| Presentation | 2021-03-04 Four-Block Type-2 Feistel Cipher from Tweakable Block Ciphers Kazuki Nakaya, Tetsu Iwata, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A secure block cipher can be obtained from tweakable block ciphers (TBCs). In this paper, by using a TBC with $n$-bit blocks and $n$-bit tweaks, which is relatively easy to design, we propose a construction of a block cipher based on Type-2 Feistel cipher that allows parallel execution of the underlying TBCs. For the obtained block cipher with $4n$-bit blocks, we present the provable security results with $r=4$ and $6$ rounds. We also show an attack that shows the upper bound of the provable security against the $4$-round construction. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Tweakable block cipher / Type-2 Feistel cipher / Chosen-ciphertext attack / Coefficient-H technique |
| Paper # | IT2020-118,ISEC2020-48,WBS2020-37 |
| Date of Issue | 2021-02-25 (IT, ISEC, WBS) |
| Conference Information | |
| Committee | WBS / IT / ISEC |
|---|---|
| Conference Date | 2021/3/4(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Joint Meeting of WBS, IT, and ISEC |
| Chair | Masanori Hamamura(Kochi Univ. of Tech.) / Tadashi Wadayama(Nagoya Inst. of Tech.) / Shoichi Hirose(Univ. of Fukui) |
| Vice Chair | Takashi Shono(INTEL) / Masahiro Fujii(Utsunomiya Univ.) / Tetsuya Kojima(Tokyo Kosen) / Tetsuya Izu(Fujitsu Labs.) / Noboru Kunihiro(Tsukuba Univ.) |
| Secretary | Takashi Shono(Okayama Univ. of Science) / Masahiro Fujii(National Defence Academy) / Tetsuya Kojima(Yamaguchi Univ.) / Tetsuya Izu(Saga Univ.) / Noboru Kunihiro(Tsukuba Univ.) |
| Assistant | Duong Quang Thang(NAIST) / Masafumi Moriyama(NICT) / Masayuki Kinoshita(Chiba Univ. of Tech.) / Takahiro Ohta(Senshu Univ.) / Kazuki Yoneyama(Ibaraki Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Wideband System / Technical Committee on Information Theory / Technical Committee on Information Security |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Four-Block Type-2 Feistel Cipher from Tweakable Block Ciphers |
| Sub Title (in English) | |
| Keyword(1) | Tweakable block cipher |
| Keyword(2) | Type-2 Feistel cipher |
| Keyword(3) | Chosen-ciphertext attack |
| Keyword(4) | Coefficient-H technique |
| 1st Author's Name | Kazuki Nakaya |
| 1st Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 2nd Author's Name | Tetsu Iwata |
| 2nd Author's Affiliation | Nagoya University(Nagoya Univ.) |
| Date | 2021-03-04 |
| Paper # | IT2020-118,ISEC2020-48,WBS2020-37 |
| Volume (vol) | vol.120 |
| Number (no) | IT-410,ISEC-411,WBS-412 |
| Page | pp.pp.37-44(IT), pp.37-44(ISEC), pp.37-44(WBS), |
| #Pages | 8 |
| Date of Issue | 2021-02-25 (IT, ISEC, WBS) |