. This is because it is a simple mono alphabetic substitution cipher with almost no security. It can be cracked without even knowing which technique has been used for encryption.
5 - Question
Which of the following is a mono alphabetic substitution cipher?
a) vigenere cipher
b) one time pad cipher
c) play fair cipher
d) atbash cipher
View Answer
Answer: d
Explanation: Atbash cipher is the only mono alphabetic substitution cipher out of the given options. All the remaining options fall under the category of poly alphabetic cipher.
6 - Question
Atbash cipher is less secure than affine cipher.
a) True
b) False
View Answer
Answer: a
Explanation: Affine cipher is more secure as compared to pigpen cipher. Atbash cipher is a special case of affine cipher and can be cracked without even knowing which technique has been used for encryption.
7 - Question
Atbash cipher is an example of?
a) Mono alphabetic substitution cipher
b) Transposition cipher
c) Poly alphabetic substitution cipher
d) Geometric substitution cipher
View Answer
Answer: a
Explanation: Atbash cipher is an example of mono alphabetic substitution cipher. It replaces each alphabet of the plain text with a corresponding letter which we can see in the table below.
A - Z J - Q S - H B - Y K - P T - G C - X L - O U - F D - W M - N V - E E - V N - M W - D F - U O - L X - C G - T P - K Y - B H - S Q - J Z - A I - R R - I
8 - Question
Atbash cipher cannot be cracked until the exact type of encryption of ciphered text is known.
a) True
b) False
View Answer
Answer: b
Explanation: Atbash cipher is a very weak cipher. It can be easily broken without even knowing the exact technique which has been used for encryption. We can just assume the ciphered text to be a substitution cipher in order to crack it.
9 - Question
What will be the ciphered text corresponding to plain text “SECRET” if atbash cipher is used for encryption?
a) VHIXVG
b) HVXIVG
c) HXVIVG
d) VIHXIV
View Answer
Answer: b
Explanation: Atbash cipher replaces each alphabet of the plain text with a corresponding letter which we can see in the table below.
A - Z J - Q S - H B - Y K - P T - G C - X L - O U - F D - W M - N V - E E - V N - M W - D F - U O - L X - C G - T P - K Y - B H - S Q - J Z - A I - R R - I
So the ciphered text would be “HVXIVG”.
10 - Question
What will be the plain text corresponding to ciphered text “MAO” if atbash cipher is used for encryption?
a) NZL
b) IND
c) AUS
d) ENG
View Answer
Answer: a
Explanation: Atbash cipher replaces each alphabet of the plain text with a corresponding letter which we can see in the table below.
A - Z J - Q S - H B - Y K - P T - G C - X L - O U - F D - W M - N V - E E - V N - M W - D F - U O - L X - C G - T P - K Y - B H - S Q - J Z - A I - R R - I
So the plain text would be “NZL”.
11 - Question
Which of the following is not true about atbash cipher?
a) it is a mono alphabetic substitution cipher
b) it can only be used to encrypt hebrew alphabet
c) it is a special case of affine cipher
d) it is weaker than playfair cipher
View Answer
Answer: b
Explanation: Atbash cipher was originally built to encrypt hebrew alphabet. But it can be used to encrypt any type of alphabets.