Since there are 256 possible DES keys the chance of picking a weak or semi-weak key at random is 2-52. As long as the user-provided key is chosen entirely at random, they can be safely ignored when DES is used for encryption. Despite this, some users prefer to test whether a key to be used for DES encryption is in fact a weak key. Such a test will have no significant impact on the time required for encryption.
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.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?
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