1. For the protocol in Section 17.3, how might an attacker be able to learn ICA after it times out? What bad things would the attacker be able to do with that knowledge? What bad things would the attacker not be able to do with that knowledge?
2. For the protocol in Section 17.3, consider an attacker who intercepts all communications. Can the attacker retroactively read data between Alice and Bob if KA and KB are both later exposed?