This work describes a refinement of this approach that minimizes the circuitry, and hence the chip area, required for the S-box. performs the 8-bit Galois field inversion of the S-box using subfields of 4 bits and of 2 bits. In particular, the most compact implementation to date of Satoh et al. A wide variety of implementations of AES have been proposed, for various desiderata, that effect the S-box in various ways. One key step in the Advanced Encryption Standard (AES), or Rijndael, algorithm is called the S-box, the only nonlinear step in each round of encryption/decryption.
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