# Computer Fundamentals Questions and Answers – Encryption and Viruses

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

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

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

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

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

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.
Note: Join free Sanfoundry classes at Telegram or Youtube

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

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

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

Sanfoundry Global Education & Learning Series – Computer Fundamentals.

To practice all areas of Computer Fundamentals, here is complete set of 1000+ Multiple Choice Questions and Answers.