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4.Alice designs a new scheme: give a message M, she first uses AES to encrypt M and get the ciphertext C, then uses SHA-256 to
4.Alice designs a new scheme: give a message M, she first uses AES to encrypt M and get the ciphertext C, then uses SHA-256 to hash C and obtain the hash H. Finally, she sends out C | H. Can Alices design ensure (i) confidentiality and (ii) integrity? If not, how to improve?
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