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.

ARIA 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.

The key schedule processes the key using a 3-round 256-bit Feistel Cipher, with the binary expansion of 1/π as a source of "nothing up my sleeve numbers".

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