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Advance Encryption Standard Advance Encryption Standard (Rijndael)The Advanced Encryption Standard (Rijndael) is a symmetric-key encryption standard. It encrypts a 128-bit plaintext into 128-bit cipher text using variable key either of 128 bits, 192 bits and 256 bits, this difference of key lengths in AES is referred to: AES-128, AES-192 and AES 256.[pic 1][pic 2][pic 3]Let,Plain.