Q. For the AES-128 algorithm there are __________ similar rounds and _________ round is different.

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

x3 + 1 x
x x3 + 1

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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]

View solution

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

View solution