Fall 2001, CSE 597E: Quiz 5 - 14 Nov 2001
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- [2 points]
The BAN Logic is (only one answer, please)
- An intuitionistic logic
- A linear logic
- A belief system
- A knowledge system
- [4 point] Which of the following are typical statements in BAN logic (mark all correct answers)
- P believes that X is fresh
- P transmits the information X at time t
- P believes that Q believes X
- P cannot be trusted
- [2 points] Which of the following is a characteristic of the BAN logic
(only one answer, please)
- There is always an adversary
- There are always exactly two parties involved
- There is always a trusted third party which believes in the truth of all messages sent
- All the principals are honest, in the sense that they believe in the truth of the messages they send
- [2 points] What did the BAN logic help discovering in the case of the Needham-Schroeder protocol
(only one answer, please)
- An implicit extra assumption (B assumes that the key he receives from A is fresh)
- An attack strategy (the attacker duplicates the message from A to B)
- The necessity of using a nonce
- The necessity of using a time stamp