Question: What are the basic structures and techniques to encrypt data? Can you generalize the 6 4 - bit block size and 5 6 - bit

What are the basic structures and techniques to encrypt data?
Can you generalize the 64-bit block size and 56-bit key DES to DES+ with 128-bit block size and 128-bit key? How about with 196-bit and 252-bit keys?
Why do you think AES is a better encryption algorithm?
Why is using the CBC mode a good way to encrypt a long message?

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