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Please describe the pros and cons of one-time-pad encryption mechanism. Please draw a diagram specifying how CBC encrypt and decrypt data. Please describe the difference

  1. Please describe the pros and cons of one-time-pad encryption mechanism.
  2. Please draw a diagram specifying how CBC encrypt and decrypt data.
  3. Please describe the difference of DES and AES. Which one is more secure? Why?
  4. When sending a message from one party to another, how should we ensure both the confidentiality and integrity of the message. Please provide a solution.
  5. Please demonstrate a forgery attack against CBC MAC.

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