Data: Unit 15 : Encryption

Question 1

What is encryption?

Answer 1

the process of encoding a message so it can be read only by the sender and the intended recipient.

Question 2

What are the two types of encryption?

Answer 2

• symmetric encryption.
• asymmetric encryption.

Question 3

What is symmetric encryption?

Answer 3

Encryption is where a single key is used to both encrypt and decrypt a message. both parties need to know the key and keep it a secret.

Question 4

What is asymmetric encryption?

Answer 4

encryption which uses two different keys to encrypt the message and decrypt the message. We start with an unencrypted message and encrypt it with key A, once the message is sent the recipient then decrypts the message with key B.

Question 5

What is the URL when symmetric encryption is used?

Answer 5

HTTPS :- hypertext transfer protocol secure

Question 6

What are the two keys used in Asymmetric encryption?(key pair)

Answer 6

• public key.
• private key.

Question 7

What is the process when receiving a message?

Answer 7

• the sender uses your public key to encrypt the message to send you a message.
  -then when you receive the message you decrypt the message using your private key.

Question 8

What is the process when sending a message using combined encryption?

Answer 8

• you first encrypt your message using your private key and then their public key.
• when the message is sent the recipient decrypts the message using their private key and then their public key.

Question 9

what is the limitation of symmetric encryption?

Answer 9

• shared private keys have a risk of getting intercepted making this method less secure.

Question 10

• What are the other 4 ways of encryption?

Answer 10

• the pigpen cipher.
• the Caesar cipher.
• the Vigenère cipher.
• the rail fence cipher

Question 11

What is plaintext?

Answer 11

• the text that is to be encrypted.

Question 12

What is keystream?

Answer 12

• the characters that are combined with the plaintext to produce an encrypted message.

Question 13

What is keyword?

Answer 13

• the text that is chosen to generate the keystream.