The encryption round has the structure:
A)ShiftRows,MixColumns,SubBytes,InvMixColumns
B)SubBytes,ShiftRows,MixColumns,AddRoundKey
C)MixColumns,ShiftRows,SubBytes,AddRoundKey
D)InvShiftRows,InvSubBytes,AddRoundKey,InvMixColumns

Question

Quizplus · Accepted Answer

The correct order for the encryption round is SubBytes, ShiftRows, MixColumns, and AddRoundKey. This is because SubBytes substitutes each byte with a corresponding value from a substitution table, resulting in confusion. ShiftRows shifts each row in the state matrix to the left, providing diffusion. MixColumns multiplies each column by a fixed polynomial matrix, providing further diffusion. Finally, AddRoundKey XORs the key with the state matrix to add a layer of encryption. This order provides a strong level of encryption and is the standard for AES encryption.

The Encryption Round Has the Structure