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Full AES Encrypt/Decrypt
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~1 min readKey Schedule & Full Cipher

Full AES Encrypt/Decrypt

Putting it together for AES-128 (10 rounds):

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Decryption applies inverse operations in reverse order:

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The encrypt/decrypt pair is the block cipher. It transforms 16 bytes ↔ 16 bytes given a 16-byte key.

For LARGER plaintexts, you need a mode of operation (next chapter).

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