Question: (a) Why was there a need to replace DES? What is the main reason for the AES-Rijndael algorithm to be more secure than DES? (b)

(a) Why was there a need to replace DES? What is the main reason for the AES-Rijndael algorithm to be more secure than DES?

(b) Describe a mode in which DES can be used securely after all

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