The AES Algorthm MCQ

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• Which function can be used in AES multiplication
  ক

  m(x)=x7+x4+x3

  খ

  m(x)=x8+x4+x3+x+1

  গ

  m(x)=x8+x3+x2+x+1

  ঘ

  m(x)=x8+x5+x3+x
• How many round keys are generated in the AES algorithm?
  ক

  11

  খ

  10

  গ

  8

  ঘ

  12
• The inverse transformation matrix times the forward transformation matrix equals the identity matrix.
  ক

  True

  খ

  False
• On performing the mix column transformation on the matrix (Verify for the first column only)
  ক

  True

  খ

  False
• The output of the previous question on passing through the “mix columns” step function gives us the output
  ক

  3252

  খ

  3743

  গ

  3425

  ঘ

  3473
• The output of the previous question on passing through the “shift row” step function gives us the output
  ক

  C046

  খ

  0C64

  গ

  64C0

  ঘ

  640C
• The output of the previous question, on passing through “nibble substitution” gets us the output
  ক

  3267

  খ

  1344

  গ

  64C0

  ঘ

  CA37
• For a key 25D5 and PT input A479 what is the output we obtain after the “add round key” function?
  ক

  F34D

  খ

  81AC

  গ

  79DF

  ঘ

  327D
• How many step function do Round 1 and 2 each have in S-AES?
  ক

  4 and 3

  খ

  Both 4

  গ

  1 and 4

  ঘ

  3 and 4
• Which of the following is a faulty S-AES step function?
  ক

  Add round key

  খ

  Byte substitution

  গ

  Shift rows

  ঘ

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

  True

  খ

  False
• What is the key size in the S-AES algorithm?
  ক

  16 bits

  খ

  32 bits

  গ

  24 bits

  ঘ

  None of the mentioned
• What is the block size in the Simplified AES algorithm?
  ক

  8 bits

  খ

  40 bits

  গ

  16 bits

  ঘ

  36 bits
• 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
  ক

  0110 1001 0111 0001

  খ

  0110 1111 0110 1011

  গ

  0010 1001 0110 1011

  ঘ

  1111 0101 0111 1111
• On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function?
  ক

  f function

  খ

  permutation p

  গ

  swapping of halves

  ঘ

  xor of subkey with function f
• How many computation rounds does the simplified AES consists of?
  ক

  5

  খ

  2

  গ

  8

  ঘ

  10