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Kupyna is a cryptographic hash function defined in the Ukrainian national standard DSTU 7564:2014.〔http://jurliga.ligazakon.ua/news/2015/2/16/124401.htm Extension of national standards for cryptographic algorithms and protocols (in Russian)〕〔https://eprint.iacr.org/2015/885.pdf A New Standard of Ukraine: The Kupyna Hash Function〕 It was created to replace an obsolete GOST hash function defined in the old standard GOST 34.11-95, similar to Streebog hash function standardized in Russia. In addition to the hash function, the standard also describes message authentication code generation using Kupyna with digest sizes 256, 384 and 512 bits. ==Description== Kupyna hash function uses Davies-Meyer compression function based on Even-Mansour cipher. The compression function consists of two fixed permutations, T⊕ and T+, which are taken from the Kalyna block cipher〔https://eprint.iacr.org/2015/650.pdf A New Encryption Standard of Ukraine: The Kalyna Block Cipher〕 and consist of four operations: AddRoundConstant, SubBytes, ShiftBytes and MixColumns. The round function uses four different S-Boxes.〔https://github.com/Roman-Oliynykov/Kupyna-reference Reference implementation of the Kupyna hash function (DSTU 7564:2014)〕 The function can return a digest of arbitrary length from 8 to 512 bits; function which returns n-bit digest is called Kupyna-n. The recommended digest lengths are 256, 384 and 512 bits. The designers claim that differential and rebound attacks are ineffective after 4 rounds of the compression function.〔http://www.slideshare.net/oliynykov/kupyna Main properties of the new Ukrainian national standard on cryptographic hash function〕 ''Kupyna'' is Ukrainian name for Polygonatum odoratum. The plant is listed in The Red Book of Ukraine. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kupyna」の詳細全文を読む スポンサード リンク
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