| 講演名 | 2015-03-04 A Multi-Party Optimistic Certified Email Protocol Using Verifiably Encrypted Signature Scheme For Line Topology , |
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| PDFダウンロードページ |  PDFダウンロードページへ |
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| 抄録(英) | While many two-party fair exchange protocols have been proposed, more than three-party fair exchange protocol is required depending on a type of applications. Asokan et al. have proposed a multi-party fair exchange protocol for mesh topology. This scheme can be adapted to all kinds of topologies but requires much communication costs, which is 4n(n - 1) passes in the all n-participators honest case and 8n^2 - n - 10 passes in the worst case. In previous works, more efficient and multi-functional schemes specialized for a kind of topologies have been proposed but most of these are for ring topology and star topology. Zhou et al. have proposed an efficient multi-party contract signing protocol for line topology. It is shown the two protocols such that a simple protocol which is completed with 4(n - 1) passes in the all honest case and 5n - 3 passes in the worst case and an optimized protocol which is completed with 3(n - 1) passes in the all honest case and 4n - 2 passes in the worst. This result means that a fair exchange protocol for line topology is efficient in a number of communications nevertheless a certified email protocol specialized for line topology has not been proposed. That is, a certified email protocol run on line topology is only a protocol for mesh proposed by Asokan et al. adapted to line topology, therefore there is large room for reducing a number of communications by specializing for a certified email protocol. In this paper, we propose a multi-party certified email protocol for line topology. The proposed protocol has such basic properties of certified email as fairness, non-repudiation, trusted third party invisibility and timeliness, as same as the previous works. Our scheme is completed with 4(n - 1) passes in the all n-participators honest case and 5n - 3 passes in the worst. The communication cost is less than the Asokan et al.'s scheme with 4n(n - 1) passes even if the all w-participators are honest. |
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| キーワード(英) | fair exchange / certified email / verifiably encrypted signature scheme / multi-party protocol |
| 資料番号 | ICSS2014-86 |
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| 研究会 | ICSS |
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| 開催期間 | 2015/2/24(から1日開催) |
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| 申込み研究会 | Information and Communication System Security (ICSS) |
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| 本文の言語 | ENG |
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| タイトル（英） | A Multi-Party Optimistic Certified Email Protocol Using Verifiably Encrypted Signature Scheme For Line Topology |
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| キーワード(1)（和/英） | / fair exchange |
| 第 1 著者 氏名（和/英） | / Hitoshi MIYAZAKI |
| 第 1 著者 所属（和/英） | Nagoya Institute of Technology |
| 発表年月日 | 2015-03-04 |
| 資料番号 | ICSS2014-86 |
| 巻番号（vol） | vol.114 |
| 号番号（no） | 489 |
| ページ範囲 | pp.- |
| ページ数 | 6 |
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