| Presentation | 2000/7/18 Differential Attack on CAST-256 Haruki SEKI, Toshinobu KANEKO, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | An block cipher CAST-256 based on CAST-128 was a candidate algorithm for the AES Round 1. In this paper we present a differential attack on CAST-256 reduced to 9 quad-rounds. One of the three round functions of CAST-256 has differential characteristics, which a non-zero inputxor result in a zero outputxor, with high probability. We also show that CAST-256 has weak keys with respect to differential attack. Thus CAST-256 reduced to 9 quad-rounds can be attacked using 2^<123> chosen plaintexts in the case of differentially weak keys. The time complexity is about 2^<100> encryptions. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Block cipher / CAST-256 / differential attack / AES |
| Paper # | ISEC2000-35 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2000/7/18(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) | Differential Attack on CAST-256 |
| Sub Title (in English) | |
| Keyword(1) | Block cipher |
| Keyword(2) | CAST-256 |
| Keyword(3) | differential attack |
| Keyword(4) | AES |
| 1st Author's Name | Haruki SEKI |
| 1st Author's Affiliation | Telecommunications Advancement Organization of Japan() |
| 2nd Author's Name | Toshinobu KANEKO |
| 2nd Author's Affiliation | Department of Electrical Engineering, Science University of TOKYO |
| Date | 2000/7/18 |
| Paper # | ISEC2000-35 |
| Volume (vol) | vol.100 |
| Number (no) | 213 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |