5. Authentication Protocols

Question 1

What solves symmetric key distribution problem?

Answer 1

Public/private keys

Question 2

How to prevent Eve from creating a pair of keys pretending to be Bob?

Answer 2

Public key infrastructure
1. Web of trust
2. Trusted authority

Question 3

What’s the hiding property?

Answer 3

During commit phase, receiver knows nothing about x

Question 4

What’s the binding property?

Answer 4

Sender can’t change x after committing to it.

Question 5

The binding property protects the sender.

Answer 5

False, protects the receiver

Question 6

What can prevent a replay attack?

Answer 6

Nonce