Encryption

Question 1

What is Encryption?

Answer 1

The process of converting plain/original text to cipher text

Question 2

What is Encoding?

Answer 2

Plain text —> Cipher text

Question 3

What is Decoding?

Answer 3

Cipher text —> Plain text

Question 4

List methods of Encryption

Answer 4

Caesar Cipher
Vigenere Cipher
Rail fence Cipher

Question 5

Caesar Cipher EXAMPLE: HELLO, +3

Answer 5

Move each letter to the right by 3 to become ‘KHOOR’

Question 6

Why is Caesar Cipher a weak encryption method?

Answer 6

Because you use the same method to encode and decode

Question 7

Vigenere Cipher EXAMPLE: Encrypt the message FORTNITE using the vigenere cipher and key word BYE.

Answer 7

F O R T N I T E
B Y E B Y E B Y
1 24 4 1 24 4 1
new word: GMVULMUC

Question 8

Why is Vigenere more secure than Caesar cipher?

Answer 8

It’s more difficult to solve

Question 9

Why is a Key stream used for a Vigenere cipher?

Answer 9

To produce an encrypted message

Question 10

Rail fence cipher EXAMPLE: ROCKY ROAD - depth 2

Answer 10

1 - R C Y O D
2 - O K R A
Encrypted —> RCYOD OKRA