Question: 4. (15 points) Answer whether the following statements are true / false. Justify the answer in short. a. AES is a Stream cipher intended to

4. (15 points) Answer whether the following statements are true /

4. (15 points) Answer whether the following statements are true / false. Justify the answer in short. a. AES is a Stream cipher intended to replace DES for commercial applications. b. In the AES the decryption algorithm is not identical to the encryption algorithm. C. Your friend who is new to the world of computer security says, for block ciphers any random strategy for substitution and permutation will not guarantee the cipher to be strong always. Is your friend correct or not? Justify the

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