| Presentation | 1999/7/22 Security of E2 against Truncated Differential Cryptanalysis Shiho Moriai, Makoto Sugita, Kazumaro Aoki, Masayuki Kanda, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper studies the security offered by the block cipher E2 against truncated differential cryptanalysis. At FSE'99 Matsui and Tokita slowed a possible attack on an 8-round variant of E2 without IT- and FT-Functions based on byte characteristics. To evaluate the security against attacks using truncated differentials, or bytewise differentials, we searched truncated differentials that lead to possible attacks for reduced-round variants of E2. As a result, there exist no useful truncated differentials for reduced-roundvariants of E2 with more than 8 rotunds. Moreover, we found another possible attack on an 8-round variant of E2 without IT- or FT-Function with less complexity. We also found that it is possible to distinguish a 7-round variant of E2 with IT- and FT-Functions from a random permutation. In spite of our severe examination, this type of cryptanalysis fails to break tlae full E2. We believe that this means that the full E2 offers strong security against this truncated differential cryptanalysis. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | cryptanalysis / truncated differential / E2 / block cipher |
| Paper # | ISEC99-20 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 1999/7/22(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Security of E2 against Truncated Differential Cryptanalysis |
| Sub Title (in English) | |
| Keyword(1) | cryptanalysis |
| Keyword(2) | truncated differential |
| Keyword(3) | E2 |
| Keyword(4) | block cipher |
| 1st Author's Name | Shiho Moriai |
| 1st Author's Affiliation | NTT Information Sharing Platform Laboratories() |
| 2nd Author's Name | Makoto Sugita |
| 2nd Author's Affiliation | NTT Network Innovation Laboratories |
| 3rd Author's Name | Kazumaro Aoki |
| 3rd Author's Affiliation | NTT Information Sharing Platform Laboratories |
| 4th Author's Name | Masayuki Kanda |
| 4th Author's Affiliation | NTT Information Sharing Platform Laboratories |
| Date | 1999/7/22 |
| Paper # | ISEC99-20 |
| Volume (vol) | vol.99 |
| Number (no) | 208 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |