Cryptography Teacher Question:

Which of the following is a faulty S-AES step function?
a) Add round key
b) Byte substitution
c) Shift rows
d) Mix Columns

Cryptography Teacher Interview Question
Cryptography Teacher Interview Question

Answer:

b) Byte substitution
Explanation: The correct version in S-AES would be nibble substitution as 4 bits are taken at a time.


Previous QuestionNext Question
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		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