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Which of the following is true for the tweak in XTS-AES mode?

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Which of the following is true for the tweak in XTS-AES mode?

(a) they are non-negative integers

(b) they are of size 128 bits

(c) they are assigned consecutively

(d) all of the mentioned

I had been asked this question by my school principal while I was bunking the class.

I'd like to ask this question from DES Modes of Operation topic in section Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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Right choice is (d) all of the mentioned

Explanation: All of the statements are true in relation to the tweak ‘i’ from the XTS-AES mode of operation.

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