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

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

(a) 0x3C

(b) 0xB3

(c) 0x4F

(d) 0x90

This question was posed to me in an interview for internship.

Enquiry is from The AES Algorithm in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

1 Answer

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Best answer
Right choice is (b) 0xB3

To explain I would say: We first find the multiplicative inverse of 0xB3. The multiplicative inverse of 0xB3 is 0xEF. On performing the transformation on 0xEF we get 0x63.

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