IAS CH5 QUIZ

AES uses a Feistel structure.

• T

• F

At each horizontal point, State is the same for both encryption and

decryption.

• T

• F

DES is a block cipher intended to replace AES for commercial

applications.

• T

• F

The nonlinearity of the S-box is due to the use of the multiplicative

inverse.

• T

• F

Virtually all encryption algorithms, both conventional and publickey,

involve arithmetic operations on integers.

• T

• F

Compared to public-key ciphers such as RSA, the structure of AES

and most symmetric ciphers is quite complex and cannot be

explained as easily as many other cryptographic algorithms.

• T

• F

The ordering of bytes within a matrix is by column.

• T

• F

In the Advanced Encryption Standard the decryption algorithm is

identical to the encryption algorithm.

• T

• F

The S-box is designed to be resistant to known cryptanalytic

attacks.

• T

• F

InvSubBytes is the inverse of ShiftRows.

• T

• F