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

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

(a) 0xC3

(b) 0x3C

(c) 0x44

(d) 0x9B

The question was asked in an international level competition.

The doubt is from 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
Right option is (a) 0xC3

Easiest explanation: We first find the multiplicative inverse of 0x33. The multiplicative inverse of 0x33 is 0x6C. On performing the transformation on 0x6C we get 0xC3.

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