!!! Overview
[{$pagename}] is a [Block Cipher] designed in [2003|Year 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.

[{$pagename}] [algorithm] uses a substitution-permutation network structure based on [AES]. The interface is the same as [AES]: 128-bit [block] size with key size of 128, 192, or 256 bits. The number of rounds is 12, 14, or 16, depending on the key size. [{$pagename}] 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".



!! More Information
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