Rijndael is a family of symmetric block-ciphers with block and keys sizes of 128, 160, 192, 224, or 256 bits.

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How can one improve Rijndael's with more efficient SBoxes?

Knowing that the Rijndael's SBox is a pre-calculation from a composition of two operations (an inversion in a polynomial field, and an affine transformation that can be saw as a product and an ...