Question: 1.In padding oracle attack, if 4 bytes are appended to the message to get length L=9. Give me examples of one valid encoded message and

1.In padding oracle attack, if 4 bytes are appended to the message to get length L=9. Give me examples of one valid encoded message and two invalid encoded messages. Then, explain the byte number on the valid encoded messages that attackers need to modify in order to get error from receiver.

2.Draw a figure of CBC-MAC, then explain why CBC-MAC is deterministic?

3.Show the recommended choice for authenticated encryption

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