Cryptography Teacher Question:

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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}

Cryptography Teacher Interview Question
Cryptography Teacher Interview Question

Answer:

a) {62 63 63 63}
Explanation: Applying the key algorithm we get,
w(0) = {00 00 00 00}; w(1) = {00 00 00 00}; w(2) = {00 00 00 00}; w(3) = {00 00 00 00};
w(4) = {62 63 63 63}; w(5) = {62 63 63 63}; w(6) = {62 63 63 63}; w(7) = {62 63 63 63}

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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
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