250+ TOP MCQs on Beaufort Cipher and Answers

Data Structures & Algorithms Multiple Choice Questions on “Beaufort Cipher”.

1. Beaufort cipher is an example of ____________
a) mono-alphabetic cipher
b) poly-alphabetic cipher
c) transposition cipher
d) additive cipher

Answer: b
Clarification: Beaufort cipher is a substitution cipher. It falls under the category of poly alphabetic cipher as it uses multiple substitutions at different positions in order to cipher the plain text.

2. Encryption in beaufort cipher is done using ____________
a) trithemius table
b) vigenere cycle
c) tabula recta
d) four square table

Answer: c
Clarification: Encryption of plain text in beaufort cipher is done by making use of tabula recta. The same table is also used for encryption in vigenere cipher and running key cipher.

3. Which of the following is reciprocal cipher?
a) vigenere cipher
b) autokey cipher
c) running key cipher
d) beaufort cipher

Answer: d
Clarification: A reciprocal cipher is a cipher in which if we try to encrypt the cipher text (using the same cipher) then we gets the plain text as a result. In other words, the process of decryption and encryption is exactly the same.

4. Which of the following is a difference between beaufort cipher and vigenere cipher?
a) they use different tables for encryption
b) vigenere cipher is poly alphabetic whereas beaufort cipher is mono alphabetic
c) vigenere cipher uses a key whereas no key is required for using beaufort cipher
d) they use the same table for encryption, but in a different manner
Answer: d
Clarification: Beaufort cipher is a variation of vigenere cipher. They use the same table i.e. tabula recta for encryption but the table is used in a different manner.

5. Beaufort cipher is a variant of ____________
a) autokey cipher
b) vigenere cipher
c) hill cipher
d) route cipher
Answer: b
Clarification: Beaufort cipher is a variant of vigenere cipher. The difference is that beaufort cipher uses tabula recta in a different manner for encryption.

6. The process of decryption is exactly same as that of encryption in beaufort cipher.
a) True
b) False

Answer: a
Clarification: Beaufort cipher is an example of reciprocal cipher. So that is why the process of decryption is exactly same as that of encryption in beaufort cipher.

7. What will be the plain text corresponding to cipher text “SEDGKG” if beaufort cipher is used with key as “KEY”?
a) PRISON
b) DEATHS
c) SAVEUS
d) ABUSED
Answer: c
Clarification: The process of decryption and encryption are exactly the same in beaufort cipher. So the corresponding plain text would be “SAVEUS”.

8. Beaufort cipher and variant beaufort cipher are same ciphers.
a) True
b) False

Answer: b
Clarification: Beaufort cipher is different from variant beaufort cipher. Variant beaufort cipher is a variant of beaufort cipher.

9. What will be the ciphered text corresponding to “” if beaufort cipher is used for encryption with key as “KEY”?
a) SBPISZTKZH
b) TCQJTAULAI
c) SELFQEXBHM
d) SPBISZKTZH

Answer: c
Clarification: For encrypting plain text choose the first letter of plain text (i.e. S) in the first horizontal row. Then find the first letter of key (i.e. K) in the column obtained in the first step. Finally, choose the leftmost letter of the row (i.e. S) obtained in the previous step. So the corresponding cipher text is “SELFQEXBHM”.

10. What will be the ciphered text corresponding to “ALGORITHM” if beaufort cipher is used for encryption with key as “KEY”?
a) BNJSWOAPV
b) KTSWNQRXM
c) AMIRVNZOU
d) MBPHJSNIU

Answer: b
Clarification: For encrypting plain text choose the first letter of plain text (i.e. A) in the first horizontal row. Then find the first letter of key (i.e. K) in the column obtained in the first step. Finally, choose the leftmost letter of the row (i.e. K) obtained in the previous step. So the corresponding cipher text is “KTSWNQRXM”.

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