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In the SubBytes step, each byte in the state is replaced with its entry in a fixed 8-bit lookup table, S; b ij = S(a ij). In the SubBytes step, each byte , in the state array is replaced with a SubByte (,) using an 8-bit substitution box. Before round 0, the state array is simply the plaintext/input.
The Rijndael S-box was specifically designed to be resistant to linear and differential cryptanalysis. This was done by minimizing the correlation between linear transformations of input/output bits, and at the same time minimizing the difference propagation probability.
The SubBytes operation applies a non-linear permutation (the S-box) to each byte of the state independently. The 8-bit S-box is composed of 3 smaller 4-bit S-boxes.
In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext, thus ensuring Shannon's property of confusion.
The Advanced Encryption Standard (AES), the symmetric block cipher ratified as a standard by National Institute of Standards and Technology of the United States (NIST), was chosen using a process lasting from 1997 to 2000 that was markedly more open and transparent than its predecessor, the Data Encryption Standard (DES).
General; Designers: Vincent Rijmen, Joan Daemen: First published: 1998: Derived from: Square: Successors: CRYPTON, Anubis, Grand Cru: Related to... Cipher detail; Key ...
The SubBytes transformation of the Advanced Encryption Standard is a notable [1] example of a bricklayer function: each 8-bit bundle of the 128-bit state is undergoing the same S-box transformation independently
SubBytes operation for AES: Date: 31 August 2006: Source: Own work: Author: Matt Crypto: SVG development . The SVG code is . This vector image was created with Inkscape.