Cryptography Teacher Question:

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Cryptanalysis is used:
A. to find some insecurity in a cryptographic scheme B. to increase the speed C. to encrypt the data D. none of the mentioned

Cryptography Teacher Interview Question
Cryptography Teacher Interview Question

Answer:

A. to find some insecurity in a cryptographic scheme

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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		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.