The Advanced Encryption Standard (AES) symmetric cipher uses how many rounds of substitution and re-arranging when utilizing a 256-bit key size?

Question

Group of answer choices

9 rounds

13 rounds

18 rounds

24 rounds

Answer 1

The Advanced Encryption Standard (AES) with a 256-bit key size uses 14 rounds of substitution and rearranging. However, based on the multiple-choice options provided, it seems none of those is correct.

To clarify, the number of rounds for different AES key sizes is as follows:

• AES-128: 10 rounds
• AES-192: 12 rounds
• AES-256: 14 rounds

So, if your choices are strictly limited to those, none of them would be the correct answer.