Q. Like DES, AES also uses Feistel Structure.

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Q. Which one of the following is not a cryptographic algorithm- JUPITER, Blowfish, RC6, Rijndael and Serpent?

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Q. Which algorithm among- MARS, Blowfish, RC6, Rijndael and Serpent -was chosen as the AES algorithm?

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Q. How many rounds does the AES-192 perform?

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Q. How many rounds does the AES-256 perform?

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Q. What is the expanded key size of AES-192?

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Q. The 4×4 byte matrices in the AES algorithm are called

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Q. In AES the 4×4 bytes matrix key is transformed into a keys of size __________

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

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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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