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advanced encryption standards aes security algorithm data cryptography key secure aes256 aes128 aes192 block cipher symmetric length confidentiality integrity authentication decryption cryptographic nist expansion schedule ciphertext plaintext rijndael fips cryptanalysis brute force side channel attack strength software implementation hardware performance parallelization vulnerabilities counter mode galois gcm chaining cbc electronic codebook ecb padding initialization vector management public diffusion avalanche effect tag operation standard