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| Presentation | 2009-05-26 10:40 Strengthening the Security of Distributed Oblivious Transfer Kai Yuen Cheong, Takeshi Koshiba, Shohei Nishiyama (Saitama Univ.)  COMP2009-11 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | We study the distributed oblivious transfer first proposed by Naor and Pinkas in ASIACRYPT 2000, and generalized by Blundo et al. originally in SAC 2002 and Nikov et al. in INDOCRYPT 2002. One major objective of distributed oblivious transfer is to achieve information theoretic security under specified conditions through the distribution of the functions of traditional oblivious transfer to a set of neutral parties. In this paper we revise the definition of distributed oblivious transfer in order to deal with stronger adversaries and clarify possible ambiguities. Under the new definition, we observe some impossibility results and derive the upper bounds for the system parameters (with respect to the size of coalition). The weak points of previously proposed schemes based on threshold secret sharing schemes using polynomial interpolation are reviewed and resolved. We generalize the results and prove that, by adjusting some technical details, a previous scheme proposed by Nikov et al. is unconditionally secure. This protocol is efficient and achieves the parameter bounds at the same time. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | oblivious transfer / secret sharing scheme / information theoretic security / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 109, no. 54, COMP2009-11, pp. 13-19, May 2009. | |
| Paper # | COMP2009-11 | |
| Date of Issue | 2009-05-19 (COMP) | |
| 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) | |
| Download PDF | COMP2009-11 |
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| Conference Information | |
| Committee | COMP |
| Conference Date | 2009-05-26 - 2009-05-26 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Saitama Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | COMP |
| Conference Code | 2009-05-COMP |
| Language | English |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Strengthening the Security of Distributed Oblivious Transfer |
| Sub Title (in English) | |
| Keyword(1) | oblivious transfer |
| Keyword(2) | secret sharing scheme |
| Keyword(3) | information theoretic security |
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| 1st Author's Name | Kai Yuen Cheong |
| 1st Author's Affiliation | Saitama University (Saitama Univ.) |
| 2nd Author's Name | Takeshi Koshiba |
| 2nd Author's Affiliation | Saitama University (Saitama Univ.) |
| 3rd Author's Name | Shohei Nishiyama |
| 3rd Author's Affiliation | Saitama University (Saitama Univ.) |
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| Speaker | Author-1 |
| Date Time | 2009-05-26 10:40:00 |
| Presentation Time | 35 minutes |
| Registration for | COMP |
| Paper # | COMP2009-11 |
| Volume (vol) | vol.109 |
| Number (no) | no.54 |
| Page | pp.13-19 |
| #Pages | 7 |
| Date of Issue | 2009-05-19 (COMP) |
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