| Presentation | 2008-02-29 Security evaluation of Enocoro-128 ver.1.1 against resynchronization attack Kei KONOSU, Kenichiro MUTO, Hiroki FURUICHI, Dai WATANABE, Toshinobu KANEKO, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Enocoro is a pseudorandom number generator for a stream cipher proposed by Hitachi, Ltd at ISEC in September, 2007. In this paper, we evaluate the strength of a revised version of Enocoro-128 (Enocoro-128 ver.1.1), proposed at SCIS 2008, against resynchronization attack. We consider linear/differential characteristic as the correlation of IV and keystream, by evaluating maximum linear/differential characteristic probability by truncated linear/differential cryptanalysis. Using Viterbi algorithm, we search for the truncated path with minimum number of active sboxes as strength evaluation. As a result, the maximum linear characteristic probability of Enocoro-128 ver.1.1 is 2^<-216> and the maximum differential characteristic probability of Enocoro-128 ver.1.1 is 2^<-177.8>. Thus, it is shown that Enocoro-128 ver.1.1 has enough strength against linear/differential resynchronization attack. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Enocoro / Stream cipher / Resynchronization attack / Linear cryptanalysis / Differential cryptanalysis / Truncated cryptanalysis |
| Paper # | IT2007-50,ISEC2007-147,WBS2007-81 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2008/2/22(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | Security evaluation of Enocoro-128 ver.1.1 against resynchronization attack |
| Sub Title (in English) | |
| Keyword(1) | Enocoro |
| Keyword(2) | Stream cipher |
| Keyword(3) | Resynchronization attack |
| Keyword(4) | Linear cryptanalysis |
| Keyword(5) | Differential cryptanalysis |
| Keyword(6) | Truncated cryptanalysis |
| 1st Author's Name | Kei KONOSU |
| 1st Author's Affiliation | Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science() |
| 2nd Author's Name | Kenichiro MUTO |
| 2nd Author's Affiliation | Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science |
| 3rd Author's Name | Hiroki FURUICHI |
| 3rd Author's Affiliation | Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science |
| 4th Author's Name | Dai WATANABE |
| 4th Author's Affiliation | Systems Development Laboratory, Hitachi, Ltd. |
| 5th Author's Name | Toshinobu KANEKO |
| 5th Author's Affiliation | Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science |
| Date | 2008-02-29 |
| Paper # | IT2007-50,ISEC2007-147,WBS2007-81 |
| Volume (vol) | vol.107 |
| Number (no) | 501 |
| Page | pp.pp.- |
| #Pages | 7 |
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