Explore topic-wise MCQs in Symmetric Ciphers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Symmetric Ciphers knowledge and support exam preparation. Choose a topic below to get started.

1.

S-AES and S-DES were both developed by the same person as an educational cryptography system to teach students

A. True
B. False
Answer» B. False
Discussion
2.

For the cipher text 0000 0111 0011 1000 and Key 0110 1111 0110 1011, apply the Simplified AES to obtain the plaintext. The plain text is

A. 0110 1001 0111 0001
B. 0110 1111 0110 1011
C. 0010 1001 0110 1011
D. 1111 0101 0111 1111
Answer» C. 0010 1001 0110 1011
Discussion
3.

6.On perform the Mix Columns transformation for the sequence of bytes 67 89 AB CD we get output

A. {08 55 FF 18}
B. {28 45 EF 08}
C. {28 45 FF 18}
D. {25 35 EF 08}
Answer» C. {28 45 FF 18}
Discussion
4.

On perform the Mix Columns transformation for the sequence of bytes 77 89 AB CD we get output

A. {01 55 EE 4A}
B. {0A 44 EF 4A}
C. {08 55 FF 3A}
D. {09 44 DD 4A}
Answer» D. {09 44 DD 4A}
Discussion
5.

For an inputs key of size 128 bits constituting of all zeros, what is w(7) ?

A. {62 63 63 63}
B. {62 62 62 62}
C. {00 00 00 00}
D. {63 63 63 62}
Answer» B. {62 62 62 62}
Discussion
6.

For the case of Mixed Columns and Inverse Mixed Columns, is it true that b(x) = a-1(x)mod(x4 + 1)where a(x) = {03}x3 + {01}x2 + {01}x + {02} and b(x) = {0B}x3 + {0D}x2 + {09}x + {0E}

A. True
B. False. The expression for a(x) is wrong.
C. False. The expression for b(x) is wrong.
D. False. Both a(x) and b(x) are faulty.
Answer» B. False. The expression for a(x) is wrong.
Discussion