Rijndael Mix Columns
The MixColumns operation performed by the Rijndael cipher, along with the shift-rows step, is the primary source of diffusion in Rijndael. Each column is treated as a polynomial over GF(28) and is then multiplied modulo with a fixed polynomial ; the inverse of this polynomial is .
Read more about Rijndael Mix Columns: MixColumns, Implementation Example, InverseMixColumns, Test Vectors For MixColumns; Not For InvMixColumns, Galois Multiplication Lookup Tables
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