1
Q
What are the rules for one-time pads? <4>
A
• The key is at least as long as the plaintext
• The key is truly random
• Each key is used only once
• There should only be two copies of the key:
one for the sender and one for the receiver
2
Q
Define Asymmetric encryption
A
Public Key encryption
• Uses a different key for encryption and
decryption
• Depends on really hard maths problems..
• Need to generate key pairs
– Then choose one as private, the other as public
3
Q
Name 3 types of one-way functions
A
Modular Arithmetic
Prime Factorisation
Factorising Large Numbers
