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Advanced Encryption Algorithm and Block Cipher Operation - DES Modes of Operation - Quiz No.3

gs gs124 Advanced Encryption Algorithm and Block Cipher Operation - DES Modes of Operation - Quiz No.3

gs gs124 Introduction Cyber Security Quiz

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Question 1: What is the size of the XTS-AES key?
1024 bits
64 bits
512 bits
128 bits
Question 2: Which of the following represent the tweak?
j
i
alpha
alphaj
Question 3: Which of the following is true for the tweak in XTS-AES mode?
they are non-negative integers
they are of size 128 bits
they are assigned consecutively
all of the mentioned
Question 4: Which of the following is the correct encryption statement representation for the XTS-AES mode?
E(K1,P) XOR T
E(K2,T) XOR P
E(K1,T XOR P) XOR P
E(K1,P XOR T) XOR T
Question 5: The last two blocks of the XTS-AES mode are –
padded as 10*
encrypted/ decrypted using ciphertext-stealing
padded as 10*1
padded and then swapped after encryption/ decryption

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