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The Inverse S-box value for byte stored in cell (6,3)

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The Inverse S-box value for byte stored in cell (6,3)

(a) 0x00

(b) 0x11

(c) 0x01

(d) 0x04

I have been asked this question in an interview.

The origin of the question is The AES Algorithm topic in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

1 Answer

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Best answer
Correct option is (a) 0x00

Explanation: We first find the multiplicative inverse of 0x63. And then perform the matrix transformation to get 0x00.

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