Data Compression and Encryption Concepts

The video tutorial covers utility system software, focusing on encryption, defragmentation, and compression utilities. Encryption utilities transform plain text into cipher text using algorithms, with varying complexity. Defragmentation utilities reorganize files on hard disks to improve access speed, though unnecessary for solid-state drives. Compression utilities reduce file size for efficient storage and transmission, with some methods retaining original data while others lose quality.

What is the primary purpose of encryption utilities in operating systems?

• To convert cipher text into plain text

• To scramble plain text into cipher text

• To organize files on a hard disk

• To reduce file size for faster downloads

Which of the following is a characteristic of a Caesar cipher?

• It requires a large amount of computational power

• It is a simple encryption technique

• It is a highly complex encryption technique

• It is used for defragmentation

What is the main function of defragmentation utilities?

• To encrypt data

• To increase the lifespan of solid-state drives

• To compress files

• To reorganize files on a hard disk

Why should solid-state drives not be defragmented?

• They have moving parts

• It reduces their lifespan

• Defragmentation speeds up their access time

• They require frequent defragmentation

What happens to files during the defragmentation process?

• They are deleted

• They are reorganized into a single continuous file

• They are compressed

• They are encrypted

What is the purpose of compression utilities?

• To reduce file size for less disk space usage

• To increase file size

• To encrypt files

• To defragment files

Which type of compression retains the original data in a new format?

• Defragmentation

• Lossless compression

• Encryption

• Lossy compression

What is a key benefit of compressing a video for streaming?

• It encrypts the video

• It allows real-time streaming

• It increases the video quality

• It defragments the video

In the simple compression example, what is stored instead of every single bit?

• The entire data set

• The number of 1s and 0s

• The original file

• The encrypted text

What is the result of using the simple compression technique illustrated?

• Increased data storage

• Defragmented files

• Halved data storage

• Encrypted data