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|Certification||South Korean standard|
|Key sizes||128, 192, or 256 bits|
|Block sizes||128 bits|
|Rounds||12, 14, or 16|
|Best public cryptanalysis|
|Meet-in-the-middle attack on 8 rounds with data complexity 256|
In cryptography, ARIA is a block cipher designed in 2003 by a large group of South Korean researchers. In 2004, the Korean Agency for Technology and Standards selected it as a standard cryptographic technique.
The algorithm uses a substitution-permutation network structure based on AES. The interface is the same as AES: 128-bit block size with key size of 128, 192, or 256 bits. The number of rounds is 12, 14, or 16, depending on the key size. ARIA uses two 8×8-bit S-boxes and their inverses in alternate rounds; one of these is the Rijndael S-box.