| Presentation | 2007-07-20 Analysis on the Key-Scheduling Algorithm of MICKEY Yoshiaki FUJIKAWA, Toshihiro OHIGASHI, Hidenori KUWAKADO, Masakatu MORII, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | MICKEY and MICKEY-128, which are stream ciphers submitted to the ECRYPT Stream Cipher Project(eSTREAM), use a 80-bit secret key and a 128-bit one, respectively. MICKEY and MICKEY-128 are candidates on Phase 3 of eSTREAM. However, no critical attack against MICKEY and MICKEY-128 have been proposed, and the security evaluation against them is continued now. In this paper, we study the one-wayness of the key-scheduling algorithm of MICKEY and MICKEY-128. We propose a method based on the meet-in-the-middle attack for recovering a secret key from a given initial state. The computational complexity of proposed method is less than the computational complexity of the brute force attack. We show that the computational complexity of recovering a secret key from a given initial state is about 2^<44> in MICKEY and about 2^<68> in MICKEY-128. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | stream cipher / eSTREAM / MICKEY / key-scheduling algorithm / one-wayness |
| Paper # | ISEC2007-46 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2007/7/13(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 | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Analysis on the Key-Scheduling Algorithm of MICKEY |
| Sub Title (in English) | |
| Keyword(1) | stream cipher |
| Keyword(2) | eSTREAM |
| Keyword(3) | MICKEY |
| Keyword(4) | key-scheduling algorithm |
| Keyword(5) | one-wayness |
| 1st Author's Name | Yoshiaki FUJIKAWA |
| 1st Author's Affiliation | Graduate School of Science and Technology, Kobe University() |
| 2nd Author's Name | Toshihiro OHIGASHI |
| 2nd Author's Affiliation | Graduate School of Science and Technology, Kobe University |
| 3rd Author's Name | Hidenori KUWAKADO |
| 3rd Author's Affiliation | Graduate School of Engineering, Kobe University |
| 4th Author's Name | Masakatu MORII |
| 4th Author's Affiliation | Graduate School of Engineering, Kobe University |
| Date | 2007-07-20 |
| Paper # | ISEC2007-46 |
| Volume (vol) | vol.107 |
| Number (no) | 141 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |