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Tweakable TWINE: Building a Tweakable Block Cipher on Generalized Feistel Structure Kosei SAKAMOTO Kazuhiko MINEMATSU Nao SHIBATA Maki SHIGERI Hiroyasu KUBO Yuki FUNABIKI Andrey BOGDANOV Sumio MORIOKA Takanori ISOBE Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Vol.E103-A No.12 pp.1629-1639 Publication Date: 2020/12/01 Online ISSN: 1745-1337 DOI: 10.1587/transfun.2019EAP1141 Type of Manuscript: PAPER Category: Cryptography and Information Security Keyword: twekakble block cipher, generalized feistel structure, TWINE, MILP, Full Text: PDF(3.7MB)>>
Summary: Tweakable block cipher (TBC) is an extension of conventional block cipher. We study how to build a TBC based on generalized Feistel structure (GFS), a classical block cipher construction. While known dedicated TBC proposals are based on substitution-permutation network (SPN), GFS has not been used for building TBC. In particular, we take 64-bit GFS block cipher TWINE and try to make it tweakable with a minimum change. To find a best one from a large number of candidates, we performed a comprehensive search with a help of mixed integer linear programming (MILP) solver. As a result, our proposal TWINE is quite efficient, has the same number of rounds as TWINE with extremely simple tweak schedule. | ||||||||||
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