H446|U4|T1 Compression, Encryption, and Hashing

Which type of compression permanently removes non-essential data?

• Lossless

• Lossy

• Run Length Encoding

• Dictionary-based

Which compression method is best suited for text files?

• Lossy

• Lossless

• JPG

• MP3

What does RLE stand for?

• Run Length Encoding

• Real Lossless Encryption

• Random Length Extension

• Redundant Lossy Encoding

In RLE, how is repeated data represented?

• By storing each instance of the data

• By removing the repeated data

• By storing one example and the number of repetitions

• By encrypting the repeated data

Dictionary-based compression stores frequently occurring data in a:

• Hash table

• Array

• Dictionary

• Queue

What is the purpose of encryption?

• To reduce file size

• To ensure data integrity

• To make data unreadable without the correct key

• To speed up data transfer

In encryption, the original message is called:

• Ciphertext

• Key

• Plaintext

• Hash

Which of the following is a simple substitution cipher?

• Vernam cipher

• Caesar cipher

• Asymmetric encryption

• Hashing

What is a weakness of the Caesar cipher?

• It is too complex

• It is unbreakable

• It can be easily broken using frequency analysis

• It requires a one-time pad

Which cipher is proven to be unbreakable if used correctly?

• Caesar cipher

• Vernam cipher

• Symmetric encryption

• Hashing