Encryption

Question 1

Define encryption

Answer 1

Encoding a message so that only the sender and recipient can read it

Question 2

Types of encryption

Answer 2

Symmetric encryption
Asymmetric encryption

Question 3

Symmetric encryption

Answer 3

Encrypting data using a single key for both the sender and receiver

Question 4

Aysymmetric encryption

Answer 4

A form of encryption using a public and private key

Question 5

Public key

Answer 5

Encrypts the message (converts the message to cypher-text)

Question 6

Private key

Answer 6

Decrypts the message (converts the cypher-text back into the message)

Question 7

How does asymmetric encryption work

Answer 7

• Sender encrypts the message using the public key
• Receiver decrypts the message using the private key
• The public key can not be used to decrypt a message
• Both people must keep their private key to themselves

For 2 way communication both people must have their own private key and the other persons public key

Question 8

Requirements for 2 way communication with asymmetric communication

Answer 8

Both people must have their own private key and the other persons public key

Question 9

Faults with symmetric encryption

Answer 9

• key is vulnerable to interception when being sent from sender to receiver
• If 3rd party gets key , they can read all communication in both directions
• Mathematical analysis can be used to decipher the code (looking at common letters)

Question 10

Faults with aysymetric encryption

Answer 10

Tends to be prodcessor heavy
Is generally used to send a symmetric encryption key , after this symmetric encryption is used