Question

On perform the Mix Columns transformation for the sequence of bytes “67 89 AB CD” we get output

(a) {08 55 FF 18}

(b) {28 45 EF 08}

(c) {28 45 FF 18}

(d) {25 35 EF 08}

I have been asked this question during an online interview.

My question is taken from The AES Algorthm in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

Answer 1

The correct choice is (b) {28 45 EF 08}

To explain I would say: Perform the mix columns transformation to obtain the output {28 45 EF 0A}.