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The Inverse S-box value for byte stored in cell (D,2)(a) 0x5F(b) 0x2D(c) 0x7F(d) 0x5DI got this question in an interview for internship.This interesting question is from Overview in division Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

Answer»

Right option is (c) 0X7F

Easy EXPLANATION: We FIRST find the MULTIPLICATIVE inverse of 0xD2. And then perform the matrix TRANSFORMATION to get 0x7F.



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