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How many modes of operation are there in in DES and AES?

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How many modes of operation are there in in DES and AES?

(a) 4

(b) 3

(c) 2

(d) 5

I got this question by my school teacher while I was bunking the class.

Question is from DES Modes of Operation topic in portion Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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The correct answer is (d) 5

To explain: DES has 5 modes of operation.

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