Quiz UNIT 1 DFS40143

Which of the following best describes encryption?

• Changing data into images

• Encoding data to prevent unauthorized access

• Deleting sensitive information

• Compressing data for storage

Decryption is the process of:

• Breaking a password

• Translating ciphertext into plaintext

• Encrypting plaintext again

• Hiding files in folders

What is plaintext in encryption?

• Unreadable scrambled data

• A file format for text

• Original readable message before encryption

• A special key used for encoding

The purpose of encryption is to:

• Increase file size

• Speed up internet browsing

• Protect data from unauthorized access

• Save data on the cloud

Which of the following is NOT a use case for encryption?

• Online banking

• Social media updates

• Secure emails

• File transfer over networks

DES is what type of encryption algorithm?

• Asymmetric

• Symmetric

• Hashing

• One-time pad

What is the block size used in DES encryption?

• 64-bit

• 128-bit

• 32-bit

• 256-bit

How many rounds are used in DES?

• 8

• 10

• 12

• 16

In DES, the 64-bit key actually uses only how many bits for encryption?

• 64

• 56

• 48

• 32

Which of the following is a weakness of DES?

• Too complex to use

• Uses asymmetric keys

• Short key length

• High processing power needed