Export of DES, either in hardware or software, is strictly regulated by the U.S. State Department and the NSA. The government rarely approves export of DES, despite the fact that DES is widely available overseas; financial institutions and foreign subsidiaries of U.S. companies are exceptions.
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.On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function? a) f function b) permutation p c) swapping of halves d) xor of subkey with function f
Tell me what can you use to defend against multiple login attempts?
Explain Kerckhoff’s Principle for Cryptosystem?
ElGamal encryption system is A. symmetric key encryption algorithm B. asymmetric key encryption algorithm C. not an encryption algorithm D. none of the mentioned
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