Discussion
AES is a round cipher based on the Rijndal Algorithm that uses a 128-bit block of data. AES has three different configurations. ______ rounds with a key size of 128 bits, ______ rounds with a key size of 192 bits and ______ rounds with a key size of 256 bits.
Answer: B
AES, based on the Rijndael algorithm, has 10 rounds with a 128-bit key, 12 rounds with a 192-bit key and 14 rounds with a 256-bit key, for a 128-bit block of data. The larger key needs more rounds to give the extra strength.
The other sets, such as 5, 7, 15 or 5, 6, 7 or 20, 12, 14, do not give the true number of rounds, and the 128 bit key does not need 20 rounds. Only 10, 12, 14 is correct.
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