FIT1047 week 11

What keys are used in asymmetric encryption?

• Two public
• One public, one private
• Two private

In cybersecurity, what is "integrity"?

• Messages cannot be intercepted by a third party
• Messages cannot be read by a third party
• Messages cannot be altered by a third party

Which of these encryption techniques are symmetric

• AES
• RSA
• ROT-13

Which of these are disadvantages of symmetric encrpytion?

• Integrity cannot be guaranteed
• All sender/receiver pairs need unique secret keys, meaning keys need to be really large
• Since the key is secret, it needs to somehow be securely established first
• Symmetric encryption is usually more computationally difficult than asymmetric encryption

What does a hash function do?

• Encrypts a given input using a key
• Turns an input of any length into an output of a fixed length
• Decrypts a given input using a key

Which of these is an essential feature for making a hash function useful for cryptography?

• The hash function should generate a different output each time, based on random generators
• It should be infeasible to reverse the hash function and get the input back from just the output
• It should be possible to get the input to the hash function back by using the key
• The hash function should take a long time to run

What is MAC (in the context of cryptography)

• Media Access Control
• Message Access Control
• Message Authentication Code
• Message Authentication Crytography

What is the purpose of the MAC?

• Provides better encryption than ordinary AES
• Enforces integrity (allows the recipient to check if the message has been changed)
• Makes the AES algorithm more efficient
• Lets the AES algorithm use shorter keys

What does TLS stand for?

• Transport Layer Security
• Transport Layer Sectors
• True Lossless Security

Does TLS use symmetric or asymmetric encryption once the handshake is established?

• Symmetric
• Asymmetric