Rijndael Mix Columns
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 x4 + 1 with a fixed polynomial c(x) = 3x3 + x2 + x + 2; the inverse of this polynomial is c 1(x) = 11x3 + 13x2 + 9x + 14.In cryptography, the Advanced Encryption Standard (AES) is an encryption standard adopted by the U.S. government. The standard…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 x4 + 1 with a fixed polynomial c(x) = 3x3 + x2 + x + 2; the inverse of this polynomial is c 1(x) = 11x3 + 13x2 + 9x + 14.In cryptography, the Advanced Encryption Standard (AES) is an encryption standard adopted by the U.S. government. The standard comprises three block ciphers, AES-128, AES-192 and AES-256, adopted from a larger collection originally published as Rijndael. Each of these ciphers has a 128-bit block size, with key sizes of 128, 192 and 256 bits, respectively. The AES ciphers have been analyzed extensively and are now used worldwide, as was the case with its predecessor, the Data Encryption Standard (DES).