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Theory

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Posttest

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Experiment 6: AES Ciphertext Decryption

Choose difficulty:

Beginner

Intermediate

Advanced

What is the purpose of key expansion in the AES decryption process?

a: To add an additional layer of security Explanation

Explanation

b: To generate a set of round keys for subsequent decryption rounds Explanation

Explanation

c: To increase the size of the original encryption key Explanation

Explanation

d: To mix the columns of the state Explanation

Explanation

In the initial round of AES decryption, what is added to the ciphertext?

a: The first round key Explanation

Explanation

b: The last round key Explanation

Explanation

c: The expanded key Explanation

Explanation

d: The MixColumns operation result Explanation

Explanation

What is the purpose of the Inverse MixColumns operation in the AES decryption process?

a: To mix the columns of the state using a fixed matrix Explanation

Explanation

b: To shift the rows of the state to the right Explanation

Explanation

c: To replace each byte of the state with its inverse in the S-box Explanation

Explanation

d: To XOR the round key with the state Explanation

Explanation

How many decryption rounds does AES-128 use?

a: 8 Explanation

Explanation

b: 10 Explanation

Explanation

c: 12 Explanation

Explanation

d: 14 Explanation

Explanation

In AES decryption, round keys are applied:

a: In the same order as encryption Explanation

Explanation

b: In reverse order of encryption Explanation

Explanation

c: Randomly Explanation

Explanation

d: Without using XOR Explanation

Explanation

Which operation is not used in the final round of AES decryption?

a: Inverse SubBytes Explanation

Explanation

b: Inverse ShiftRows Explanation

Explanation

c: Inverse MixColumns Explanation

Explanation

d: AddRoundKey Explanation

Explanation

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