| Presentation | 2021-03-04 Security analysis for the isogeny-based cryptography CSIDH Hayato Arai, Atsuko Miyaji, Kenta Kodera, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | CSIDH (Commutative Supersingular Isogeny Diffie Hellman) is a kind of post-quantum cryptography that uses isogenies to enable efficient key sharing. CSIDH uses a supersingular elliptic curve on a finite field whose characteristic is a prime number p satisfying certain conditions, and compute the elliptic curve of the image of l1^e1・・・ln^en-isogeny as a shared key. CSIDH is vulnerable to side-channel attacks because the execution time varies with the secret key, where (e1, ..en) is a secret key. There are two types of constant-time CSIDH: MCR and CCCDRS. It is said that the MCR method is weak against fault injection attacks, while the CCCDRS method is more resistant. In this study, we propose a method for the fault injection attack against the CCCDRS method. In addition, by considering the combination of the MCR and CCCDRS methods, we propose a CSIDH with the same speed as the CSIDH using the MCR method, but with a higher security level. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | post-quantum cryptography / isogeny-based cryptography / CSIDH / fault injection attack |
| Paper # | IT2020-123,ISEC2020-53,WBS2020-42 |
| 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) | Security analysis for the isogeny-based cryptography CSIDH |
| Sub Title (in English) | |
| Keyword(1) | post-quantum cryptography |
| Keyword(2) | isogeny-based cryptography |
| Keyword(3) | CSIDH |
| Keyword(4) | fault injection attack |
| 1st Author's Name | Hayato Arai |
| 1st Author's Affiliation | Osaka University(Osaka Univ.) |
| 2nd Author's Name | Atsuko Miyaji |
| 2nd Author's Affiliation | Osaka University(Osaka Univ.) |
| 3rd Author's Name | Kenta Kodera |
| 3rd Author's Affiliation | Osaka University(Osaka Univ.) |
| Date | 2021-03-04 |
| Paper # | IT2020-123,ISEC2020-53,WBS2020-42 |
| Volume (vol) | vol.120 |
| Number (no) | IT-410,ISEC-411,WBS-412 |
| Page | pp.pp.73-80(IT), pp.73-80(ISEC), pp.73-80(WBS), |
| #Pages | 8 |
| Date of Issue | 2021-02-25 (IT, ISEC, WBS) |