| Presentation | 2021-03-04 Analysis of a new linear bias in the input/output difference of Salsa20 Ryo Watanabe, Atsuko Miyaji, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Among cryptographic techniques, Salsa20, a stream cipher, is the predecessor of ChaCha20, which was selected for TLS 1.3, and its security analysis is an important issue. In Salsa20, vulnerabilities are analyzed by Differential Analysis using the bias of specific input and output differences. In this study, we focus on the input/output difference of Salsa20 and experimentally find a new linear bias for multiple input and output difference. In addition, we theoretically analyze the occurrence probability of the new linear biases that we discovered, as well as some of the linear biases that had been discovered in existing studies. This will contribute to the construction of more secure cryptography by clarifying the structure of stream ciphers that lead to vulnerabilities. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Stream cipher / Salsa20 / Differential Analysis |
| Paper # | IT2020-120,ISEC2020-50,WBS2020-39 |
| Date of Issue | 2021-02-25 (IT, ISEC, WBS) |
| Conference Information | |
| Committee | WBS / IT / ISEC |
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| 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 |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Analysis of a new linear bias in the input/output difference of Salsa20 |
| Sub Title (in English) | |
| Keyword(1) | Stream cipher |
| Keyword(2) | Salsa20 |
| Keyword(3) | Differential Analysis |
| 1st Author's Name | Ryo Watanabe |
| 1st Author's Affiliation | Osaka University(Osaka Univ.) |
| 2nd Author's Name | Atsuko Miyaji |
| 2nd Author's Affiliation | Osaka University(Osaka Univ.) |
| Date | 2021-03-04 |
| Paper # | IT2020-120,ISEC2020-50,WBS2020-39 |
| Volume (vol) | vol.120 |
| Number (no) | IT-410,ISEC-411,WBS-412 |
| Page | pp.pp.52-57(IT), pp.52-57(ISEC), pp.52-57(WBS), |
| #Pages | 6 |
| Date of Issue | 2021-02-25 (IT, ISEC, WBS) |