Encryption

Question 1

What is encryption?

Answer 1

This means to scramble data in such a way that only someone with the key can read it.

Question 2

Why is encryption used?

Answer 2

To protect personal information, guard against identity theft, to secure classified information and to protect corporate sensitive information.

Question 3

What is the process of encryption?

Answer 3

A key is used to encrypt plain text into meaningless data

The same key is used to decrypt data back into plain text

Only someone who has the key can decrypt the information

If you don’t have the key you need to crack the code

Question 4

What is the Caesar Cipher?

Answer 4

It is a type of substitution cipher in which each character in the alphabet is shifted by a fixed number of positions down the alphabet.

Question 5

If there was a left shift of 3 what would:

1) D become
2) E become

Answer 5

1) A

2) B

Question 6

What is a symmetric algorithm?

Answer 6

They require one key that is known by the sender and receiver of data. The disadvantage is that both parties know the secret key.

Question 7

What is an asymmetric algorithm?

Answer 7

They require two keys; a public key and a private key. The public key is shared but to protect the data the private key is only stored by the user.