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4. Consider the AES encryption with 256 bit key. PLAINTEXT AES KEY #128 .256 128 # 128 128 Round 1 # 128 128 Round 2

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4. Consider the AES encryption with 256 bit key. PLAINTEXT AES KEY #128 .256 128 # 128 128 Round 1 # 128 128 Round 2 Key Expansion Algorithm #128 #128 128 Round N, 128 CIPHERTEXT a) What is the size of the encrypted data block? b) What are the sizes of AES round subkeys? c) What is the number of the rounds N,? d) What is the size of the AES expanded key

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