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The output of the previous question on passing through the “shift row” step function gives us the output

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The output of the previous question on passing through the “shift row” step function gives us the output

(a) C046

(b) 0C64

(c) 64C0

(d) 640C

This question was posed to me at a job interview.

This intriguing question comes from The AES Algorthm topic in section Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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The correct option is (b) 0C64

Easy explanation: 64C0 after passing through the “shift row” round produces an output 640C. A one nibble shift is performed in the second row in this step.

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