| Presentation | 2003/9/12 A Study on Impossible Differential Cryptanalysis of Reduced Round Kohei YASUDA, Yasuo HATANO, Toshinobu KANEKO, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Encryption algorithm MISTY1 proposed by Matsui in 1996 in a symmetric block cipher with 64-bit block data and 128-bit secret key. Knudsen showed that 5-round Feistel type block cipher with bijective round function always has an impossible differential property. By using the property, Kuhn showed that 6-round MISTY1 without FL function can be attacked. Also, Kuhn insisted that 6-round MISTY1 including FL function cannot be attacked because it does not hold such property. In this paper, we show that the MISTY1 holds the 5-round impossible differential property by using an equivalent transformation for EL function. We propose a new attack of 6-round MISTY1 by using the equivalent transformation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Block Cipher / Impossible Differential / MISTY |
| Paper # | ISEC2003-56 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2003/9/12(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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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) | A Study on Impossible Differential Cryptanalysis of Reduced Round |
| Sub Title (in English) | |
| Keyword(1) | Block Cipher |
| Keyword(2) | Impossible Differential |
| Keyword(3) | MISTY |
| 1st Author's Name | Kohei YASUDA |
| 1st Author's Affiliation | Faculty of Science and Technology, Tokyo University of Science() |
| 2nd Author's Name | Yasuo HATANO |
| 2nd Author's Affiliation | Faculty of Science and Technology, Tokyo University of Science |
| 3rd Author's Name | Toshinobu KANEKO |
| 3rd Author's Affiliation | Faculty of Science and Technology, Tokyo University of Science |
| Date | 2003/9/12 |
| Paper # | ISEC2003-56 |
| Volume (vol) | vol.103 |
| Number (no) | 315 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |