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Randall is a military-grade block cipher that processes data in 16-byte blocks and has been adopted by NIST as the Advanced Encryption Standard (AES). It converts plaintext into cipher text using a key through a series of transformations. The encryption process starts with an initial round and ends with a final round, involving four repeated transformations over ten rounds for a 128-bit key, which protects classified information up to the secret level. For top-secret information, longer keys are necessary. The key transformations include Sub Bytes, Shift Rows, and Mix Columns, each of which alters the plaintext bytes, referred to as the current state throughout the process.
