Which of these is not a feature of the AES encryption cipher?

Question $41$ Answer

a$.$

Its fast execution time.

b$.$

Its use of Feistal networks.

c$.$

Its ease of use in common programming languages.

d$.$

Its use of a block cipher.

e$.$

Its lack of known vulnerabilities.

Question $42$

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Question text

Which of the following is a vulnerability of the DES encryption cipher?

Question $42$ Answer

a$.$

Encryption and decryption can be done with a single key.

b$.$

Its use of RSA encryption.

c$.$

Long$-$duration encrypted sessions.

d$.$

Its ease of implementation programatically.

e$.$

Its use of a Feistal Block Cipher.