Rijndael's MixColumns is a key operation in the AES (Advanced Encryption Standard) encryption algorithm, which is based on the Rijndael cipher. MixColumns is part of the "round" transformation processes that occur during both encryption and decryption. ### Overview of MixColumns The MixColumns operation transforms the columns of the state (the intermediate data structure representing the block of plaintext or ciphertext) using a mathematical mixing operation.
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