Question

12. Which of the 4 operations are false for each round in the AES algorithm i) Substitute Bytes ii) Shift Columns iii) Mix Rows iv) XOR Round Key
(A) i) only
(B) ii) iii) and iv)
(C) ii) and iii)
(D) only iv)

Answer 1

Answer: b

Explanation: AES rounds involve substitute bytes, shift rows, mix columns and addition of round key.

Answer 2

Answer:

(B) ii) iii) and iv)

Explanation:

Review the broad structure of AES, with an emphasis on the four processes that are employed in each round:

1. Substitution Bytes,
2. Shift rows,
3. Mix columns,
4. Add round key

• Implementations of the lookup tables for the byte substitution steps in encryption and decryption in Python and Perl.

• Substitute bytes, shift rows, mix columns, and the inclusion of a round key are all used in AES rounds.

• As a result, the AES algorithm's Shift rows and Mi columns, as well as the add round key, are false for each round.