Linear cryptanalysis was first devised by Matsui and Yamagishi in an attack on FEAL. It was extended by Matsui to attack DES. Linear cryptanalysis is a known plaintext attack and uses a linear approximation to describe the behavior of the block cipher. Given sufficient pairs of plaintext and corresponding ciphertext, bits of information about the key can be obtained and increased amounts of data will usually give a higher probability of success.
What is the key size in the S-AES algorithm? a) 16 bits b) 32 bits c) 24 bits d) None of the mentioned
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
What is data encryption standard (DES)? A. block cipher B. stream cipher C. bit cipher D. none of the mentioned
In asymmetric key cryptography, the private key is kept by A. sender B. receiver C. sender and receiver D. all the connected devices to the network
Is the following matrix the inverse matrix of the matrix used in the mix columns step? x3 + 1 x x x3 + 1 a) Yes b) No c) Can’t say d) Insufficient Information
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}Voice privacy in GSM cellular telephone protocol is provided by A. A5/2 cipher B. b5/4 cipher C. b5/6 cipher D. b5/8 cipher
A straight permutation cipher or a straight P-box has same number of inputs as cipher Frames Outputs Bits
In cryptography, what is cipher? A. algorithm for performing encryption and decryption B. encrypted message C. both (a) and (b) D. none of the mentioned
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.
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