Encryption & Viruses - Computer Fundamentals Questions and Answers

This set of Computer Fundamentals Multiple Choice Questions & Answers (MCQs) focuses on “Encryption and Viruses”.

1. A cipher in which the order is not preserved.
a) Polyalphabetic substitution based
b) Transposition-based
c) Substitution based
d) Public key based
View Answer

Answer: b
Explanation: In transposition-based cipher, the order of the plain text is not preserved. They can be very simple to identify.

2. Plain text is the data after encryption is performed.
a) True
b) False
View Answer

Answer: b
Explanation: The statement is false. Cipher is the algorithm used in encryption. Ciphertext is the data after encryption is performed.

3. A unique piece of information that is used in encryption.
a) Cipher
b) Plain Text
c) Key
d) Cipher
View Answer

Answer: c
Explanation: The key is the unique piece of information. It is used to create the cipher text and decrypt it back.

4. Study of creating and using encryption and decryption techniques.
a) Cipher
b) Cryptography
c) Encryption
d) Decryption
View Answer

Answer: b
Explanation: It is called as cryptography. It is the study of creating and using the encryption techniques.

5. The process of transforming plain text into unreadable text.
a) Decryption
b) Encryption
c) Network Security
d) Information Hiding
View Answer

Answer: b
Explanation: Encryption is the process of transforming readable text i.e. plain text to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key.

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6. An algorithm used in encryption is referred to as cipher.
a) True
b) False
View Answer

Answer: a
Explanation: The statement is true. Cipher is the algorithm used in encryption. Encryption is making readable text as unreadable to keep it secured.

7. A process of making the encrypted text readable again.
a) Decryption
b) Encryption
c) Network Security
d) Information Hiding
View Answer

Answer: a
Explanation: The reverse process is called decryption. It is the process of making the information readable again.

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