Flashcards in Encryption and Compression Deck (11)

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1

## What is compression?

### The act of making file size smaller

2

## How many types of compression are there?

### 2

3

## Define the two types of compression

###
LOSSLESS

No data is lost in compression and original can be recreated exactly

LOSSY

Data deemed non-essential is deleted. An exact replica can not be recovered

Lossy can be compressed to much smaller than lossless compression

4

## What is Run Length Encoding (RLE)

###
Search for patterns in code that can shortened.

1111122255311111 - 16 bits of data

1, 3 2, 2 5, 1 3, 5 1 - 10 bits of data

5

## Define encryption

### ENCRYPTION is the conversion of data into a form that is difficult to read by an unauthorised third party.

6

## Define decryption

### DECRYPTION is the process of turning scrambled data into data that can be understood.

7

## Define cipher

### CIPHER - The algorithm for encryption

8

## Define key

### KEY - The secret information used to encrypt/decrypt the data

9

## Define plaintext

### PLAINTEXT - The original form of the data CIPHERTEXT - The encrypted data

10

## What is the Vernam cipher

###
Uses Baudot Code and the XOR bitwise operator

Uses a one-time pad key (randomly generated and changes after 1 use)

11