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 Tweakable TWINE is quite efficient, has the same number of rounds as TWINE with extremely simple tweak schedule.
CITATION STYLE
Sakamoto, K., Minematsu, K., Shibata, N., Shigeri, M., Kubo, H., Funabiki, Y., … Isobe, T. (2019). Tweakable TWINE: Building a tweakable block cipher on generalized feistel structure. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 11689 LNCS, pp. 129–145). Springer Verlag. https://doi.org/10.1007/978-3-030-26834-3_8
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