1. Design and explain a protocol where it is guaranteed that message from Alice is received and confirmed by Bob.

Here are the difficulties:

1. The letter from Alice may be lost on the way.
2. The letter from Alice may catch rain, and Bob cannot understand the blurred message.
3. Assume that the letter from Bob will not lose or catch rain since Bob sends the letter as a Secured letter, but Alice cannot have such option.

2. Then based on your design, answer the following:

1. How does Alice know that Bob received the correct message?
2. If the letter from Alice is lost, what should Alice do?
3. If the message from Alice is blurred, what should Alice do?
4. In your protocol, how does Alice know that the letter is lost?
5. In your protocol, how does Alice know that the message is blurred?

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