Q. Which of the 4 operations are false for each round in the AES algorithm ?

i) Substitute Bytes
ii) Shift Columns
iii) Mix Rows
iv) XOR Round Key

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Q. There is an addition of round key before the start of the AES round algorithms.

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Q. The multiplicative inverse of 0x95 in AES where m(x)=x^8+x^4+x^3+x+1 is

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Q. How many computation rounds does the simplified AES consists of?

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

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Q. On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function?

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

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Q. n perform the Mix Columns transformation for the sequence of bytes “67 89 AB CD” we get output

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Q. Is the following matrix the inverse matrix of the matrix used in the mix columns step?

x3 + 1 x
x x3 + 1

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Q. 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

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Q. What is the block size in the Simplified AES algorithm?

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Q. What is the key size in the S-AES algorithm?

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

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Q. Which of the following is a faulty S-AES step function?

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Q. How many step function do Round 1 and 2 each have in S-AES?

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

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Q. The inverse transformation matrix times the forward transformation matrix equals the identity matrix.

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Q. Which of the following are true ?

i) In the AES key expansion algorithm, the function g() operates on w i+3
ii) Perform a one-byte right circular rotation on the argument 4-byte word
iii) The round constant follows the formula RC[j] = RC[j − 1]

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Q. How many round keys are generated in the AES algorithm?

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Q. How many modes of operation are there in in DES and AES?

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