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Theory

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Posttest

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Experiment 6: AES Ciphertext Decryption

Choose difficulty:

Beginner

Intermediate

Advanced

How many rounds of the inverse round transformation are performed during AES decryption with a 192-bit key?

a: 8 rounds Explanation

Explanation

b: 10 rounds Explanation

Explanation

c: 12 rounds Explanation

Explanation

d: 14 rounds Explanation

Explanation

What is the purpose of the Final Round in the AES decryption process?

a: To generate the initial round key Explanation

Explanation

b: To perform the Inverse MixColumns operation Explanation

Explanation

c: To apply the Inverse ShiftRows transformation Explanation

Explanation

d: To complete the decryption by adding the final round key Explanation

Explanation

During key expansion, how many rounds are generated for a 256-bit key in the AES decryption process?

a: 8 rounds Explanation

Explanation

b: 10 rounds Explanation

Explanation

c: 12 rounds Explanation

Explanation

d: 14 rounds Explanation

Explanation

What is the purpose of the InvSubBytes step in AES decryption?

a: To rearrange the rows of the state Explanation

Explanation

b: To reverse the column mixing Explanation

Explanation

c: To undo the non-linear substitution applied during encryption Explanation

Explanation

d: To apply the round key into the state Explanation

Explanation

The InvShiftRows operation in AES decryption:

a: Shifts rows to the left Explanation

Explanation

b: Shifts rows to the right Explanation

Explanation

c: Replaces bytes using the S-box Explanation

Explanation

d: Eliminates MixColumns Explanation

Explanation

The decryption S-box (inverse S-box) is used in which step?

a: AddRoundKey Explanation

Explanation

b: InvSubBytes Explanation

Explanation

c: InvMixColumns Explanation

Explanation

d: InvShiftRows Explanation

Explanation

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