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array of 16 bytes termed the state:

The key size used for an AES cipher specifies the number of transformation rounds that convert the input, called the plaintext, into the final output, called the ciphertext. The number of rounds are as follows:

* 10 rounds for 128-bit keys;
* 12 rounds for 192-bit keys;
* 14 rounds for 256-bit keys.

Each round consists of several processing steps, including one that depends on the encryption key itself.

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