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Paper Abstract and Keywords
Presentation 2015-03-04 11:15
A Multi-Party Optimistic Certified Email Protocol Using Verifiably Encrypted Signature Scheme For Line Topology
Hitoshi Miyazaki (Nagoya Inst. of Tech.), Masami Mohri (Gifu Univ.), Yoshiaki Shiraishi (Kobe Univ.) ICSS2014-86
Abstract (in Japanese) (See Japanese page) 
(in English) 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 n-participators are honest.
Keyword (in Japanese) (See Japanese page) 
(in English) fair exchange / certified email / verifiably encrypted signature scheme / multi-party protocol / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 489, ICSS2014-86, pp. 139-144, March 2015.
Paper # ICSS2014-86 
Date of Issue 2015-02-24 (ICSS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee ICSS  
Conference Date 2015-03-03 - 2015-03-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Meio Univiersity 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication Security, etc. 
Paper Information
Registration To ICSS 
Conference Code 2015-03-ICSS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Multi-Party Optimistic Certified Email Protocol Using Verifiably Encrypted Signature Scheme For Line Topology 
Sub Title (in English)  
Keyword(1) fair exchange  
Keyword(2) certified email  
Keyword(3) verifiably encrypted signature scheme  
Keyword(4) multi-party protocol  
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1st Author's Name Hitoshi Miyazaki  
1st Author's Affiliation Nagoya Institute of Technology (Nagoya Inst. of Tech.)
2nd Author's Name Masami Mohri  
2nd Author's Affiliation Gifu University (Gifu Univ.)
3rd Author's Name Yoshiaki Shiraishi  
3rd Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2015-03-04 11:15:00 
Presentation Time 25 minutes 
Registration for ICSS 
Paper # ICSS2014-86 
Volume (vol) vol.114 
Number (no) no.489 
Page pp.139-144 
#Pages 6 
Date of Issue 2015-02-24 (ICSS) 

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