Key distribution center

1 What are some threats associated with a direct digital signature scheme?

2 List ways in which secret keys can be distributed to two communicating parties.

3 What is the difference between a session key and a master key?

4 What is a nonce?

5 What is a key distribution center?

1 List two disputes that can arise in the context of message authentication.

2 What are the properties a digital signature should have?

3 What requirements should a digital signature scheme satisfy?

4 What is the difference between direct and arbitrated digital signature?

5 In what order should the signature function and the confidentiality function be applied to a message, and why?