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The last two blocks of the XTS-AES mode are

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The last two blocks of the XTS-AES mode are

(a) padded as 10*

(b) encrypted/ decrypted using ciphertext-stealing

(c) padded as 10*1

(d) padded and then swapped after encryption/ decryption

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Question is taken from Overview in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

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The correct choice is (b) encrypted/ decrypted using ciphertext-stealing

Easiest explanation: The correct term used to encrypt/ decrypt the last 2 blocks is ‘cipher-text stealing’ where C(m) and C(m-1) are interchanged with each other.

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