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AES is short for Advanced Encryption Standard. It has two definitions: 1) The process in which the U.S. government (NIST) approves a cryptographic standard. 2) The winner of the latest U.S. government cryptographic testing. In this case, Rijndael won. It's a block cipher with a 128-bit block size. It uses a 128-bit, 192-bit or 256-bit key size and is considered to be extremely secure.
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